{"id":1067,"date":"2025-05-21T20:27:05","date_gmt":"2025-05-21T12:27:05","guid":{"rendered":"https:\/\/www.hyy.net\/?p=1067"},"modified":"2025-05-21T20:27:05","modified_gmt":"2025-05-21T12:27:05","slug":"asp-net-core-razor-pages-in-action-6-%e4%bd%bf%e7%94%a8%e8%a1%a8%e5%8d%95%ef%bc%9a%e6%a0%87%e8%ae%b0%e8%be%85%e5%8a%a9%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/diji.net\/?p=1067","title":{"rendered":"ASP.NET Core Razor Pages in Action 6 \u4f7f\u7528\u8868\u5355\uff1a\u6807\u8bb0\u8f85\u52a9\u51fd\u6570"},"content":{"rendered":"

ASP.NET Core Razor Pages in Action 6 \u4f7f\u7528\u8868\u5355\uff1a\u6807\u8bb0\u8f85\u52a9\u51fd\u6570<\/p>\n

\u672c\u7ae0\u6db5\u76d6<\/h2>\n

\u2022 \u4f7f\u7528\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u6784\u5efa\u8868\u5355
\n\u2022 \u4f7f\u7528\u6570\u636e\u6ce8\u91ca\u63a7\u5236\u8f93\u5165\u7c7b\u578b
\n\u2022 \u4f7f\u7528\u670d\u52a1\u5668\u7aef\u4ee3\u7801\u586b\u5145\u9009\u62e9\u5217\u8868
\n\u2022 \u4f7f\u7528\u8868\u5355\u4e2d\u7684\u590d\u9009\u6846\u548c\u5355\u9009\u6309\u94ae
\n\u2022 \u5c06\u6587\u4ef6\u4e0a\u4f20\u5230\u670d\u52a1\u5668<\/p>\n

\u4e0a\u4e00\u7ae0\u4ecb\u7ecd\u4e86\u6a21\u578b\u7ed1\u5b9a\u5982\u4f55\u91c7\u7528\u8f93\u5165\u5e76\u5c06\u5176\u7ed1\u5b9a\u5230 Razor Pages \u4e2d\u7684\u5904\u7406\u7a0b\u5e8f\u53c2\u6570\u548c\u516c\u5171\u5c5e\u6027\u3002\u60a8\u4e86\u89e3\u4e86\u786e\u4fdd\u6210\u529f\u7ed1\u5b9a\u7684\u5173\u952e\u662f\u786e\u4fdd\u7ed1\u5b9a\u6e90\u7684\u540d\u79f0\u4e0e\u7ed1\u5b9a\u76ee\u6807\u7684\u540d\u79f0\u5339\u914d\u3002\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u60a8\u5df2\u7ecf\u624b\u52a8\u751f\u6210\u4e86\u8868\u5355\u63a7\u4ef6\u7684\u540d\u79f0\u3002\u8fd9\u79cd\u53ef\u80fd\u5bb9\u6613\u51fa\u9519\u7684\u65b9\u6cd5\u9664\u4e86\u5728 Request.Form \u96c6\u5408\u4e2d\u5bfb\u627e\u5df2\u53d1\u5e03\u7684\u503c\u4e4b\u5916\uff0c\u4e0d\u4f1a\u8ba9\u60a8\u611f\u5230\u56f0\u60d1\u3002<\/p>\n

\u5728 Razor Pages \u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u8868\u5355\u662f\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u5927\u653e\u5f02\u5f69\u7684\u5730\u65b9\u3002\u60a8\u5df2\u7ecf\u901a\u8fc7 validation \u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u770b\u5230\u4e86\u5b83\u4eec\u5728\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u9a8c\u8bc1\u4e2d\u7684\u89d2\u8272\u3002\u672c\u7ae0\u5c06\u63a2\u8ba8\u5982\u4f55\u751f\u6210\u8868\u5355\u4ee5\u4ece\u7528\u6237\u90a3\u91cc\u6536\u96c6\u6570\u636e\u5e76\u4f7f\u7528\u6a21\u578b\u7ed1\u5b9a\u7cfb\u7edf\u3002\u60a8\u5c06\u4e86\u89e3\u5982\u4f55\u4f7f\u7528\u5b83\u4eec\u6765\u786e\u4fdd\u63a7\u4ef6\u540d\u79f0\u4e0e\u7ed1\u5b9a\u76ee\u6807\u540d\u79f0\u987a\u5229\u5de5\u4f5c\u3002\u4ee5\u4e0b\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u53ef\u7528\u4e8e\u8868\u5355\u6784\u5efa\uff1a<\/p>\n

\u2022 Form
\n\u2022 Form action
\n\u2022 Label
\n\u2022 Input
\n\u2022 Select
\n\u2022 Option
\n\u2022 Textarea<\/p>\n

\u6bcf\u4e2a\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u90fd\u4ee5\u5b83\u547d\u540d\u7684 HTML \u5143\u7d20\u4e3a\u76ee\u6807\uff0c\u4f46\u8868\u5355\u4f5c\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u9664\u5916\uff0c\u8be5\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u4ee5 type \u5c5e\u6027\u8bbe\u7f6e\u4e3a submit \u6216 image \u7684\u6309\u94ae\u548c input \u5143\u7d20\u4e3a\u76ee\u6807\u3002<\/p>\n

\u672c\u7ae0\u9996\u5148\u4ecb\u7ecd form \u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\uff0c\u4ee5\u5e2e\u52a9\u60a8\u4e86\u89e3\u5176\u89d2\u8272\u5e76\u5bf9\u5176\u8fdb\u884c\u914d\u7f6e\u3002\u6211\u4eec\u5c06\u5e7f\u6cdb\u7814\u7a76 input tag helper \u5e76\u5b66\u4e60\u5982\u4f55\u6839\u636e\u7ed1\u5b9a\u76ee\u6807\u6570\u636e\u7c7b\u578b\u63a7\u5236\u5b83\u5448\u73b0\u7684\u8f93\u5165\u7c7b\u578b\uff0c\u4ee5\u53ca\u5982\u4f55\u5728\u9700\u8981\u65f6\u4f7f\u7528\u6570\u636e\u6ce8\u91ca\u5c5e\u6027\u6765\u5fae\u8c03\u5185\u5bb9\u3002<\/p>\n

\u5728\u6280\u672f\u793e\u533a\u652f\u6301\u7ad9\u70b9\u548c\u8bba\u575b\u4e0a\uff0c\u9009\u62e9\u5217\u8868\u3001\u590d\u9009\u6846\u548c\u5355\u9009\u6309\u94ae\u4f3c\u4e4e\u4f1a\u5f15\u53d1\u5927\u591a\u6570\u4e0e\u8868\u5355\u76f8\u5173\u7684\u95ee\u9898\uff0c\u56e0\u6b64\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528\u5b83\u4eec\u7684\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u3002\u6700\u540e\uff0c\u6211\u4eec\u5c06\u7814\u7a76\u4f7f\u7528\u8868\u5355\u4e0a\u4f20\u6587\u4ef6\u3002<\/p>\n

6.1 \u8868\u5355\u548c\u8868\u5355\u4f5c\u6807\u7b7e\u8f85\u52a9\u51fd\u6570
\n\u8868\u5355\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u4ee5 HTML \u8868\u5355\u5143\u7d20\u4e3a\u76ee\u6807\uff0c\u5177\u6709\u4e24\u4e2a\u4e3b\u8981\u804c\u8d23\u3002\u5b83\u786e\u4fdd\u8bf7\u6c42\u9a8c\u8bc1\u4ee4\u724c\u5305\u542b\u5728\u5176\u65b9\u6cd5\u8bbe\u7f6e\u4e3a post \u7684\u6bcf\u4e2a\u8868\u5355\u7684\u9690\u85cf\u5b57\u6bb5\u4e2d\u3002\u5b83\u8fd8\u4f1a\u6839\u636e\u60a8\u63d0\u4f9b\u7ed9\u8868\u5355\u81ea\u5b9a\u4e49\u5c5e\u6027\u7684\u503c\u751f\u6210\u8868\u5355\u7684 action \u5c5e\u6027\u7684 URL\u3002<\/p>\n

\u8868\u5355\u4f5c\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u4ee5\u6309\u94ae\u548c\u8f93\u5165\u4e3a\u76ee\u6807\uff0c\u5176 type \u5c5e\u6027\u8bbe\u7f6e\u4e3a submit \u6216 image\u3002\u5b83\u7684\u4f5c\u7528\u662f\u8bbe\u7f6e\u8fd9\u4e9b\u5143\u7d20\u4e0a\u7684 formaction \u5c5e\u6027\u7684 URL\uff0c\u8be5 URL \u6307\u5b9a\u8868\u5355\u5e94\u63d0\u4ea4\u5230\u7684\u4f4d\u7f6e\u3002\u56e0\u6b64\uff0c\u5b83\u4f1a\u8986\u76d6\u8868\u5355\u7684 action \u5c5e\u6027\u3002<\/p>\n

\u63a5\u4e0b\u6765\uff0c\u5f53\u6211\u5728\u6587\u672c\u4e2d\u5f15\u7528\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7684\u81ea\u5b9a\u4e49\u5c5e\u6027\u65f6\uff0c\u6211\u5c06\u7701\u7565 asp- \u524d\u7f00\u3002\u8bf7\u8bb0\u4f4f\uff0c\u6240\u6709\u6846\u67b6\u5c5e\u6027\u90fd\u4ee5 asp- \u4e3a\u524d\u7f00\u3002\u8868\u5355\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u548c\u8868\u5355\u4f5c\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u4e0a\u53ef\u7528\u7684\u751f\u6210 URL \u7684\u81ea\u5b9a\u4e49\u5c5e\u6027\u4e0e\u6211\u5728\u7b2c 4 \u7ae0\u4e2d\u8be6\u7ec6\u4ecb\u7ecd\u7684\u951a\u70b9\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u4e0a\u7684\u81ea\u5b9a\u4e49\u5c5e\u6027\u76f8\u540c\uff0c\u5e76\u4e14\u5b83\u4eec\u4ee5\u76f8\u540c\u7684\u65b9\u5f0f\u6839\u636e\u5e94\u7528\u7a0b\u5e8f\u7684\u8def\u7531\u914d\u7f6e\u6784\u9020\u503c\uff1a<\/p>\n

\u2022 page
\n\u2022 page-handler
\n\u2022 route-*
\n\u2022 all-route-data
\n\u2022 host
\n\u2022 protocol
\n\u2022 area<\/p>\n

\u5982\u679c\u5728\u8868\u5355\u5143\u7d20\u4e2d\u5305\u542b action \u5c5e\u6027\u4ee5\u53ca\u8fd9\u4e9b\u81ea\u5b9a\u4e49\u8def\u7531\u5c5e\u6027\u4e2d\u7684\u4efb\u4f55\u4e00\u4e2a\uff0c\u5219\u6846\u67b6\u5c06\u5f15\u53d1\u9519\u8bef\u3002\u8868\u5355\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u4f7f\u7528\u4f20\u9012\u7ed9\u8fd9\u4e9b\u81ea\u5b9a\u4e49\u5c5e\u6027\u7684\u503c\u6765\u751f\u6210 action \u5c5e\u6027\uff0c\u7c7b\u4f3c\u4e8e\u951a\u70b9\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u4ece\u76f8\u540c\u7684\u81ea\u5b9a\u4e49\u8def\u7531\u5c5e\u6027\u751f\u6210 href \u5c5e\u6027\u7684\u65b9\u5f0f\u3002\u60a8\u53ef\u4ee5\u81ea\u5df1\u901a\u8fc7 action \u5c5e\u6027\u663e\u5f0f\u8bbe\u7f6e URL\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u5c5e\u6027\u6765\u914d\u7f6e URL\u3002\u4f46\u4f60\u4e0d\u80fd\u4e24\u8005\u517c\u5f97\u3002\u5982\u679c\u60a8\u4e0d\u5305\u542b action \u5c5e\u6027\u6216\u4efb\u4f55\u81ea\u5b9a\u4e49\u8def\u7531\u5c5e\u6027\uff0c\u5219\u8868\u5355\u5c06\u63d0\u4ea4\u5230\u5f53\u524d\u9875\u9762\u7684 URL\u3002\u5bf9\u4e8e\u7edd\u5927\u591a\u6570 CRUD \u60c5\u51b5\uff0c\u8fd9\u5f88\u53ef\u80fd\u662f\u60a8\u8981\u6267\u884c\u7684\u4f5c\uff0c\u60a8\u5c06\u5728\u751f\u6210\u8868\u5355\u7684\u540c\u4e00\u9875\u9762\u7684 OnPost \u5904\u7406\u7a0b\u5e8f\u4e2d\u5904\u7406\u63d0\u4ea4\u3002\u5f53\u5904\u7406\u9875\u9762\u662f\u4e0d\u540c\u7684\u9875\u9762\u6216\u5728\u547d\u540d\u5904\u7406\u7a0b\u5e8f\u4e2d\u5904\u7406\u8868\u5355\u65f6\uff0c\u60a8\u901a\u5e38\u4f1a\u4f7f\u7528 tag helper \u5c5e\u6027\u6765\u8bbe\u7f6e\u8868\u5355\u7684\u4f5c\u3002\u4f8b\u5982\uff0c\u5f53\u6211\u4eec\u5728\u7b2c 3 \u7ae0\u4e2d\u4ecb\u7ecd\u547d\u540d\u5904\u7406\u7a0b\u5e8f\u65f6\uff0c\u60a8\u5df2\u7ecf\u770b\u5230\u4e86\u60a8\u53ef\u80fd\u5e0c\u671b\u8bbe\u7f6e\u9875\u9762\u5904\u7406\u7a0b\u5e8f\u540d\u79f0\u7684\u4f4d\u7f6e\uff1a<\/p>\n

<form method="post" asp-page-handler="Search"><\/code><\/pre>\n
\u8868\u5355\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u652f\u6301\u4e00\u4e2a\u989d\u5916\u7684\u81ea\u5b9a\u4e49\u5c5e\u6027\uff1a\u9632\u4f2a\u3002\u8fd9\u9700\u8981\u4e00\u4e2a Boolean \u503c\u6765\u63a7\u5236\u662f\u5426\u5448\u73b0\u8bf7\u6c42\u9a8c\u8bc1\u4ee4\u724c\uff0c\u56e0\u6b64\u5b83\u4e3a\u60a8\u63d0\u4f9b\u4e86\u4e00\u79cd\u6709\u9009\u62e9\u5730\u9010\u4e2a\u8868\u5355\u7981\u7528\u8bf7\u6c42\u9a8c\u8bc1\u7684\u65b9\u6cd5\u3002\u5982\u679c\u7701\u7565\u8be5\u5c5e\u6027\uff0c\u5219\u8be5\u503c\u9ed8\u8ba4\u4e3a true\u3002\u56de\u60f3\u4e00\u4e0b\u6211\u4eec\u5728\u7b2c 3 \u7ae0\u4e2d\u4ecb\u7ecd\u7684\u547d\u540d\u5904\u7406\u7a0b\u5e8f\u7684\u4f8b\u5b50\uff0c\u6e05\u5355 3.32 \u4e2d\u7684\u641c\u7d22\u8868\u5355\u53ef\u4ee5\u7f16\u5199\u4e3a\u4f7f\u7528\u8868\u5355\u4f5c\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\uff0c\u800c\u4e0d\u662f\u901a\u8fc7\u8868\u5355\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u8bbe\u7f6e\u63d0\u4ea4 URL\u3002\u4e0b\u9762\u7684\u6e05\u5355\u6f14\u793a\u4e86\u5982\u4f55\u4f7f\u7528 page-handler \u5c5e\u6027\u5728\u6e32\u67d3\u7684\u6309\u94ae\u4e2d\u751f\u6210 formaction \u5c5e\u6027\u3002<\/p>\n
\u6e05\u5355 6.1 \u8868\u5355\u52a8\u4f5c\u6807\u7b7e\u52a9\u624b<\/p>\n
<form method="post">    \n    <p>Search<\/p>\n    <input name="searchTerm" \/>    \n    <button asp-page-handler="Search">Search<\/button>   \u2776\n<\/form><\/code><\/pre>\n
\u2776 page-handler \u5c5e\u6027\u88ab\u5e94\u7528\u4e8e\u6309\u94ae\uff0c\u5bfc\u81f4 formaction \u5c5e\u6027\u88ab\u6e32\u67d3\u5230\u6d4f\u89c8\u5668\u3002<\/p>\n
6.2 \u8f93\u5165\u548c\u6807\u7b7e\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f<\/h2>\n
\u5728\u4e0a\u4e00\u7ae0\u4e2d\uff0c\u60a8\u4ece\u5c06\u8868\u5355\u5b57\u6bb5\u63a7\u4ef6\u7684\u540d\u79f0\u6620\u5c04\u5230 Form \u548c Query \u96c6\u5408\u4e2d\u7684\u952e\u8fd9\u4e00\u53ef\u80fd\u5bb9\u6613\u51fa\u9519\u7684\u505a\u6cd5\uff0c\u53d1\u5c55\u5230\u7ed1\u5b9a\u5230\u7531\u4e8e\u5e94\u7528\u4e86 BindProperty \u5c5e\u6027\u800c\u88ab\u663e\u5f0f\u6807\u8bb0\u4e3a\u7ed1\u5b9a\u76ee\u6807\u7684\u516c\u5171\u5c5e\u6027\u3002\u4f46\u60a8\u4ecd\u7136\u6709\u51fa\u9519\u7684\u4f59\u5730\uff0c\u56e0\u4e3a\u63a7\u4ef6\u7684 name \u5c5e\u6027\u7684\u503c\u5fc5\u987b\u4e0e\u76ee\u6807 PageModel \u5c5e\u6027\u7684 name \u5339\u914d\u3002\u56de\u60f3\u4e00\u4e0b\u57ce\u5e02\u7684 Create \u9875\u9762\u4e2d\u8868\u5355\u7684 HTML\uff0c\u5728\u8be5\u9875\u9762\u4e2d\uff0c\u60a8\u5c06\u5b57\u7b26\u4e32 \u201ccityName\u201d \u5206\u914d\u7ed9 name \u5c5e\u6027\uff1a<\/p>\n
<input class="form-control" type="text" name="cityName" \/><\/code><\/pre>\n
\u5982\u524d\u6240\u8ff0\uff0c\u60a8\u4e0d\u80fd\u4f9d\u8d56\u5b57\u7b26\u4e32\u5339\u914d\u3002\u5bf9\u5176\u4e2d\u4e00\u4e2a\u6216\u53e6\u4e00\u4e2a\u7684\u66f4\u6539\u53ea\u4f1a\u5bfc\u81f4\u8fd0\u884c\u65f6\u51fa\u9519\u3002\u7531\u4e8e\u5c5e\u6027\u53ef\u5728 Razor \u9875\u9762\u4e2d\u8bbf\u95ee\uff0c\u56e0\u6b64\u53ef\u4ee5\u76f4\u63a5\u5728 Razor \u4ee3\u7801\u4e2d\u4f7f\u7528 nameof \u8868\u8fbe\u5f0f\uff0c\u4ee5\u786e\u4fdd\u4e3a\u8868\u5355\u63a7\u4ef6\u7684 name \u5c5e\u6027\u751f\u6210\u7684\u503c\u4e0e\u5c5e\u6027\u540d\u79f0\u5339\u914d\uff1a<\/p>\n
<input name="@nameof(Model.CityName)" type="text" \/><\/code><\/pre>\n
\u4f46\u662f\uff0c\u4f7f\u7528 input tag helper \u53ef\u4ee5\u4ee5\u66f4\u5c11\u7684\u4eea\u5f0f\u5b9e\u73b0\u7c7b\u4f3c\u7684\u6548\u679c\uff0c\u5e76\u63d0\u4f9b\u66f4\u591a\u7684\u6536\u76ca\u3002\u5b83\u6709\u4e00\u4e2a for \u5c5e\u6027\uff0c\u8be5\u5c5e\u6027\u91c7\u7528 PageModel \u5c5e\u6027\u7684\u540d\u79f0\uff0c\u5e76\u6709\u6548\u5730\u5c06\u8be5\u5c5e\u6027\u7ed1\u5b9a\u5230\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\uff0c\u4ece\u800c\u5728\u5448\u73b0\u7684 HTML \u4e2d\u4e3a\u8868\u5355\u63a7\u4ef6\u751f\u6210 name \u548c id \u5c5e\u6027\u3002input \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u8fd8\u5c06\u5448\u73b0 type \u5c5e\u6027\uff0c\u6839\u636e bound \u5c5e\u6027\u7684\u6570\u636e\u7c7b\u578b\u5c06\u5176\u503c\u8bbe\u7f6e\u4e3a\u5408\u9002\u7684\u503c\uff0c\u56e0\u6b64\u60a8\u4e5f\u4e0d\u9700\u8981\u5c06\u5176\u5305\u542b\u5728\u6807\u8bb0\u4e2d\u3002\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u8fd8\u5448\u73b0\u4e00\u4e2a value \u5c5e\u6027\uff0c\u8be5\u5c5e\u6027\u88ab\u8bbe\u7f6e\u4e3a\u5206\u914d\u7ed9\u8be5\u5c5e\u6027\u7684\u503c\u3002\u4ee5\u4e0b\u7b80\u5355\u4ee3\u7801\u662f\u751f\u6210\u5b8c\u5168\u8fde\u63a5 input \u5143\u7d20\u6240\u9700\u7684\u5168\u90e8\u4ee3\u7801\uff1a<\/p>\n
<input asp-for="CityName" \/><\/code><\/pre>\n
\u4e0a\u9762\u4e00\u884c\u7684\u6e32\u67d3\u8f93\u51fa\u662f<\/p>\n
<input type="text" id="CityName" name="CityName" value="" \/><\/code><\/pre>\n
\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u4f60\u53ef\u4ee5\u5728\u8868\u5355\u63a7\u4ef6\u548c\u516c\u5171 PageModel \u5c5e\u6027\u4e4b\u95f4\uff0c\u6216\u8005\u7ed1\u5b9a\u6e90\u548c\u5b83\u7684\u76ee\u6807\u4e4b\u95f4\u5b9e\u73b0\u4e00\u79cd\u53cc\u5411\u7ed1\u5b9a\uff08\u56fe 6.1\uff09\u3002<\/p>\n
<\/p>\n
\u56fe 6.1 \u4f7f\u7528\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u5b9e\u73b0\u7ed1\u5b9a\u6e90\u4e0e\u5176\u76ee\u6807\u4e4b\u95f4\u7684\u53cc\u5411\u7ed1\u5b9a\u3002<\/p>\n
Create City \u9875\u9762\u4e2d\u7684\u73b0\u6709 label \u5143\u7d20\u53ef\u4ee5\u66ff\u6362\u4e3a tag \u5e2e\u52a9\u7a0b\u5e8f\u3002\u5f53\u524d HTML for \u5c5e\u6027\u9700\u8981\u4ee5 asp- \u4e3a\u524d\u7f00\u624d\u80fd\u6fc0\u6d3b\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u3002\u5c31\u50cf input \u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u4e00\u6837\uff0c\u4f20\u9012\u7ed9 for \u5c5e\u6027\u7684\u503c\u5e94\u8be5\u662f model \u5c5e\u6027\u7684\u540d\u79f0\uff1a<\/p>\n
<label asp-for="CityName"><\/label><\/code><\/pre>\n
\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u6807\u7b7e\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u4e3a\u7a7a\u3002\u5b83\u6ca1\u6709\u5185\u5bb9\u3002\u5f53\u50cf\u8fd9\u6837\u4f7f\u7528\u65f6\uff0c\u5c5e\u6027\u540d\u79f0\u5c06\u5728\u6807\u7b7e\u4e2d\u5448\u73b0\uff1a<\/p>\n
<label for="CityName">CityName<\/label><\/code><\/pre>\n
\u4f60\u53ef\u4ee5\u901a\u8fc7\u5c06\u6587\u672c\u6dfb\u52a0\u5230\u6807\u7b7e\u7684\u5185\u5bb9\u6216\u4f7f\u7528 data annotation \u5c5e\u6027\u6765\u8986\u76d6\u5b83\uff0c\u6211\u4eec\u7a0d\u540e\u5c06\u4ecb\u7ecd\u8be5\u5c5e\u6027\u3002<\/p>\n
\u56e0\u6b64\uff0c\u603b\u800c\u8a00\u4e4b\uff0c\u5728\u8868\u5355\u4e2d\u4f7f\u7528\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7684\u597d\u5904\u662f\uff0c\u60a8\u53ef\u4ee5\u5728\u670d\u52a1\u5668\u4ee3\u7801\u4e2d\u7684\u5c5e\u6027\u548c\u5448\u73b0\u7ed9\u6d4f\u89c8\u5668\u7684\u8868\u5355\u63a7\u4ef6\u4e4b\u95f4\u5efa\u7acb\u53cc\u5411\u7ed1\u5b9a\u5173\u7cfb\u3002\u5982\u679c\u5728\u8868\u5355\u4e2d\u66f4\u65b0\u4e86\u8be5\u503c\uff0c\u5219\u5728\u63d0\u4ea4\u65f6\uff0c\u8be5\u66f4\u65b0\u5c06\u81ea\u52a8\u5e94\u7528\u4e8e\u670d\u52a1\u5668\u3002\u540c\u6837\uff0c\u5982\u679c\u66f4\u6539\u670d\u52a1\u5668\u4e0a\u7684\u503c\uff0c\u5219\u5448\u73b0\u7684\u8868\u5355\u63a7\u4ef6\u5c06\u81ea\u52a8\u53cd\u6620\u8fd9\u4e9b\u66f4\u6539\u3002<\/p>\n
6.2.1 \u4e86\u89e3\u8f93\u5165\u7c7b\u578b<\/h3>\n
\u73b0\u5728\uff0c\u60a8\u5df2\u7ecf\u4e86\u89e3\u4e86\u5728\u8868\u5355\u4e2d\u4f7f\u7528\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7684\u597d\u5904\uff0c\u662f\u65f6\u5019\u8003\u8651\u786e\u4fdd\u5448\u73b0\u6b63\u786e\u7c7b\u578b\u7684\u8f93\u5165\u7684\u65b9\u6cd5\u4e86\u3002\u9996\u5148\uff0c\u6211\u4eec\u5c06\u4e86\u89e3 .NET \u548c HTML \u7c7b\u578b\u4e4b\u95f4\u7684\u9ed8\u8ba4\u6620\u5c04\u3002HTML 5 \u5728\u73b0\u6709\u9009\u9879\uff08\u5305\u62ec checkbox\u3001radio\u3001file \u7b49\uff09\u7684\u57fa\u7840\u4e0a\uff0c\u6dfb\u52a0\u4e86\u5bf9\u4e0d\u540c\u7c7b\u578b\u6570\u636e\uff08\u6570\u5b57\u3001\u65e5\u671f\u65f6\u95f4-\u672c\u5730\u65f6\u95f4\u3001\u5468\u548c\u8303\u56f4\uff09\u7684\u65b0\u8f93\u5165\u7c7b\u578b\u96c6\u5408\u7684\u652f\u6301\u3002\u67d0\u4e9b HTML 5 \u8f93\u5165\u7c7b\u578b\u5728\u6d4f\u89c8\u5668\u4e0a\u4ec5\u4eab\u6709\u6709\u9650\u7684\u652f\u6301\uff0c\u4f46\u5728\u53ef\u4ee5\u7684\u60c5\u51b5\u4e0b\uff0c\u60a8\u5e94\u8be5\u5728\u4f7f\u7528\u63d0\u4f9b\u7c7b\u4f3c\u529f\u80fd\u7684\u7b2c\u4e09\u65b9\u5e93\uff08\u4f8b\u5982\uff0c\u65e5\u671f\u9009\u62e9\u5668\uff09\u4e4b\u524d\u4f7f\u7528\u5b83\u4eec\u3002<\/p>\n
\u901a\u5e38\uff0c\u60a8\u53ef\u4ee5\u4f9d\u9760 Razor Pages \u4ec5\u6839\u636e\u7ed1\u5b9a\u5230\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7684\u5c5e\u6027\u6570\u636e\u7c7b\u578b\u751f\u6210\u6b63\u786e\u7684\u7c7b\u578b\u3002\u8868 6.1 \u63d0\u4f9b\u4e86\u6709\u5173\u8f93\u5165\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u4e3a\u6307\u5b9a .NET \u6570\u636e\u7c7b\u578b\u7684 HTML type \u5c5e\u6027\u751f\u6210\u54ea\u4e2a\u503c\u7684\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n
\u8868 6.1 .NET \u6570\u636e\u7c7b\u578b\u4e0e\u8f93\u5165\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u751f\u6210\u7684 type \u5c5e\u6027\u4e4b\u95f4\u7684\u6620\u5c04<\/p>\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n\n
\n
<\/a>.NET type<\/p>\n<\/th>\n
\n
<\/a>HTML input type<\/p>\n<\/th>\n<\/tr>\n
\n
<\/a>string<\/span><\/p>\n<\/td>\n
\n
<\/a>text<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
<\/a>bool<\/span><\/a><\/p>\n<\/td>\n
\n
<\/a>checkbox<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
<\/a>int, byte, short, long<\/span><\/p>\n<\/td>\n
\n
<\/a>number<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
<\/a>decimal, double, float<\/span><\/a><\/p>\n<\/td>\n
\n
<\/a>text<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
<\/a>DateTime<\/span><\/a><\/p>\n<\/td>\n
\n
<\/a>datetime-local<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
<\/a>IFormFile<\/span><\/p>\n<\/td>\n
\n
<\/a>file<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u8981\u5bf9\u6b64\u8fdb\u884c\u6d4b\u8bd5\uff0c\u8bf7\u5c06\u540d\u4e3a PropertyManager \u7684\u65b0\u6587\u4ef6\u5939\u6dfb\u52a0\u5230 Pages \u6587\u4ef6\u5939\u3002\u8fd9\u5c06\u5305\u542b\u7528\u4e8e\u7ba1\u7406\u7f51\u7ad9\u4e0a\u53ef\u7528\u7684\u51fa\u79df\u7269\u4e1a\u8be6\u7ec6\u4fe1\u606f\u7684\u9875\u9762\u3002\u7136\u540e\u6dfb\u52a0\u540d\u4e3a Create.cshtml \u7684\u65b0 Razor \u9875\u9762\u3002\u5c06\u4ee5\u4e0b\u516c\u5171\u5c5e\u6027\u6dfb\u52a0\u5230 PageModel \u4e2d\uff0c\u8868\u793a\u6709\u5173\u5141\u8bb8\u7528\u6237\u4f7f\u7528\u4e00\u7cfb\u5217 .NET \u7c7b\u578b\u7684\u79df\u8d41\u5c5e\u6027\u7684\u4fe1\u606f\u3002<\/p>\n
\u6e05\u5355 6.2 Property Manager \u7684 CreateModel<\/p>\n
public class CreateModel : PageModel\n{\n    [BindProperty]\n    public string Name { get; set; }\n    [BindProperty]\n    public int MaxNumberOfGuests { get; set; }\n    [BindProperty]\n    public decimal DayRate { get; set; }\n    [BindProperty]\n    public bool SmokingPermitted { get; set; }\n    [BindProperty]\n    public DateTime AvailableFrom { get; set; }\n}<\/code><\/pre>\n
\u63a5\u4e0b\u6765\uff0c\u5c06 Create.cshtml \u6587\u4ef6\u66f4\u6539\u4e3a\u5305\u542b\u8868\u5355\uff0c\u5bf9\u6bcf\u4e2a PageModel \u5c5e\u6027\u4f7f\u7528\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\uff0c\u4f7f\u4ee3\u7801\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
\u6e05\u5355 6.3 Create Property \u9875\u9762\u7684\u8868\u5355\uff0c\u4f7f\u7528\u6807\u7b7e\u52a9\u624b<\/p>\n
@page\n@model CityBreaks.Pages.PropertyManager.CreateModel\n@{\n    ViewData["Title"] = "Create Property";\n}\n\n<form method="post">\n    <div class="mb-3">\n        <label class="form-label" asp-for="Name"><\/label>\n        <input class="form-control" asp-for="Name" \/>\n    <\/div>\n    <div class="mb-3">\n        <label class="form-label" asp-for="MaxNumberOfGuests"><\/label>\n        <input class="form-control" asp-for="MaxNumberOfGuests" \/>\n    <\/div>\n    <div class="mb-3">\n        <label class="form-label" asp-for="DayRate"><\/label>\n        <input class="form-control" asp-for="DayRate" \/>\n    <\/div>\n    <div class="mb-3">\n        <label class="form-label" asp-for="AvailableFrom"><\/label>\n        <input class="form-control" asp-for="AvailableFrom" \/>\n    <\/div>\n    <div class="mb-3">\n        <label asp-for="SmokingPermitted"><\/label>\n        <input asp-for="SmokingPermitted" \/>\n    <\/div>\n    <div class="mb-3">\n        <button class="btn btn-primary">Submit<\/button>\n    <\/div>\n<\/form><\/code><\/pre>\n
\u9664\u4e86\u7528\u4e8e\u8868\u793a\u7684 Bootstrap \u7c7b\u4e4b\u5916\uff0c\u8be5\u8868\u5355\u8fd8\u7531\u4e00\u7cfb\u5217\u6807\u7b7e\u548c\u8f93\u5165\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7ec4\u6210\uff0c\u8fd9\u4e9b\u6807\u8bb0\u8868\u793a PageModel \u4e2d\u7684\u6bcf\u4e2a\u5c5e\u6027\u3002\u5f53\u60a8\u5bfc\u822a\u5230 \/property-manager\/create \u65f6\uff0c\u60a8\u5e94\u8be5\u4f1a\u770b\u5230\u7c7b\u4f3c\u4e8e\u56fe 6.2 \u7684\u5185\u5bb9\u3002<\/p>\n
<\/p>\n
\u56fe 6.2 \u201cCreate Property\u201d\uff08\u521b\u5efa\u5c5e\u6027\uff09\u9875\u9762\u7684\u5448\u73b0\u8868\u5355<\/p>\n
label \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u5df2\u5448\u73b0\u5c5e\u6027\u7684\u540d\u79f0\uff0c\u5e76\u4e14\u6b64\u503c\u4e5f\u5df2\u5206\u914d\u7ed9\u5448\u73b0\u7684\u6807\u7b7e\u7684 for \u5c5e\u6027\u3002\u5176\u4e2d\u4e00\u4e9b\u6807\u7b7e\u503c\u4e0d\u662f\u7279\u522b\u7528\u6237\u53cb\u597d\u3002\u6211\u4eec\u7a0d\u540e\u4f1a\u770b\u770b\u4f60\u53ef\u4ee5\u7ba1\u7406\u5b83\u7684\u65b9\u6cd5\u3002<\/p>\n
\u8f93\u5165\u662f\u6839\u636e\u5173\u8054\u5c5e\u6027\u7684\u6570\u636e\u7c7b\u578b\u751f\u6210\u7684\uff0c\u5982\u8868 6.1 \u4e2d\u6240\u8ff0\u3002\u8bf7\u6ce8\u610f\uff0c\u5373\u4f7f\u60a8\u5c1a\u672a\u8bbe\u7f6e\u503c\uff0c\u4e5f\u5df2\u4e3a\u591a\u4e2a\u8f93\u5165\u5206\u914d\u4e86\u503c\u3002\u5173\u8054\u7684\u5c5e\u6027\u4e0d\u53ef\u4e3a\u7a7a\uff0c\u56e0\u6b64\u5b83\u4eec\u88ab\u89c6\u4e3a\u5fc5\u9700\u5c5e\u6027\uff0c\u5e76\u4e14\u5df2\u4e3a\u5176\u5206\u914d\u4e86\u9ed8\u8ba4\u503c\u3002\u73b0\u5728\u8ba9\u6211\u4eec\u770b\u770b\u8868\u5355\u7684\u6e32\u67d3\u6e90\u4ee3\u7801\u3002<\/p>\n
\u6e05\u5355 6.4 \u8868\u5355\u7684\u6e32\u67d3\u6e90<\/p>\n
<form method="post">\n    <div class="mb-3">\n        <label class="form-label" for="Name">Name<\/label>\n        <input class="form-control" type="text" id="Name" \n         \u27a5 name="Name" value="" \/>\n    <\/div>\n    <div class="mb-3">\n        <label class="form-label"\n         \u27a5 for="MaxNumberOfGuests">MaxNumberOfGuests<\/label>\n        <input class="form-control" type="number" data-val="true" \ndata-val-required="The MaxNumberOfGuests field is required." \nid="MaxNumberOfGuests" name="MaxNumberOfGuests" value="0" \/>\n    <\/div>\n    <div class="mb-3">\n        <label class="form-label" for="DayRate">DayRate<\/label>\n        <input class="form-control" type="text" data-val="true" \ndata-val-number="The field DayRate must be a number." \n\u27a5 data-val-required="The DayRate field is required." \n\u27a5 id="DayRate" name="DayRate" value="0.00" \/>\n    <\/div>\n    <div class="mb-3">\n        <label class="form-label" for="AvailableFrom">AvailableFrom<\/label>\n        <input class="form-control" type="datetime-local" data-val="true" \n        \u27a5 data-val-required="The AvailableFrom field is required."          \n        \u27a5 id="AvailableFrom"\n name="AvailableFrom" value="0001-01-01T00:00:00.000" \/>\n    <\/div>\n    <div class="mb-3">\n        <label for="SmokingPermitted">SmokingPermitted<\/label>\n        <input type="checkbox" data-val="true" \n        \u27a5 data-val-required="The SmokingPermitted field is required." \n        \u27a5 id="SmokingPermitted" name="SmokingPermitted" value="true" \/>\n    <\/div>\n    <div class="mb-3">\n        <button class="btn btn-primary">Submit<\/button>\n    <\/div>\n<input name="__RequestVerificationToken" type="hidden" value="CfDJ...F4" \/>\n<input name="SmokingPermitted" type="hidden" value="false" \/>\n<\/form><\/code><\/pre>\n
\u6240\u6709\u4e0d\u53ef\u4e3a null \u7684\u5c5e\u6027\u90fd\u5305\u62ec\u60a8\u5728\u4e0a\u4e00\u7ae0\u4e2d\u9047\u5230\u7684\u5176\u4ed6\u5ba2\u6237\u7aef\u9a8c\u8bc1\u5c5e\u6027\uff1adata-val \u548c data-val-required\u3002\u6bcf\u4e2a\u5c5e\u6027\u7684 data-val \u5c5e\u6027\u90fd\u8bbe\u7f6e\u4e3a true\u3002\u8be5 data-val-required \u5c5e\u6027\u5206\u914d\u4e86\u4e00\u6761\u9519\u8bef\u6d88\u606f\uff0c\u8be5\u6d88\u606f\u5df2\u81ea\u5b9a\u4e49\u4e3a\u5173\u8054\u5c5e\u6027\u3002<\/p>\n
\u5ffd\u7565\u6211\u5728\u7b2c 13 \u7ae0\u4e2d\u4ecb\u7ecd\u7684\u8bf7\u6c42\u9a8c\u8bc1\u4ee4\u724c\uff0c\u53e6\u4e00\u4e2a\u503c\u5f97\u5173\u6ce8\u7684\u70b9\u662f\u5df2\u7ecf\u4e3a SmokingPermitted \u5c5e\u6027\u751f\u6210\u4e86\u4e24\u4e2a\u8f93\u5165\u3002\u7b2c\u4e00\u4e2a\u662f\u60a8\u5e0c\u671b\u770b\u5230\u7684\u590d\u9009\u6846\uff0c\u6839\u636e\u8868 6.1 \u4e2d\u63cf\u8ff0\u7684\u6620\u5c04\uff0c\u4e3a Boolean \u503c\u5448\u73b0\u3002\u7b2c\u4e8c\u4e2a\u662f\u5305\u542b\u5728\u7ed3\u675f form \u6807\u7b7e\u4e4b\u524d\u7684\u9690\u85cf\u8f93\u5165\uff1a<\/p>\n
<input name="SmokingPermitted" type="hidden" value="false" \/><\/code><\/pre>\n
\u901a\u5e38\uff0c\u5982\u679c\u672a\u9009\u4e2d\u590d\u9009\u6846\uff0c\u5219\u5728\u63d0\u4ea4\u8868\u5355\u65f6\uff0c\u4e0d\u4f1a\u5411\u670d\u52a1\u5668\u4f20\u9012\u5173\u8054\u5c5e\u6027\u7684\u503c\u3002\u9690\u85cf\u5b57\u6bb5\u5c06\u786e\u4fdd\u8868\u5355\u63d0\u4ea4\u4e2d\u5c06\u5305\u542b\u540d\u79f0-\u503c\u5bf9\uff0c\u65e0\u8bba\u662f\u5426\u9009\u4e2d\u8be5\u590d\u9009\u6846\u3002\u5982\u679c\u9009\u4e2d\u8be5\u590d\u9009\u6846\uff0c\u5219\u53d1\u5e03\u7684\u503c\u5c06\u4e3a true\uff0cfalse\u3002\u5426\u5219\uff0c\u5b83\u5c06\u4e3a false\u3002\u57fa\u4e8e\u6b64\uff0c\u6a21\u578b\u7ed1\u5b9a\u5668\u5c06\u80fd\u591f\u63a8\u65ad\u51fa\u8981\u5206\u914d\u7ed9 PageModel \u5c5e\u6027\u7684\u6b63\u786e\u503c\u3002\u6b64\u884c\u4e3a\u5b9e\u9645\u4e0a\u662f MVC \u7684\u4e00\u4e2a\u529f\u80fd\uff0c\u5176\u4e2d\u9009\u62e9\u8981\u5728\u63a7\u5236\u5668\u4e0a\u6267\u884c\u7684\u7279\u5b9a\u4f5c\u53ef\u4ee5\u5f52\u7ed3\u4e3a\u4f5c\u65b9\u6cd5\u91c7\u7528\u7684\u53c2\u6570\uff0c\u8fd9\u4e9b\u53c2\u6570\u662f\u4ece\u5df2\u53d1\u5e03\u7684\u503c\u7684\u96c6\u5408\u4e2d\u786e\u5b9a\u7684\u3002<\/p>\n
\u5982\u679c\u60a8\u4e0d\u5e0c\u671b\u5448\u73b0\u9690\u85cf\u5b57\u6bb5\uff0c\u89e3\u51b3\u65b9\u6cd5\u662f\u907f\u514d\u4f7f\u7528\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u6765\u5448\u73b0\u5e03\u5c14\u5c5e\u6027\u7684\u590d\u9009\u6846\u3002\u5728\u8fd9\u4e9b\u60c5\u51b5\u4e0b\uff0c\u8bf7\u6539\u7528\u7eaf HTML\u3002<\/p>\n
6.2.2 \u4f7f\u7528\u6570\u636e\u6ce8\u91ca\u5c5e\u6027\u63a7\u5236\u8868\u793a<\/h3>\n
\u6570\u636e\u6ce8\u91ca\u5c5e\u6027\u9a7b\u7559\u5728 System.ComponentModel.DataAnnotations \u547d\u540d\u7a7a\u95f4\u4e2d\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u5411\u7c7b\u578b\u6dfb\u52a0\u989d\u5916\u4fe1\u606f\u6216\u5143\u6570\u636e\u7684\u65b9\u6cd5\u3002.NET \u4e2d\u7684\u5404\u79cd\u7ec4\u4ef6\u6846\u67b6\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u9644\u52a0\u4fe1\u606f\u6765\u5f71\u54cd\u5176\u884c\u4e3a\u3002\u6570\u636e\u6ce8\u91ca\u5c5e\u6027\u5e7f\u6cdb\u7528\u4e8e Razor Pages \u4e2d\u7684\u8868\u5355\uff0c\u4ee5\u5f71\u54cd\u9a8c\u8bc1\uff08\u5982\u60a8\u6240\u89c1\uff09\u548c\u6f14\u793a\u3002\u672c\u8282\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528\u5c5e\u6027\u6765\u5f71\u54cd\u4f5c\u4e3a\u8868\u5355\u7684\u4e00\u90e8\u5206\u751f\u6210\u7684 HTML\u3002\u5728\u7ba1\u7406 UI \u65f6\uff0c\u6709\u4e24\u4e2a\u5c5e\u6027\u7279\u522b\u503c\u5f97\u5173\u6ce8\uff1aDataTypeAttribute \u548c DisplayAttribute\u3002<\/p>\n
\u4f7f\u7528 DataTypeAttribute \u5f71\u54cd\u5448\u73b0\u7684\u8f93\u5165\u7c7b\u578b<\/h2>\n
DataTypeAttribute \u4f7f\u60a8\u80fd\u591f\u6307\u5b9a\u6bd4 .NET \u7c7b\u578b\u7cfb\u7edf\u63d0\u4f9b\u7684\u66f4\u5177\u4f53\u7684\u7c7b\u578b\u7684\u540d\u79f0\uff0c\u5e76\u5c06\u8be5\u7c7b\u578b\u4e0e\u5c5e\u6027\u76f8\u5173\u8054\u3002\u8f93\u5165\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u5c06\u4f7f\u7528\u60a8\u6307\u5b9a\u7684\u5143\u6570\u636e\u6765\u8986\u76d6\u4e3a\u8f93\u5165\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7684 type \u5c5e\u6027\u751f\u6210\u7684\u503c\uff0c\u4ece\u800c\u4ea7\u751f\u5bf9\u6307\u5b9a\u7c7b\u578b\u552f\u4e00\u7684 UI \u884c\u4e3a\u3002\u4f8b\u5982\uff0c.NET \u4e2d\u6ca1\u6709\u5bc6\u7801\u7c7b\u578b\uff0c\u4f46\u60a8\u53ef\u4ee5\u901a\u8fc7\u6570\u636e\u6ce8\u91ca\u5c5e\u6027\u6307\u5b9a\u5b57\u7b26\u4e32\u5e94\u88ab\u89c6\u4e3a\u5bc6\u7801\u7c7b\u578b\u3002\u6846\u67b6\u7684\u5927\u90e8\u5206\u5185\u5bb9\u90fd\u4f1a\u5ffd\u7565\u6b64\u5143\u6570\u636e\uff0c\u4f46 input \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u5c06\u901a\u8fc7\u5c06\u5448\u73b0\u7684\u63a7\u4ef6\u4e0a\u7684 type \u5c5e\u6027\u8bbe\u7f6e\u4e3a password \u6765\u54cd\u5e94\u5b83\u3002\u6d4f\u89c8\u5668\u5c06\u5448\u73b0\u4e00\u4e2a\u7c7b\u578b\u8bbe\u7f6e\u4e3a\u5bc6\u7801\u7684\u8f93\u5165\uff0c\u4f5c\u4e3a\u4e00\u4e2a\u8868\u5355\u63a7\u4ef6\uff0c\u4f5c\u4e3a\u5b89\u5168\u63aa\u65bd\uff0c\u8be5\u63a7\u4ef6\u4f1a\u9690\u85cf\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u8f93\u5165\u7684\u5b57\u7b26\u3002<\/p>\n
DataType \u5c5e\u6027\u6709\u4e24\u4e2a\u6784\u9020\u51fd\u6570\u3002\u4e00\u4e2a\u91c7\u7528 DataType \u679a\u4e3e\u503c\uff0c\u53e6\u4e00\u4e2a\u91c7\u7528\u5b57\u7b26\u4e32\u3002\u679a\u4e3e\u503c\u8303\u56f4\u5f88\u5e7f\uff0c\u4f46\u53ea\u6709\u4e00\u4e2a\u5b50\u96c6\u4f1a\u5f71\u54cd HTML \u8f93\u5165\u4e0a\u751f\u6210\u7684\u7c7b\u578b\u3002\u8868 6.2 \u4e2d\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5b83\u4eec\u3002<\/p>\n
\u8868 6.2 DataType \u679a\u4e3e\u548c\u8f93\u5165\u7c7b\u578b\u4e4b\u95f4\u7684\u6620\u5c04<\/p>\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n\n
\n
<\/a>DataType<\/span> enumeration<\/p>\n<\/th>\n
\n
<\/a>Input element\u2019s type attribute<\/p>\n<\/th>\n<\/tr>\n
\n
<\/a>Date<\/span><\/a><\/p>\n<\/td>\n
\n
<\/a>date<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
<\/a>EmailAddress<\/span><\/a><\/p>\n<\/td>\n
\n
<\/a>email<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
<\/a>Password<\/span><\/a><\/p>\n<\/td>\n
\n
<\/a>password<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
<\/a>PhoneNumber<\/span><\/p>\n<\/td>\n
\n
<\/a>tel<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
<\/a>Time<\/span><\/a><\/p>\n<\/td>\n
\n
<\/a>time<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
<\/a>Url<\/span><\/a><\/p>\n<\/td>\n
\n
<\/a>url<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u5f53\u60a8\u5c06\u591a\u4e2a\u5c5e\u6027\u5e94\u7528\u4e8e\u4e00\u4e2a\u5c5e\u6027\uff08\u4f8b\u5982\uff0cBindProperty \u5c5e\u6027\u548c DataType\uff09\u65f6\uff0c\u60a8\u53ef\u4ee5\u5728\u5b83\u4eec\u81ea\u5df1\u7684\u4e00\u7ec4\u65b9\u62ec\u53f7\u4e2d\u5355\u72ec\u5e94\u7528\u5b83\u4eec\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4e00\u7ec4\u62ec\u53f7\u5e76\u7528\u9017\u53f7\u5206\u9694\u6bcf\u4e2a\u5c5e\u6027\u3002\u6e05\u5355 6.5 \u4e2d\u7684\u4e24\u4e2a\u793a\u4f8b\u90fd\u662f\u6709\u6548\u7684\u3002<\/p>\n
\u6e05\u5355 6.5 \u5c06\u591a\u4e2a attribute \u5e94\u7528\u4e8e\u5355\u4e2a\u5c5e\u6027\u7684\u4e0d\u540c\u9009\u9879<\/p>\n
[BindProperty]\n[DataType(DataType.Time)]\npublic  DateTime ArrivalTime { get; set; }\n\n[BindProperty, DataType(DataType.Time)]\npublic  DateTime DepartureTime { get; set; }<\/code><\/pre>\n
\u5927\u591a\u6570\u4e3b\u6d41\u6d4f\u89c8\u5668\u90fd\u652f\u6301 week \u548c month \u8f93\u5165\uff0c\u4f7f\u7528\u6237\u80fd\u591f\u6307\u5b9a\u4e00\u5e74\u4e2d\u7684\u4e00\u5468\u6216\u4e00\u4e2a\u6708\u3002\u8fd9\u4e9b\u8f93\u5165\u7c7b\u578b\u6ca1\u6709\u5339\u914d\u7684 DataType \u679a\u4e3e\u503c\u3002\u76f8\u53cd\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 DataType \u5c5e\u6027\u7684\u6784\u9020\u51fd\u6570\uff0c\u8be5\u6784\u9020\u51fd\u6570\u63a5\u53d7\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5c06 input \u7c7b\u578b\u8bbe\u7f6e\u4e3a\u8fd9\u4e9b\u9009\u9879\u4ee5\u53ca\u8868 6.2 \u4e2d\u672a\u6db5\u76d6\u7684\u4efb\u4f55\u5176\u4ed6\u9009\u9879\uff1a<\/p>\n
[DataType("week")]\npublic  DateTime ArrivalWeek { get; set; }<\/code><\/pre>\n
\u9664\u4e86 DataType \u679a\u4e3e\u4e4b\u5916\uff0c\u8fd8\u6709\u540d\u79f0\u7c7b\u4f3c\u7684\u72ec\u7acb\u5c5e\u6027\uff1a<\/p>\n
\u2022  EmailAddress
\n\u2022  Phone
\n\u2022  Url<\/p>\n
\u867d\u7136\u8fd9\u4e9b\u4e5f\u4f1a\u5f71\u54cd\u5206\u914d\u7ed9 rendered type \u5c5e\u6027\u7684\u503c\uff0c\u4f46\u5b83\u4eec\u7ee7\u627f\u81ea ValidationAttribute \u5e76\u53c2\u4e0e\u9a8c\u8bc1\uff0c\u5982\u4e0a\u4e00\u7ae0\u6240\u793a\u3002System.ComponentModel.DataAnnotations \u5e76\u4e0d\u662f\u53ef\u4ee5\u627e\u5230\u8fd9\u4e9b\u7c7b\u578b\u7684\u5c5e\u6027\u7684\u552f\u4e00\u4f4d\u7f6e\u3002HiddenInput \u662f\u5c5e\u4e8e MVC \u6846\u67b6\u7684\u53e6\u4e00\u4e2a\u72ec\u7acb\u5c5e\u6027;\u53ef\u4ee5\u5728 Microsoft.AspNetCore.Mvc \u547d\u540d\u7a7a\u95f4\u4e0b\u627e\u5230\u5b83\u3002\u5f53\u5e94\u7528\u4e8e PageModel \u5c5e\u6027\u65f6\uff0c\u5173\u8054\u7684\u8f93\u5165\u5c06\u5448\u73b0\uff0c\u5e76\u5c06\u5176 type \u5c5e\u6027\u8bbe\u7f6e\u4e3a hidden\u3002<\/p>\n
\u30006.2.3 \u683c\u5f0f\u5316\u6e32\u67d3\u7684\u65e5\u671f\u6216\u65f6\u95f4\u503c<\/h3>\n
\u5728\u67e5\u770b\u521a\u521a\u4e3a\u6dfb\u52a0\u65b0\u5c5e\u6027\u800c\u521b\u5efa\u7684\u8868\u5355\u65f6\uff0c\u60a8\u53ef\u80fd\u5df2\u7ecf\u6ce8\u610f\u5230\uff0c\u4e3a DateTime PageModel \u5c5e\u6027\u751f\u6210\u7684 HTML 5 \u65e5\u671f\u65f6\u95f4\u672c\u5730\u8f93\u5165\u7c7b\u578b\u652f\u6301\u5c06\u503c\u8bbe\u7f6e\u4e3a\u6beb\u79d2\uff08\u56fe 6.3\uff09\u3002\u4f46\u662f\uff0c\u5411\u7528\u6237\u516c\u5f00\u6b64\u529f\u80fd\u51e0\u4e4e\u6ca1\u6709\u610f\u4e49\u3002<\/p>\n
<\/p>\n
\u56fe 6.3 \u65e5\u671f\u65f6\u95f4\u503c\u7684\u9ed8\u8ba4\u7ed1\u5b9a\u4f1a\u6fc0\u6d3b\u5728\u65e5\u671f\u65f6\u95f4\u672c\u5730\u63a7\u4ef6\u4e2d\u8bbe\u7f6e\u6beb\u79d2\u7684\u529f\u80fd\u3002<\/p>\n
\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u5c06\u503c\u5206\u914d\u7ed9\u7ed1\u5b9a\u7684 DateTime \u5c5e\u6027\uff0c\u5219\u5176\u6beb\u79d2\u90e8\u5206\u5c06\u516c\u5f00\u7ed9\u6d4f\u89c8\u5668\u63a7\u4ef6\uff0c\u4ece\u800c\u6fc0\u6d3b\u8bbe\u7f6e\u8fd9\u90e8\u5206\u503c\u7684\u529f\u80fd\u3002\u60a8\u53ef\u4ee5\u901a\u8fc7\u5c06\u683c\u5f0f\u5b57\u7b26\u4e32\u5e94\u7528\u4e8e DateTime \u503c\u6765\u63a7\u5236\u8fd9\u4e00\u70b9\u3002\u4f7f\u7528 DisplayFormat \u5c5e\u6027\u53ef\u4ee5\u5c06\u683c\u5f0f\u5b57\u7b26\u4e32\u5e94\u7528\u4e8e\u5c5e\u6027\u3002\u8be5\u683c\u5f0f\u9002\u7528\u4e8e\u4f7f\u7528\u8be5\u5c5e\u6027\u7684\u4efb\u4f55\u5730\u65b9\uff08\u5047\u8bbe\u8be5\u4f4d\u7f6e\u662f\u6846\u67b6\u8bc6\u522b\u5e76\u5e94\u7528\u6570\u636e\u6ce8\u91ca\u63d0\u793a\u7684\u4f4d\u7f6e\uff09\u3002\u683c\u5f0f\u5b57\u7b26\u4e32\u662f\u901a\u8fc7\u5c5e\u6027\u7684 DataFormatString \u5c5e\u6027\u6307\u5b9a\u7684\uff0c\u53e6\u4e00\u4e2a\u5c5e\u6027 ApplyFormatInEditMode \u5fc5\u987b\u8bbe\u7f6e\u4e3a true\uff0c\u624d\u80fd\u5728\u53ef\u7f16\u8f91\u8bbe\u7f6e\uff08\u5982\u8868\u5355\u8f93\u5165\uff09\u4e2d\u5e94\u7528\u683c\u5f0f\u5b57\u7b26\u4e32\uff1a<\/p>\n
[BindProperty, DisplayFormat(DataFormatString = "{0:yyyy-MM-ddTHH:mm}",\nApplyFormatInEditMode = true)]\npublic DateTime AvailableFrom { get; set; } = DateTime.Now;<\/code><\/pre>\n
\u6216\u8005\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 input \u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u7684 format \u5c5e\u6027\u6765\u63a7\u5236\u5404\u4e2a input \u63a7\u4ef6\u7684\u683c\u5f0f\uff1a<\/p>\n
<input asp-for="AvailableFrom" asp-format="{0:yyyy-MM-ddTHH:mm}" \/><\/code><\/pre>\n
\u5e94\u7528\u4e86\u8fd9\u4e9b\u793a\u4f8b\u4e2d\u6240\u793a\u7684\u683c\u5f0f\u5b57\u7b26\u4e32\u540e\uff0c\u53ea\u6709\u65f6\u95f4\u7684\u5c0f\u65f6\u548c\u5206\u949f\u5143\u7d20\u53ef\u4ee5\u5728\u6d4f\u89c8\u5668\u4e2d\u8bbe\u7f6e\uff08\u56fe 6.4\uff09\u3002<\/p>\n
<\/p>\n
\u56fe 6.4 \u79d2\u548c\u6beb\u79d2\u90e8\u5206\u7684\u65f6\u95f4\u4e0d\u518d\u53ef\u8bbe\u7f6e\u3002<\/p>\n
\u3000\u652f\u6301\u7684\u65e5\u671f\u548c\u65f6\u95f4\u683c\u5f0f<\/h2>\n
\u57fa\u4e8e\u65e5\u671f\u548c\u65f6\u95f4\u7684\u8f93\u5165\u7c7b\u578b\u4e3b\u8981\u652f\u6301\u6839\u636e RFC 3339 \uff08https:\/\/datatracker.ietf.org\/doc\/html\/rfc3339<\/a>\uff09 \u4e2d\u6307\u5b9a\u7684\u89c4\u5219\u8bbe\u7f6e\u683c\u5f0f\u7684\u503c\u3002\u7b80\u800c\u8a00\u4e4b\uff0c\u5b83\u4eec\u8981\u6c42\u5c06\u5e74\u4efd\u8868\u793a\u4e3a\u56db\u4f4d\u6570\uff0c\u5e76\u5c06\u65e5\u671f\u548c\u65f6\u95f4\u7ec4\u4ef6\u4ece\u6700\u4e0d\u5177\u4f53\uff08\u5373\u5e74\u4efd\uff09\u5230\u6700\u5177\u4f53\u7684\u987a\u5e8f\u6392\u5e8f\u3002\u65f6\u95f4\u90e8\u5206\u5e94\u4e0e\u65e5\u671f\u4e4b\u95f4\u7528\u5927\u5199\u7684 T \u5206\u9694\u3002\u5728 .NET \u4e2d\uff0c\u4ee5\u4e0b\u683c\u5f0f\u5b57\u7b26\u4e32\u8868\u793a\u8fd9\u4e00\u70b9\uff1a<\/p>\n
yyyy-MM-ddTHH:mm:ss.fff<\/code><\/pre>\n
\u79d2 \uff08ss\uff09 \u548c\u6beb\u79d2 \uff08fff\uff09 \u5bf9\u4e8e\u5927\u591a\u6570\u6d4f\u89c8\u5668\u6765\u8bf4\u662f\u53ef\u9009\u7684\uff0c\u524d\u63d0\u662f\u4f60\u5305\u542b time \u5143\u7d20\u3002<\/p>\n
\u5468\u8f93\u5165\u7c7b\u578b\u7528\u4e8e\u6839\u636e ISO 8601 \u5468\u7f16\u53f7\u9009\u62e9\u4e00\u5e74\u4e2d\u7684\u4e00\u5468\u3002\u5468\u8f93\u5165\u652f\u6301\u7684\u683c\u5f0f\u4e3a yyyy-Www\uff0c\u5176\u4e2d -W \u662f\u6587\u672c\uff0cww \u8868\u793a\u4e00\u5e74\u4e2d\u7684\u4e00\u5468\u3002\u9ed8\u8ba4\u6a21\u578b\u7ed1\u5b9a\u5668\u4e0d\u5305\u62ec\u5bf9\u6b64\u683c\u5f0f\u7684\u652f\u6301\uff0c\u56e0\u4e3a .NET \u4e0d\u652f\u6301\u5c06\u5176\u4f5c\u4e3a\u6709\u6548\u7684\u65e5\u671f\/\u65f6\u95f4\u683c\u5f0f\u5b57\u7b26\u4e32\u3002\u5982\u679c\u9700\u8981\u4f7f\u7528 week \u8f93\u5165\u7c7b\u578b\uff0c\u5219\u5fc5\u987b\u81ea\u5df1\u4ee5\u6b63\u786e\u7684\u683c\u5f0f\u751f\u6210\u503c\u3002\u7136\u540e\uff0c\u60a8\u53ef\u4ee5\u81ea\u5df1\u89e3\u6790 Request.Form \u4e2d\u7684\u503c\uff0c\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u81ea\u5b9a\u4e49\u6a21\u578b Binder\u3002\u8fd9\u662f\u4e00\u4e2a\u9ad8\u7ea7\u4e3b\u9898\uff0c\u672c\u4e66\u4e0d\u4f1a\u6d89\u53ca\uff0c\u4f46\u60a8\u53ef\u4ee5\u53c2\u8003\u6211\u7684\u535a\u5ba2\u6587\u7ae0\uff0c\u8be5\u6587\u7ae0\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7279\u5b9a\u4e8e\u4f7f\u7528\u5468\u8f93\u5165\u7c7b\u578b\u7684\u793a\u4f8b\uff1ahttp:\/\/mng.bz\/M5eW<\/a>\u3002<\/p>\n
\u30006.2.4 \u4f7f\u7528 DisplayAttribute \u63a7\u5236\u6807\u7b7e<\/h3>\n
\u524d\u9762\uff0c\u6211\u6ce8\u610f\u5230\u8868\u5355\u4e2d\u5448\u73b0\u7684\u8bb8\u591a\u6807\u7b7e\u503c\uff08\u56fe 6.1\uff09\u7f3a\u4e4f\u7528\u6237\u53cb\u597d\u6027\u3002\u6807\u7b7e\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u53ea\u662f\u83b7\u53d6 C# \u5c5e\u6027\u7684\u540d\u79f0\uff0c\u5e76\u6309\u539f\u6837\u5448\u73b0\u5b83 - \u5305\u62ec Pascal \u5927\u5c0f\u5199\u3002\u5982\u679c\u4f60\u5c06 label \u6807\u7b7e helper \u7684\u5185\u5bb9\u7559\u7a7a\uff0c\u5c31\u4f1a\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\uff0c\u5c31\u50cf\u6211\u4eec\u5728\u6b64\u793a\u4f8b\u8868\u5355\u4e2d\u6240\u505a\u7684\u90a3\u6837\u3002\u8986\u76d6\u6b64\u884c\u4e3a\u7684\u4e00\u79cd\u65b9\u6cd5\u662f\u5728 label \u6807\u7b7e\u7684\u6bcf\u4e2a\u5b9e\u4f8b\u4e2d\u63d0\u4f9b\u60a8\u7684\u5185\u5bb9\uff1a<\/p>\n
<label asp-for="DayRate">Day Rate<\/label><\/code><\/pre>\n
\u6216\u8005\uff0c\u60a8\u4e5f\u53ef\u4ee5\u5c06 DisplayAttribute \u5e94\u7528\u4e8e\u5c5e\u6027\uff0c\u4ee5\u901a\u8fc7\u5c06\u9996\u9009\u6807\u7b7e\u6587\u672c\u5206\u914d\u7ed9\u5176 Name \u5c5e\u6027\u6765\u63a7\u5236\u8f93\u51fa\uff1a<\/p>\n
[BindProperty]\n[Display(Name="Day Rate")]\npublic decimal DayRate { get; set; } <\/code><\/pre>\n
\u6b64\u65b9\u6cd5\u7684\u4e3b\u8981\u597d\u5904\u662f\u53ef\u4ee5\u96c6\u4e2d\u914d\u7f6e\uff0c\u56e0\u6b64\u65e0\u9700\u5728 Razor \u9875\u9762\u4e2d\u56db\u5904\u5bfb\u627e\u8fdb\u884c\u66f4\u6539\u3002\u4e0b\u9762\u7684\u6e05\u5355\u663e\u793a\u4e86\u5e94\u7528\u4e86\u6570\u636e\u7c7b\u578b\u548c\u663e\u793a\u5c5e\u6027\u7684 Create Property \u9875\u7684\u4fee\u8ba2\u540e\u7684 PageModel \u5c5e\u6027\u3002\u56fe 6.5 \u8bf4\u660e\u4e86\u6846\u67b6\u5982\u4f55\u5c06\u5c5e\u6027\u503c\u5e94\u7528\u4e8e\u5448\u73b0\u7684\u6807\u7b7e\u3002<\/p>\n
\u6e05\u5355 6.6 \u4f7f\u7528\u5408\u9002\u7684\u5c5e\u6027\u88c5\u9970\u7684\u516c\u5171 PageModel \u5c5e\u6027<\/p>\n
[BindProperty]\npublic string Name { get; set; }\n[BindProperty]\n[Display(Name = "Maximum Number Of Guests")]\npublic int MaxNumberOfGuests { get; set; }\n[BindProperty]\n[Display(Name ="Day Rate")]\npublic decimal DayRate { get; set; }\n[BindProperty]\n[Display(Name = "Smoking Permitted")]\npublic bool SmokingPermitted { get; set; }\n[BindProperty] \n[DataType(DataType.Date)]\n[Display(Name ="Available From")]\npublic DateTime AvailableFrom { get; set; }<\/code><\/pre>\n
<\/p>\n
\u56fe 6.5 \u6570\u636e\u6ce8\u91ca\u5c5e\u6027\u7528\u4e8e\u7ba1\u7406\u6807\u7b7e\u548c\u8f93\u5165\u8868\u793a\u3002<\/p>\n
\u8fd9\u6837\u5c31\u5b8c\u6210\u4e86\u6211\u4eec\u5bf9\u57fa\u672c input \u548c label \u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u7684\u4e86\u89e3\u3002\u5728\u63a5\u4e0b\u6765\u7684\u90e8\u5206\u4e2d\uff0c\u6211\u4eec\u5c06\u91cd\u70b9\u4ecb\u7ecd\u7528\u4e8e\u5411\u7528\u6237\u63d0\u4f9b\u4e00\u7cfb\u5217\u56fa\u5b9a\u9009\u9879\u7684 select \u6807\u7b7e\u52a9\u624b\uff0c\u7136\u540e\u7ee7\u7eed\u8ba8\u8bba\u590d\u9009\u6846\u548c\u5355\u9009\u6309\u94ae\u8f93\u5165\u7c7b\u578b\u7684\u7279\u6b8a\u6027\u8d28\u3002<\/p>\n
6.3 select \u6807\u7b7e\u52a9\u624b<\/h2>\n
\u5728\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6bcf\u4e2a\u5c5e\u6027\u90fd\u5fc5\u987b\u4f4d\u4e8e\u7279\u5b9a\u57ce\u5e02\uff0c\u56e0\u6b64\u5f53\u7528\u6237\u6dfb\u52a0\u65b0\u5c5e\u6027\u65f6\uff0c\u4ed6\u4eec\u5e94\u8be5\u80fd\u591f\u6307\u5b9a\u8be5\u5c5e\u6027\u6240\u5728\u7684\u57ce\u5e02\u3002\u60a8\u53ef\u4ee5\u4e3a\u6b64\u63d0\u4f9b\u6587\u672c\u8f93\u5165\uff0c\u4f46\u5141\u8bb8\u7528\u6237\u8f93\u5165\u4ed6\u4eec\u60f3\u8981\u7684\u4efb\u4f55\u5185\u5bb9\u7684\u95ee\u9898\u5728\u4e8e\uff0c\u60a8\u53ef\u80fd\u4f1a\u9047\u5230\u62fc\u5199\u9519\u8bef\u548c\u53d8\u5316\u3002\u4f8b\u5982\uff0c\u4ed6\u4eec\u662f\u8f93\u5165 New York \u8fd8\u662f New York City\uff1f\u8be5\u89e3\u51b3\u65b9\u6848\u63d0\u4f9b\u4e86\u4e00\u7ec4\u9884\u5148\u786e\u5b9a\u7684\u9009\u9879\uff0c\u7528\u6237\u53ef\u4ee5\u4ece\u4e2d\u8fdb\u884c\u9009\u62e9\u3002\u4ece UI \u7684\u89d2\u5ea6\u6765\u770b\uff0c\u6700\u7ecf\u6d4e\u548c\u53ef\u7528\u7684\u65b9\u6cd5\u662f\u5728 HTML select \u5143\u7d20\u4e2d\u4e3a\u53ef\u80fd\u4f1a\u589e\u957f\u5f88\u591a\u7684\u5217\u8868\u63d0\u4f9b\u9009\u9879\u3002<\/p>\n
select \u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u4ee5 HTML select \u5143\u7d20\u4e3a\u76ee\u6807\u3002\u5b83\u6709\u4e24\u4e2a\u81ea\u5b9a\u4e49\u5c5e\u6027\uff1a\u73b0\u5728\u719f\u6089\u7684 for \u5c5e\u6027\uff08\u7528\u4e8e\u5c06\u8868\u793a\u6240\u9009\u503c\u7684 PageModel \u5c5e\u6027\u7ed1\u5b9a\u5230 select \u5143\u7d20\uff09\u548c items \u5c5e\u6027\uff08\u901a\u8fc7\u8be5\u5c5e\u6027\u5206\u914d\u9009\u9879\uff09\u3002\u9009\u9879\u662f\u4ece SelectListItem \u5bf9\u8c61\u3001SelectList \u5bf9\u8c61\u6216\u679a\u4e3e\u7684\u96c6\u5408\u4e2d\u586b\u5145\u7684\u3002\u9009\u9879\u4e5f\u53ef\u4ee5\u901a\u8fc7 option tag helper \u5355\u72ec\u8bbe\u7f6e\u3002<\/p>\n
6.3.1 \u521b\u5efa\u9009\u9879<\/h3>\n
HTML option \u5143\u7d20\u8868\u793a select \u5143\u7d20\u4e2d\u7684\u5355\u4e2a\u9009\u9879\u3002\u81f3\u5c11\uff0c\u5b83\u7531\u6d4f\u89c8\u5668\u4e2d\u663e\u793a\u7684\u6587\u672c\u7ec4\u6210\u3002\u4e3a select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u521b\u5efa\u9009\u9879\u7684\u6700\u7b80\u5355\u65b9\u6cd5\u662f\u5c06\u67d0\u79cd\u96c6\u5408\uff08\u5982\u4e0a\u4e00\u7ae0\u4e2d\u4f7f\u7528\u7684\u57ce\u5e02\u6570\u7ec4\uff09\u4f20\u9012\u7ed9 SelectList \u7684\u6784\u9020\u51fd\u6570\u3002\u8981\u4e86\u89e3\u5176\u5de5\u4f5c\u539f\u7406\uff0c\u60a8\u5c06\u5411\u5c5e\u6027\u521b\u5efa\u8868\u5355\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u65b0\u5143\u7d20\uff0c\u4f7f\u7528\u6237\u80fd\u591f\u6307\u5b9a\u5c5e\u6027\u6240\u5728\u7684\u57ce\u5e02\u3002\u8c03\u6574 PropertyManager \u6587\u4ef6\u5939\u4e2d\u7684 CreateModel \u7c7b\u4ee5\u5305\u62ec\u4e24\u4e2a\u989d\u5916\u7684\u9ad8\u4eae\u663e\u793a\u5c5e\u6027\uff0c\u786e\u4fdd SelectedCity \u5c5e\u6027\u4f7f\u7528 BindProperty \u5c5e\u6027\u8fdb\u884c\u88c5\u9970\u3002<\/p>\n
\u5217\u8868 6.7 \u6dfb\u52a0\u5c5e\u6027\u6765\u8868\u793a\u9009\u9879\u548c\u6240\u9009\u503c<\/p>\n
public class CreateModel : PageModel\n{\n    [BindProperty] \n    public string Name { get; set; }\n    [BindProperty]\n    public int MaxNumberOfGuests { get; set; }\n    [BindProperty]\n    public decimal DayRate { get; set; }\n    [BindProperty]\n    public bool SmokingPermitted { get; set; }\n    [BindProperty]\n    public DateTime AvailableFrom { get; set; }\n    [BindProperty]                                          \u2776\n    [Display(Name="City")]                                  \u2776\n    public string SelectedCity { get; set; }                \u2776\n    public SelectList Cities { get; set; }                  \u2777\n\n    public void OnGet()                                     \u2778\n    {                                                       \u2778\n        var cities = new[] { "London", "Berlin", "Paris",   \u2778\n                             \u27a5 "Rome", "New York" };       \u2778\n        Cities = new SelectList(cities);                    \u2778\n    }                                                       \u2778\n}<\/code><\/pre>\n
\u2776 SelectedCity \u5c5e\u6027\u8868\u793a\u6240\u9009\u503c\u3002<\/p>\n
\u2777 Cities \u5c5e\u6027\u8868\u793a\u7528\u6237\u53ef\u4ee5\u4ece\u4e2d\u8fdb\u884c\u9009\u62e9\u7684\u9009\u9879\u3002<\/p>\n
\u2778 \u6dfb\u52a0\u4e86\u4e00\u4e2a OnGet \u5904\u7406\u7a0b\u5e8f\uff0c\u5176\u4e2d\u5305\u542b\u521b\u5efa\u57ce\u5e02\u540d\u79f0\u6570\u7ec4\u5e76\u4f20\u9012\u7ed9 SelectList \u6784\u9020\u51fd\u6570\u7684\u4ee3\u7801\u3002<\/p>\n
\u60a8\u8fd8\u5e94\u8be5\u6dfb\u52a0\u4e00\u4e2a using \u6307\u4ee4\u4ee5\u5305\u62ec Microsoft.AspNetCore.Mvc\u3002Rendering namespace\uff0c\u8fd9\u662f SelectList \u7c7b\u578b\u6240\u5728\u7684\u4f4d\u7f6e\u3002\u73b0\u5728\uff0c\u5bf9\u4f4d\u4e8e PropertyManager \u6587\u4ef6\u5939\u4e2d\u7684 Create.cshtml.cs \u6587\u4ef6\u7684\u6807\u8bb0\u90e8\u5206\u8fdb\u884c\u4e0b\u4e00\u4e2a\u6e05\u5355\u4e2d\u8be6\u8ff0\u7684\u66f4\u6539\u3002\u66f4\u6539\u5c06\u5305\u62ec\u4e00\u4e2a select \u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\uff0c\u8be5\u5e2e\u52a9\u7a0b\u5e8f\u63d0\u4f9b\u4e00\u7cfb\u5217\u57ce\u5e02\u4f9b\u7528\u6237\u9009\u62e9\uff0c\u5f53\u63d0\u4ea4\u8868\u5355\u65f6\uff0c\u6240\u9009\u57ce\u5e02\u7684\u540d\u79f0\u5c06\u5448\u73b0\u5230\u9875\u9762\u3002<\/p>\n
\u6e05\u5355 6.8 \u4fee\u6539\u8868\u5355\u4ee5\u5305\u542b\u4e00\u4e2a select \u6807\u7b7e\u52a9\u624b<\/p>\n
@if (Request.HasFormContentType)                                      \u2776\n{                                                                     \u2776\n    <p>You selected @Model.SelectedCity<\/p>                           \u2776\n}                                                                     \u2776\n<form method="post">\n    <div class="mb-3">                                                \u2777\n        <label class="form-label" asp-for="SelectedCity"><\/label>     \u2777\n        <select class="form-control" asp-for="SelectedCity"           \u2777\n         \u27a5 asp-items="Model.Cities"><\/select>                        \u2777\n    <\/div>                                                            \u2777\n    <div class="mb-3">\n        <label class="form-label" asp-for="Name"><\/label>\n        <input class="form-control" asp-for="Name" \/>\n    <\/div>\n    <div class="mb-3">\n        <label class="form-label" asp-for="MaxNumberOfGuests"><\/label>\n        <input class="form-control" asp-for="MaxNumberOfGuests" \/>\n    <\/div>\n    <div class="mb-3">\n        <label class="form-label" asp-for="DayRate"><\/label>\n        <input class="form-control" asp-for="DayRate" \/>\n    <\/div>\n    <div class="mb-3">\n        <label class="form-label" asp-for="AvailableFrom"><\/label>\n        <input class="form-control" asp-for="AvailableFrom" \/>\n    <\/div>\n    <div class="mb-3">\n        <label asp-for="SmokingPermitted"><\/label>\n        <input asp-for="SmokingPermitted" \/>\n    <\/div>\n    <button class="btn btn-primary">Submit<\/button>    \n<\/form><\/code><\/pre>\n
\u2776 \u5982\u679c\u8868\u5355\u5df2\u63d0\u4ea4\uff0c\u5219\u6dfb\u52a0\u6b64\u4ee3\u7801\u5757\u4ee5\u5448\u73b0\u6240\u9009\u57ce\u5e02\u3002
\n\u2777 \u6dfb\u52a0\u6807\u7b7e\u548c\u7528\u4e8e\u7ba1\u7406\u57ce\u5e02\u9009\u62e9\u7684 select \u6807\u7b7e\u52a9\u624b\u3002
\n\u5bfc\u822a\u5230 \/property-manager\/create\u3002\u60a8\u5e94\u8be5\u770b\u5230 London \u51fa\u73b0\u5728 select \u63a7\u4ef6\u4e2d\uff08\u56fe 6.6\uff09\u3002<\/p>\n
<\/p>\n
\u56fe 6.6 London \u662f select \u63a7\u4ef6\u4e2d\u7684\u9ed8\u8ba4\u9009\u9879\u3002<\/p>\n
\u8bf7\u968f\u610f\u5c06\u9009\u62e9\u4fdd\u7559\u4e3a London\uff0c\u6216\u4ece\u9009\u9879\u4e2d\u9009\u62e9\u53e6\u4e00\u4e2a\u57ce\u5e02\uff0c\u7136\u540e\u63d0\u4ea4\u8868\u5355\u3002\u60a8\u5e94\u8be5\u6ce8\u610f\u4e24\u4ef6\u4e8b\uff1a\u7b2c\u4e00\u662f\u9009\u5b9a\u7684\u57ce\u5e02\u88ab\u5448\u73b0\u7ed9\u6d4f\u89c8\u5668\uff0c\u7b2c\u4e8c\u662f\u9009\u9879\u5217\u8868\u4e3a\u7a7a\uff08\u56fe 6.7\uff09\u3002<\/p>\n
<\/p>\n
\u56fe 6.7 \u663e\u793a\u6240\u9009\u9009\u9879\uff0c\u4f46\u9009\u9879\u5217\u8868\u5df2\u6d88\u5931\u3002<\/p>\n
\u90a3\u4e48\u9009\u62e9\u53bb\u54ea\u513f\u4e86\u5462\uff1f\u8fd9\u4e9b\u9009\u9879\u5f53\u524d\u5728 OnGet \u5904\u7406\u7a0b\u5e8f\u4e2d\u751f\u6210\u3002\u4f7f\u7528 POST \u65b9\u6cd5\u5c06\u8868\u5355\u63d0\u4ea4\u5230\u670d\u52a1\u5668\u65f6\uff0c\u4e0d\u4f1a\u6267\u884c OnGet \u5904\u7406\u7a0b\u5e8f\u3002\u7531\u4e8e OnPost \u5904\u7406\u7a0b\u5e8f\u4e2d\u6ca1\u6709\u7528\u4e8e\u6062\u590d city \u9009\u9879\u7684\u5185\u5bb9\uff0c\u56e0\u6b64\u4e0d\u4f1a\u4e3a POST \u8bf7\u6c42\u751f\u6210\u4efb\u4f55\u9009\u9879\u3002\u5728\u4e0b\u4e00\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd\u4e00\u4e2a\u7b80\u5355\u7684\u7b56\u7565\uff0c\u5f53\u60a8\u5c06\u66f4\u590d\u6742\u7684\u5bf9\u8c61\u4f20\u9012\u7ed9 SelectList \u65f6\uff0c\u53ef\u4ee5\u7ea0\u6b63\u6b64\u95ee\u9898\u3002<\/p>\n
\u8bbe\u7f6e options \u7684\u503c<\/h2>\n
\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u60a8\u5df2\u5c06\u4e00\u4e2a\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u6570\u7ec4\u4f20\u9012\u5230 SelectList \u4e2d\u3002SelectList \u5c06\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\u5206\u914d\u7ed9\u9009\u9879\u7684\u6587\u672c\uff0c\u4ece\u800c\u4e3a select \u5143\u7d20\u751f\u6210\u4ee5\u4e0b HTML\u3002<\/p>\n
\u6e05\u5355 6.9 \u4e3a select city \u5143\u7d20\u751f\u6210\u7684 HTML<\/p>\n
<select class="form-control" id="SelectedCity" name="SelectedCity">\n    <option>London<\/option>\n    <option>Berlin<\/option>\n    <option>Paris<\/option>\n    <option>Rome<\/option>\n    <option>New York<\/option>\n<\/select><\/code><\/pre>\n
\u5f53 HTML \u9009\u9879\u5143\u7d20\u4ec5\u5206\u914d\u4e86\u6587\u672c\u65f6\uff0c\u8be5\u6587\u672c\u5c06\u5728\u63d0\u4ea4\u8868\u5355\u65f6\u4f5c\u4e3a\u503c\u4f20\u9012\u3002\u5f53\u60a8\u5904\u7406\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u65f6\uff08\u4ece\u7b2c 8 \u7ae0\u5f00\u59cb\uff09\uff0c\u60a8\u5c06\u66f4\u7ecf\u5e38\u5730\u5e0c\u671b\u4f7f\u7528\u4e0e\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u9879\u5173\u8054\u7684\u552f\u4e00\u6807\u8bc6\u7b26\uff0c\u5373\u5176\u4e3b\u952e\u503c\u3002\u8fd9\u4e9b\u952e\u503c\u5bf9\u666e\u901a\u7528\u6237\u6ca1\u6709\u4efb\u4f55\u610f\u4e49\uff0c\u56e0\u6b64\u60a8\u9700\u8981\u5c06\u952e\u5206\u914d\u7ed9 select \u9009\u9879\u7684 value \u5c5e\u6027\uff0c\u540c\u65f6\u4ecd\u4f20\u5165\u4e00\u6bb5\u6587\u672c\uff0c\u4f7f\u7528\u6237\u80fd\u591f\u4e86\u89e3\u6bcf\u4e2a\u9009\u9879\u6240\u4ee3\u8868\u7684\u5185\u5bb9\u3002\u4f7f\u7528 SelectList \u6784\u9020\u51fd\u6570\u7684\u91cd\u8f7d\uff0c\u53ef\u4ee5\u5c06\u4e0d\u540c\u7684\u503c\u6620\u5c04\u5230\u9009\u9879\u7684 value \u5c5e\u6027\u548c\u6587\u672c\u3002\u4e0b\u4e00\u4e2a\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u4f7f\u7528\u6b64\u91cd\u8f7d\u6765\u6a21\u62df\u5c06\u6bcf\u4e2a\u57ce\u5e02\u7684\u6570\u5b57\u6807\u8bc6\u7b26\u6620\u5c04\u5230 option \u503c\u7684\u8fc7\u7a0b\uff0c\u540c\u65f6\u4ecd\u5411\u7528\u6237\u663e\u793a\u57ce\u5e02\u7684\u540d\u79f0\u3002<\/p>\n
\u60a8\u5c06\u751f\u6210 City \u5bf9\u8c61\u7684\u96c6\u5408\uff0c\u5c31\u50cf\u5728\u4e0a\u4e00\u7ae0\u7684\u590d\u9009\u6846\u793a\u4f8b\u4e2d\u6240\u505a\u7684\u90a3\u6837\u3002\u60a8\u5c06\u8fd9\u4e9b\u5c5e\u6027\u5206\u914d\u7ed9 SelectList\uff0c\u5e76\u6307\u5b9a\u54ea\u4e2a\u5c5e\u6027\u8868\u793a DataValueField\uff08\u9009\u9879\u7684\u503c\uff09\uff0c\u4ee5\u53ca\u5e94\u5c06\u54ea\u4e2a\u5c5e\u6027\u5206\u914d\u7ed9 DataTextField\uff08\u9009\u9879\u7684\u6587\u672c\uff09\u3002\u7531\u4e8e\u60a8\u5bf9\u6bcf\u4e2a\u57ce\u5e02\u4f7f\u7528\u6570\u5b57\u952e\uff0c\u56e0\u6b64 SelectedCity \u5c5e\u6027\u5c06\u4ece\u5b57\u7b26\u4e32\u66f4\u6539\u4e3a int\u3002\u6b64\u5916\uff0c\u60a8\u9700\u8981\u5c06\u751f\u6210 SelectList \u7684\u4ee3\u7801\u653e\u5728\u4e00\u4e2a\u5355\u72ec\u7684\u65b9\u6cd5\u4e2d\uff0c\u5e76\u5728 OnGet \u548c OnPost \u65b9\u6cd5\u4e2d\u8c03\u7528\u5b83\uff0c\u4ee5\u4fbf\u5728\u63d0\u4ea4\u8868\u5355\u540e\u91cd\u65b0\u586b\u5145\u9009\u9879\u3002\u4e0b\u9762\u7684\u6e05\u5355\u663e\u793a\u4e86 CreateModel \u7c7b\u7684\u66f4\u6539\u90e8\u5206\u3002SelectedCity \u4e4b\u524d\u7684\u6240\u6709\u5c5e\u6027\u5747\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n
Listing 6.10 \u4fee\u6539\u540e\u7684 Property Manager \u7684 CreateModel<\/p>\n
[BindProperty]\n[Display(Name = "City")]\npublic int SelectedCity { get; set; }                                      \u2776\npublic SelectList Cities { get; set; }\npublic string Message { get; set; }                                        \u2777\npublic void OnGet()\n{\n    Cities = GetCityOptions();                                             \u2778\n}\n\npublic void OnPost()\n{\n    Cities = GetCityOptions();                                             \u2778\n    if (ModelState.IsValid)\n    {\n        var city = GetCityOptions().First(o => o.Value ==                  \u2779\n        \u27a5 SelectedCity.ToString());                                       \u2779\n        Message = $"You selected {city.Text} with value of {SelectedCity}";\u2779\n    }\n}\n\nprivate SelectList GetCityOptions()                                        \u277a\n{                                                                          \u277a\n    var cities =  new List<City>                                           \u277a\n    {                                                                      \u277a\n        new City{ Id = 1, Name = "London"},                                \u277a\n        new City{ Id = 2, Name = "Paris" },                                \u277a\n        new City{ Id = 3, Name = "New York" },                             \u277a\n        new City{ Id = 4, Name = "Rome" },                                 \u277a\n        new City{ Id = 5, Name = "Dublin" }                                \u277a\n    };                                                                     \u277a\n    return new SelectList(cities, nameof(City.Id), nameof(City.Name));     \u277a\n}                                                                          \u277a<\/code><\/pre>\n
\u2776 \u5c06 SelectedCity \u4ece string \u66f4\u6539\u4e3a int\u3002
\n\u2777 \u6dfb\u52a0\u540d\u4e3a Message \u7684\u5b57\u7b26\u4e32\u5c5e\u6027\u3002
\n\u2778 \u4ece\u65b0\u7684\u79c1\u6709 GetCityOptions \u65b9\u6cd5\u5206\u914d Cities\u3002
\n\u2779 \u4ece GetCityOptions \u65b9\u6cd5\u751f\u6210\u7684\u6570\u636e\u4e2d\u83b7\u53d6\u6240\u9009\u57ce\u5e02\u7684\u8be6\u7ec6\u4fe1\u606f\u3002
\n\u277a \u6dfb\u52a0\u4e00\u4e2a\u7528\u4e8e\u751f\u6210\u57ce\u5e02\u7684\u79c1\u6709\u65b9\u6cd5\uff0c\u4ee5\u4fbf\u5c06\u903b\u8f91\u96c6\u4e2d\u5728\u4e00\u4e2a\u5730\u65b9\u3002<\/p>\n
Razor \u9875\u9762\u552f\u4e00\u9700\u8981\u7684\u66f4\u6539\u662f\u5305\u62ec Message \u5c5e\u6027\uff0c\u4ee5\u4fbf\u4f60\u53ef\u4ee5\u770b\u5230\u6240\u9009\u57ce\u5e02\u7684\u786e\u8ba4\u3002\u6211\u5c06\u5b83\u653e\u5728\u9875\u9762\u9876\u90e8\uff0c\u5728\u5f00\u59cb\u7684 form \u5143\u7d20\u4e4b\u524d\uff1a<\/p>\n
<p>@Model.Message<\/p><\/code><\/pre>\n
\u8fd0\u884c\u9875\u9762\u5e76\u9009\u62e9\u4e00\u4e2a\u57ce\u5e02\u3002\u63d0\u4ea4\u8868\u5355\u540e\uff0c\u60a8\u4f1a\u6ce8\u610f\u5230\u6240\u9009\u57ce\u5e02\u7684\u8be6\u7ec6\u4fe1\u606f\u5df2\u5448\u73b0\u7ed9\u6d4f\u89c8\u5668\uff08\u56fe 6.8\uff09\u3002<\/p>\n
<\/p>\n
\u56fe 6.8 \u6240\u9009\u57ce\u5e02\u7684\u8be6\u7ec6\u4fe1\u606f\u5c06\u5448\u73b0\u5230\u6d4f\u89c8\u5668\u4e2d\u3002<\/p>\n
\u5f53\u4f60\u67e5\u770b\u9875\u9762\u7684\u6e90\u4ee3\u7801\u65f6\uff0c\u4f60\u4f1a\u770b\u5230\u4f60\u9009\u62e9\u7684\u9009\u9879\u4e5f\u5e94\u7528\u4e86 selected \u5c5e\u6027\uff08\u56fe 6.9\uff09\u3002<\/p>\n
<\/p>\n
\u56fe 6.9 \u6240\u9009\u9009\u9879\u5e94\u7528\u4e86\u6240\u9009\u5c5e\u6027\u3002<\/p>\n
\u60a8\u5e94\u8be5\u80fd\u591f\u4ece\u6b64\u884c\u4e3a\u4e2d\u63a8\u65ad\u51fa\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u5c06 select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7684\u503c\u5206\u914d\u7ed9\u7ed1\u5b9a\u5230\u5176 for \u5c5e\u6027\u7684\u5c5e\u6027\u6765\u8bbe\u7f6e\u6240\u9009\u9879\u76ee\u3002\u5f53\u7136\uff0c\u60a8\u81ea\u5df1\u6ca1\u6709\u5c06\u503c\u5206\u914d\u7ed9 SelectedCity \u5c5e\u6027;\u6a21\u578b\u6d3b\u9875\u5939\u4e3a\u60a8\u5b8c\u6210\u4e86\u8fd9\u9879\u5de5\u4f5c\u3002<\/p>\n
\u8bbe\u7f6e\u6240\u9009\u503c<\/h2>\n
\u9664\u4e86\u4e3a bound \u5c5e\u6027\u5206\u914d\u503c\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7\u5c06\u9644\u52a0\u53c2\u6570\u503c\u4f20\u9012\u7ed9\u8868\u793a\u6240\u9009\u9009\u9879\u503c\u7684 SelectList \u6784\u9020\u51fd\u6570\u6765\u8bbe\u7f6e\u6240\u9009\u503c\uff1a<\/p>\n
var cities = new SelectList(cities, nameof(City.Id), nameof(City.Name), 3);<\/code><\/pre>\n
\u6216\u8005\uff0c\u60a8\u53ef\u4ee5\u663e\u5f0f\u6784\u9020 SelectListItem\u7684\u96c6\u5408\uff0c\u5e76\u5c06\u5176\u4e2d\u4e00\u4e2a\u5143\u7d20\u4e0a\u7684 Selected \u5c5e\u6027\u8bbe\u7f6e\u4e3a true\u3002<\/p>\n
\u5217\u8868 6.11 \u6784\u9020 SelectListItem\u7684\u96c6\u5408<\/p>\n
private SelectList GetCityOptions()\n{\n    var cities =  new List<SelectListItem>    \n    {\n        new SelectListItem{ Value = "1", Text = "London"},\n        new SelectListItem{ Value = "2", Text = "Paris" },\n        new SelectListItem{ Value = "3", Text = "New York", Selected = \n        \u27a5 true },\n        new SelectListItem{ Value = "4", Text = "Rome" },\n        new SelectListItem{ Value = "5", Text = "Dublin" }\n    };\n    return new SelectList(cities);\n}<\/code><\/pre>\n
\u50cf\u8fd9\u6837\u7684\u65b9\u6cd5\uff08\u5728\u4f60\u663e\u5f0f\u8bbe\u7f6e\u6240\u9009\u9879\u7684\u5730\u65b9\uff09\u53ea\u6709\u5728\u4f60\u4e0d\u901a\u8fc7\u5176 for \u5c5e\u6027\u5c06\u5c5e\u6027\u7ed1\u5b9a\u5230\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u65f6\u624d\u6709\u6548\u3002\u5206\u914d\u7ed9 bound \u5c5e\u6027\u7684\u503c\uff08\u751a\u81f3\u662f\u5176\u9ed8\u8ba4\u503c\uff09\u5c06\u8986\u76d6\u8bbe\u7f6e\u6240\u9009\u9879\u7684\u4efb\u4f55\u5176\u4ed6\u5c1d\u8bd5\u3002<\/p>\n
6.3.2 \u7ed1\u5b9a\u591a\u4e2a\u503c<\/h3>\n
\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u60a8\u5df2\u7ecf\u4f7f\u7528\u4e86 select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\uff0c\u4f7f\u7528\u6237\u80fd\u591f\u9009\u62e9\u4e00\u7cfb\u5217\u53ef\u7528\u9009\u9879\u4e4b\u4e00\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u80fd\u5e0c\u671b\u5141\u8bb8\u4ed6\u4eec\u9009\u62e9\u591a\u4e2a\u9009\u9879\u3002\u5f53\u60a8\u4f7f\u7528 HTML \u65f6\uff0c\u53ea\u9700\u5411 select \u5143\u7d20\u6dfb\u52a0\u4e00\u4e2a multiple \u5c5e\u6027\u5373\u53ef\u542f\u7528\u6b64\u529f\u80fd\uff1a<\/p>\n
<select name="cities" multiple><\/code><\/pre>\n
\u5f53\u8fd9\u4e2a\u5c5e\u6027\u5b58\u5728\u65f6\uff0c\u6d4f\u89c8\u5668\u901a\u8fc7\u5448\u73b0\u901a\u5e38\u6240\u8bf4\u7684\u5217\u8868\u6846\u6765\u505a\u51fa\u54cd\u5e94\u2014\u2014\u4e00\u4e2a\u5217\u51fa\u6240\u6709\u9009\u9879\u7684\u6846\uff0c\u5982\u679c\u5185\u5bb9\u8d85\u8fc7\u63a7\u4ef6\u7684\u9ad8\u5ea6\uff0c\u5219\u53ef\u80fd\u6709\u4e00\u4e2a\u6eda\u52a8\u6761\uff08\u56fe 6.10\uff09\u3002\u5728\u5927\u591a\u6570\u6d4f\u89c8\u5668\u4e2d\uff0c\u7528\u6237\u53ef\u4ee5\u5728\u9009\u62e9\u65f6\u6309\u4f4f Ctrl \u952e\u6765\u9009\u62e9\u591a\u4e2a\u9009\u9879\u3002<\/p>\n
<\/p>\n
\u56fe 6.10 \u5e94\u7528\u4e86\u591a\u4e2a\u5c5e\u6027\u7684 Select<\/p>\n
\u5982\u679c\u5c5e\u6027\u7ed1\u5b9a\u5230\u96c6\u5408\uff0c\u5219 select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u4f1a\u81ea\u52a8\u5448\u73b0 Boolean multiple \u5c5e\u6027\u3002\u51c6\u786e\u5730\u8bf4\uff0c\u5b83\u6e32\u67d3 multiple=\u201cmultiple\u201d\uff0c\u4f46\u4ec5\u4ec5\u5b58\u5728 multiple \u5c5e\u6027\u5c31\u662f\u542f\u7528\u591a\u9009\u6240\u9700\u7684\u5168\u90e8\u5185\u5bb9\u3002\u5927\u591a\u6570\u6d4f\u89c8\u5668\u4f1a\u5ffd\u7565\u4f20\u9012\u7ed9 multiple \u5c5e\u6027\u7684\u4efb\u4f55\u503c\u3002<\/p>\n
\u5f53\u7528\u6237\u5230\u8fbe\u7f51\u7ad9\u65f6\uff0c\u4ed6\u4eec\u53ef\u80fd\u8fd8\u6ca1\u6709\u51b3\u5b9a\u8981\u8bbf\u95ee\u54ea\u4e2a\u57ce\u5e02\u3002\u4ed6\u4eec\u53ef\u80fd\u60f3\u8981\u67e5\u770b\u5404\u79cd\u9009\u9879\u3002\u60a8\u53ef\u4ee5\u901a\u8fc7\u5c06 collection \u5c5e\u6027\u7ed1\u5b9a\u5230 select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\uff0c\u4e3a\u5b83\u4eec\u63d0\u4f9b\u4e00\u79cd\u8f7b\u677e\u9009\u62e9\u591a\u4e2a\u9009\u9879\u7684\u65b9\u6cd5\u3002\u8ba9\u6211\u4eec\u901a\u8fc7\u5728\u7f51\u7ad9\u7684\u4e3b\u9875\u4e0a\u4e3a\u7528\u6237\u6dfb\u52a0\u9009\u62e9\u8868\u5355\u6765\u63a2\u8ba8\u8fd9\u4e00\u70b9\u3002\u6253\u5f00 Pages \u6587\u4ef6\u5939\u4e2d\u7684 Index.cshtml.cs \u6587\u4ef6\uff0c\u5e76\u5c06\u4ee5\u4e0b\u516c\u5171\u5c5e\u6027\u6dfb\u52a0\u5230 IndexModel\uff0c\u8868\u793a select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f \uff08int[] SelectedCities\uff09 \u7684\u7ed1\u5b9a\uff0c\u4ee5\u53ca\u5e26\u6709\u6d88\u606f\u7684\u9009\u9879\u3002<\/p>\n
\u6e05\u5355 6.12 \u591a\u9009\u5217\u8868\u7684 PageModel \u5c5e\u6027<\/p>\n
[BindProperty]\n[Display(Name = "Cities")]\npublic int[] SelectedCities { get; set; }\npublic SelectList Cities { get; set; }\npublic string Message { get; set; }<\/code><\/pre>\n
\u73b0\u5728\uff0c\u4ece\u60a8\u4e00\u76f4\u5728\u4f7f\u7528\u7684 Create Property \u9875\u9762\u590d\u5236\u76f8\u540c\u7684\u79c1\u6709 GetCityOptions \u65b9\u6cd5\u4ee5\u751f\u6210 SelectList\uff0c\u5e76\u5c06\u5176\u6dfb\u52a0\u5230 IndexModel\u3002<\/p>\n
\u6e05\u5355 6.13 \u590d\u5236 GetCityOptions \u65b9\u6cd5\u5e76\u5c06\u5176\u6dfb\u52a0\u5230 IndexModel \u4e2d<\/p>\n
private SelectList GetCityOptions()\n{\n    var cities = new List<City>\n    {\n        new City{ Id = 1, Name = "London"},\n        new City{ Id = 2, Name = "Paris" },\n        new City{ Id = 3, Name = "New York" },\n        new City{ Id = 4, Name = "Rome" },\n        new City{ Id = 5, Name = "Dublin" }\n    };\n    return new SelectList(cities, nameof(City.Id), nameof(City.Name));\n}<\/code><\/pre>\n
\u6700\u540e\uff0c\u5728 OnGet \u65b9\u6cd5\u4e2d\u5206\u914d Cities\u3002\u7136\u540e\u6dfb\u52a0\u4e00\u4e2a OnPost \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u4f7f\u7528 SelectedCities \u5c5e\u6027\u4e2d\u7684\u7ed1\u5b9a\u503c\uff0c\u5e76\u5c06\u5176\u7528\u4f5c Cities \u96c6\u5408\u4e0a\u7684\u7b5b\u9009\u5668\uff0c\u4ee5\u63d0\u53d6\u6240\u9009\u57ce\u5e02\u7684\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n
\u793a\u4f8b 6.14 \u5411 IndexModel \u6dfb\u52a0\u5904\u7406\u7a0b\u5e8f\u65b9\u6cd5\u6765\u8bbe\u7f6e city \u9009\u9879<\/p>\n
public void OnGet()\n{\n    Cities = GetCityOptions();\n}\npublic void OnPost()\n{\n    Cities = GetCityOptions();\n    if (ModelState.IsValid)\n    {\n        var cityIds = SelectedCities.Select(x => x.ToString());     \u2776\n        var cities = GetCityOptions().Where(o => cityIds.Contains(o.Value)).Select(o=>o.Text);                       \u2777\n        Message = $"You selected {string.Join(", ", cities)}";      \u2778\n    }\n}<\/code><\/pre>\n
\u2776 \u5c06 int \u7684\u96c6\u5408\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u3002
\n\u2777 \u8fc7\u6ee4\u57ce\u5e02\u9009\u9879\u4ee5\u4ec5\u9009\u62e9\u5df2\u9009\u62e9\u7684\u57ce\u5e02\u9009\u9879\u3002
\n\u2778 \u4f7f\u7528\u5b57\u7b26\u4e32\u3002Join \u65b9\u6cd5\u4ece\u751f\u6210\u7684\u96c6\u5408\u4e2d\u6784\u9020\u6d88\u606f\u3002<\/p>\n
\u73b0\u5728\uff0c\u5c06 Index.cshtml \u4e2d\u7684\u73b0\u6709\u5185\u5bb9\u66ff\u6362\u4e3a\u4e0b\u4e00\u4e2a\u5217\u8868\u4e2d\u663e\u793a\u7684\u7b80\u5355\u8868\u5355\uff0c\u8be5\u8868\u5355\u4ec5\u5305\u542b select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u548c\u4e00\u4e2a\u6309\u94ae\u3002<\/p>\n
Listing 6.15 \u5c06\u8868\u5355\u6dfb\u52a0\u5230\u4e3b\u9875<\/p>\n
<div class="col-4">\n    <form method="post">\n        <div class="mb-3">\n            <label class="form-label" asp-for="SelectedCities"><\/label>\n            <select class="form-control" asp-for="SelectedCities" \n             \u27a5 asp-items="Model.Cities"><\/select>\n        <\/div>\n\n        <div class="mb-3">\n            <button class="btn btn-primary">Submit<\/button>\n        <\/div>\n    <\/form>\n<\/div>\n<p>@Model.Message<\/p><\/code><\/pre>\n
\u8fd0\u884c\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u5f88\u660e\u663e select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7684\u8f93\u51fa\u4e0e\u524d\u9762\u7684\u793a\u4f8b\u4e0d\u540c\uff0c\u56e0\u4e3a\u60a8\u5e94\u8be5\u4f1a\u770b\u5230\u5217\u8868\u6846\u51fa\u73b0\u3002\u5728\u6309\u4f4f Ctrl \u952e\u7684\u540c\u65f6\u9009\u62e9\u51e0\u4e2a\u9009\u9879\uff0c\u7136\u540e\u63d0\u4ea4\u8868\u5355\u3002\u786e\u8ba4\u60a8\u7684\u9009\u62e9\u5df2\u5305\u542b\u5728 Message \u8f93\u51fa\u4e2d\uff0c\u5e76\u4e14\u5b83\u4eec\u5728\u5217\u8868\u6846\u4e2d\u4fdd\u6301\u9009\u4e2d\u72b6\u6001\uff08\u56fe 6.11\uff09\u3002<\/p>\n
<\/p>\n
\u56fe 6.11 \u6240\u9009\u9009\u9879\u4fdd\u6301\u9009\u4e2d\u72b6\u6001\uff0c\u5e76\u5305\u542b\u5728\u5448\u73b0\u7684\u6d88\u606f\u4e2d\u3002<\/p>\n
\u30006.3.3 \u4f7f\u7528 OptGroup<\/h3>\n
SelectList \u7c7b\u5305\u62ec\u53e6\u4e00\u4e2a\u6784\u9020\u51fd\u6570\uff0c\u8be5\u6784\u9020\u51fd\u6570\u4f7f\u60a8\u80fd\u591f\u6307\u5b9a\u5e94\u8be5\u7528\u4e8e\u8868\u793a HTML optgroup \u5143\u7d20\u7684\u5c5e\u6027\u7684\u540d\u79f0\uff0c\u5373 DataGroupField\uff0c\u8be5\u5143\u7d20\u7528\u4e8e\u5728\u5411\u7528\u6237\u663e\u793a\u7684\u9009\u9879\u5217\u8868\u4e2d\u5c06\u76f8\u5173\u9009\u9879\u7ec4\u5408\u5728\u4e00\u8d77\u3002<\/p>\n
\u6bcf\u4e2a\u57ce\u5e02\u90fd\u5c5e\u4e8e\u4e00\u4e2a\u56fd\u5bb6\u3002\u5728 select \u5143\u7d20\u4e2d\u4f7f\u7528\u9009\u9879\u7ec4\u6309\u56fd\u5bb6\/\u5730\u533a\u5bf9\u57ce\u5e02\u9009\u9879\u8fdb\u884c\u5206\u7ec4\u4f3c\u4e4e\u662f\u5408\u7406\u7684\u3002\u5f53\u7528\u6237\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u521b\u5efa\u65b0\u5c5e\u6027\u65f6\uff0c\u4ed6\u4eec\u53ef\u4ee5\u66f4\u8f7b\u677e\u5730\u627e\u5230\u8be5\u5c5e\u6027\u6240\u5728\u7684\u57ce\u5e02\u3002\u56e0\u6b64\uff0c\u8ba9\u6211\u4eec\u5411 City \u7c7b\u6dfb\u52a0\u65b0\u7684\u516c\u5171\u5c5e\u6027\u6765\u8868\u793a\u56fd\u5bb6\/\u5730\u533a\u540d\u79f0\uff1a<\/p>\n
public string CountryName { get; set; }<\/code><\/pre>\n
\u73b0\u5728\uff0c\u60a8\u5c06\u66f4\u6539 Pages\\PropertyManager\\Create .cshtml.cs \u6587\u4ef6\u4e2d\u7684 GetCityOptions \u65b9\u6cd5\uff0c\u4ee5\u5c06\u56fd\u5bb6\/\u5730\u533a\u540d\u79f0\u5206\u914d\u7ed9\u6240\u9009\u57ce\u5e02\uff0c\u7136\u540e\u4f20\u5165 nameof\uff08City.CountryName\uff09 \u6765\u8868\u793a DataGroupField\u3002<\/p>\n
Listing 6.16 \u5411 city \u9009\u9879\u6dfb\u52a0\u4e00\u4e2a\u9009\u9879\u7ec4<\/p>\n
private SelectList GetCityOptions()\n{\n    var cities = new List<City>\n    {\n        new City{ Id = 1, Name = "Barcelona" , CountryName = "Spain" },\n        new City{ Id = 2, Name = "Cadiz" , CountryName = "Spain" },\n        new City{ Id = 3, Name = "London", CountryName = "United Kingdom" },\n        new City{ Id = 4, Name = "Madrid" , CountryName = "Spain" },\n        new City{ Id = 5, Name = "Rome", CountryName = "Italy" },\n        new City{ Id = 6, Name = "Venice", CountryName = "Italy" },\n        new City{ Id = 7, Name = "York" , CountryName = "United Kingdom" },\n    };\n    return new SelectList(cities, nameof(City.Id), nameof(City.Name), \n    \u27a5 null, nameof(City.CountryName));\n}<\/code><\/pre>\n
\u5f53\u60a8\u8fd0\u884c\u8be5\u9875\u9762\u65f6\uff0c\u60a8\u5e94\u8be5\u4f1a\u770b\u5230\u6309\u56fd\u5bb6\/\u5730\u533a\u5206\u7ec4\u7684\u6570\u636e\uff0c\u5e76\u5c06\u56fd\u5bb6\/\u5730\u533a\u540d\u79f0\u8bbe\u7f6e\u4e3a\u5206\u7ec4\u6807\u7b7e\uff08\u56fe 6.12\uff09\u3002\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u60a8\u5c06\u4ee5\u9762\u5411\u5bf9\u8c61\u7684\u65b9\u5f0f\u5904\u7406\u6570\u636e\u3002\u60a8\u5df2\u7ecf\u6709\u4e00\u4e2a Country \u7c7b\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u5411 City \u7c7b\u6dfb\u52a0 Country \u5c5e\u6027\uff08\u5728\u4e0b\u9762\u7684\u6e05\u5355\u4e2d\u4ee5\u7c97\u4f53\u663e\u793a\uff09\u6765\u4f7f\u7528\u7ec4\u5408\u6765\u8868\u793a\u57ce\u5e02\u548c\u56fd\u5bb6\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n
<\/p>\n
\u56fe 6.12 \u57ce\u5e02\u6309\u56fd\u5bb6\u5206\u7ec4\u3002<\/p>\n
\u6e05\u5355 6.17 \u5c06 CountryName \u5c5e\u6027\u66ff\u6362\u4e3a Country \u5c5e\u6027<\/p>\n
public class City\n{\n    public int Id { get; set; }\n    public string Name { get; set; }\n    public Country Country { get; set; }     \u2776\n}<\/code><\/pre>\n
\u2776 \u5c06\u5b57\u7b26\u4e32\u5c5e\u6027\u66ff\u6362\u4e3a Country \u5c5e\u6027\u3002<\/p>\n
\u4e0b\u4e00\u4e2a\u6e05\u5355\u663e\u793a\u4e86 GetCityOptions \u65b9\u6cd5\u7684\u4fee\u8ba2\u7248\u672c\uff0c\u5176\u4e2d\u56fd\u5bb6\/\u5730\u533a\u540d\u79f0\u662f\u901a\u8fc7 Country \u5c5e\u6027\u8bbe\u7f6e\u7684\u3002<\/p>\n
Listing 6.18 \u4f7f\u7528\u7ec4\u5408\u4e3a\u6bcf\u4e2a\u57ce\u5e02\u8bbe\u7f6e\u56fd\u5bb6<\/p>\n
private SelectList GetCityOptions()\n{\n    var cities = new List<City>\n    {\n        new City{ Id = 1, Name = "London", Country = new Country{\n                  \u27a5 CountryName = "United Kingdom"} },\n        new City{ Id = 2, Name = "York" , Country = new Country{\n                  \u27a5 CountryName = "United Kingdom"} },\n        new City{ Id = 3, Name = "Venice", Country = new Country{\n                  \u27a5 CountryName = "Italy"} },\n        new City{ Id = 4, Name = "Rome", Country = new Country{\n                  \u27a5 CountryName = "Italy" } },\n        new City{ Id = 5, Name = "Madrid" , Country = new Country{\n                  \u27a5 CountryName = "Spain" } },\n        new City{ Id = 5, Name = "Barcelona" , Country = new Country{\n                  \u27a5 CountryName = "Spain" } },\n        new City{ Id = 5, Name = "Cadiz" , Country = new Country{\n                  \u27a5 CountryName = "Spain" } }\n    };\n    return new SelectList(cities, nameof(City.Id), nameof(City.Name), \n                          \u27a5 null, "Country.CountryName");               \u2776\n}<\/code><\/pre>\n
\u2776 \u5728\u5904\u7406\u590d\u6742\u5bf9\u8c61\u65f6\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u6587\u672c\u5b57\u7b26\u4e32\u6765\u8868\u793a DataGroupField\u3002<\/p>\n
\u8fd9\u4e00\u6b21\uff0c\u60a8\u4e0d\u80fd\u4f7f\u7528 nameof \u8fd0\u7b97\u7b26\u6765\u8868\u793a DataGroupField \u540d\u79f0\u3002\u60a8\u5fc5\u987b\u5c06\u5b8c\u6574\u7684\u5c5e\u6027\u540d\u79f0\u4f5c\u4e3a\u5b57\u7b26\u4e32\u4f20\u5165;\u5426\u5219\uff0c\u5c06\u627e\u4e0d\u5230\u5b83\uff0c\u4ece\u800c\u5bfc\u81f4\u5728\u8fd0\u884c\u65f6\u51fa\u73b0 NullReferenceException\u3002<\/p>\n
6.3.4 \u7ed1\u5b9a\u679a\u4e3e<\/h3>\n
\u5728\u5927\u591a\u6570\u5b9e\u9645\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u60a8\u586b\u5145\u9009\u62e9\u5217\u8868\u7684\u9009\u9879\u5c06\u6765\u81ea\u6570\u636e\u5e93\uff0c\u5c24\u5176\u662f\u5728\u5b83\u4eec\u53ef\u80fd\u66f4\u6539\u7684\u60c5\u51b5\u4e0b\u3002\u5f53\u9009\u9879\u7684\u8303\u56f4\u81ea\u7136\u53d7\u5230\u9650\u5236\u65f6\uff0c\u60a8\u53ef\u4ee5\u51b3\u5b9a\u7531\u679a\u4e3e\u4ee3\u66ff\u5b83\u4eec\u3002\u4f8b\u5982\uff0c\u5408\u7406\u63cf\u8ff0\u4ed6\u4eec\u7684\u5de5\u4f5c\u72b6\u6001\u7684\u65b9\u5f0f\u6709\u9650\uff1a\u5168\u804c\u5c31\u4e1a\u3001\u517c\u804c\u5c31\u4e1a\u3001\u81ea\u96c7\u3001\u627e\u5de5\u4f5c\u3001\u9000\u4f11\u6216\u63a5\u53d7\u6559\u80b2\u3002\u56e0\u6b64\uff0c\u60a8\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a WorkStatus \u7684\u679a\u4e3e\uff0c\u5176\u4e2d\u5305\u542b\u8868\u793a\u6240\u6709\u53ef\u80fd\u9009\u9879\u7684\u6210\u5458\u3002<\/p>\n
\u5728\u60a8\u7684\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u5e94\u7528\u4e8e\u53ef\u4ee5\u4fdd\u7559\u7684\u5c5e\u6027\u7684\u8bc4\u7ea7\u662f\u679a\u4e3e\u7684\u826f\u597d\u5019\u9009\u9879\u3002\u8bc4\u5206\u8303\u56f4\u4ece 1 \u661f\u5230 5 \u661f\u4e0d\u7b49\uff0c\u60a8\u8fd8\u5fc5\u987b\u5904\u7406\u5c1a\u672a\u8bc4\u7ea7\u7684\u623f\u4ea7\u3002\u56e0\u6b64\uff0c\u60a8\u5c06\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u6db5\u76d6\u6240\u6709\u9009\u9879\u7684\u6210\u5458\u7684\u679a\u4e3e\u3002\u5c06\u65b0\u7684 C# \u7c7b\u6587\u4ef6\u6dfb\u52a0\u5230\u540d\u4e3a Rating.cs \u7684 Models \u6587\u4ef6\u5939\u4e2d\uff0c\u5e76\u5c06\u8be5\u7c7b\u66f4\u6539\u4e3a\u679a\u4e3e\u3002<\/p>\n
Listing 6.19 Rating \u679a\u4e3e<\/p>\n
public enum Rating\n{\n    Unrated, OneStar, TwoStar, ThreeStar, FourStar, FiveStar      \n}<\/code><\/pre>\n
\u4e0b\u4e00\u6b65\u662f\u5c06\u5c5e\u6027\u6dfb\u52a0\u5230 PropertyManager \u6587\u4ef6\u5939\u4e2d\u7684 CreateModel\uff1a<\/p>\n
[BindProperty]\npublic Rating Rating { get; set; }<\/code><\/pre>\n
\u60a8\u5e0c\u671b\u80fd\u591f\u5728 Razor \u9875\u9762\u4e2d\u5f15\u7528\u6b64\u7c7b\u578b\uff0c\u56e0\u6b64\u9700\u8981\u4f7f\u5176\u53ef\u4ee5\u4f7f\u7528 CityBreaks.Models \u547d\u540d\u7a7a\u95f4\u3002\u5982\u679c\u60a8\u56de\u60f3\u4e00\u4e0b\u7b2c 3 \u7ae0\uff0c\u60a8\u4f1a\u8bb0\u5f97\u60a8\u53ef\u4ee5\u901a\u8fc7\u5411 ViewImports \u6587\u4ef6\u6dfb\u52a0\u5408\u9002\u7684 using \u6307\u4ee4\u6765\u5168\u5c40\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u56e0\u6b64\u6253\u5f00 Pages \u6587\u4ef6\u5939\u4e2d\u7684\u90a3\u4e2a\u6307\u4ee4\uff0c\u5e76\u901a\u8fc7\u5728\u4e0b\u9762\u7684\u5217\u8868\u4e2d\u6dfb\u52a0\u7c97\u4f53\u4ee3\u7801\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002<\/p>\n
\u6e05\u5355 6.20 \u5411 ViewImports \u6dfb\u52a0 using \u6307\u4ee4<\/p>\n
@using CityBreaks\n@using CityBreaks.Models\n@namespace CityBreaks.Pages\n@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers<\/code><\/pre>\n
\u63d0\u4f9b\u4e86 Html.GetEnumSelectList \u65b9\u6cd5\uff0c\u56e0\u6b64\u60a8\u53ef\u4ee5\u8f7b\u677e\u5730\u5c06\u679a\u4e3e\u7ed1\u5b9a\u4e3a\u9009\u62e9\u5217\u8868\u7684\u6570\u636e\u6e90\u3002\u60a8\u5c06\u5728\u5c06\u6dfb\u52a0\u5230\u201c\u521b\u5efa\u5c5e\u6027\u201d\u8868\u5355\u7684 select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7684 asp-items \u5c5e\u6027\u4e2d\u4f7f\u7528\u8be5\u65b9\u6cd5\u3002\u5728 select city \u5217\u8868\u4e4b\u540e\u6dfb\u52a0\u4ee5\u4e0b\u4ee3\u7801\u5757\u3002<\/p>\n
\u6e05\u5355 6.21 \u4f7f\u7528 Html.GetEnumSelectList \u65b9\u6cd5\u7ed1\u5b9a\u679a\u4e3e<\/p>\n
<div class="mb-3">\n    <label asp-for="Rating"><\/label>\n    <select class="form-control" asp-for="Rating" asp-items="Html.GetEnumSelectList<Rating>()"><\/select>\n<\/div><\/code><\/pre>\n
\u8fd0\u884c\u9875\u9762\u3002\u679a\u4e3e\u503c\u5e94\u51fa\u73b0\u5728\u9009\u62e9\u5217\u8868\u4e2d\uff08\u56fe 6.13\uff09\u3002<\/p>\n
<\/p>\n
\u56fe 6.13 \u901a\u8fc7 Html.GetEnumSelectList \u65b9\u6cd5\u7ed1\u5b9a\u5230 select list \u7684\u679a\u4e3e<\/p>\n
\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u9009\u62e9\u4e86 Unrated \u9009\u9879\u3002\u60a8\u53ef\u4ee5\u68c0\u67e5\u9875\u9762\u7684\u6e90\u4ee3\u7801\u4ee5\u786e\u8ba4\u8fd9\u4e00\u4e8b\u5b9e\u3002\u8fd9\u662f\u56e0\u4e3a\u5176\u9009\u9879\u503c \uff08\u96f6\uff09 \u662f Rating \u7684\u9ed8\u8ba4\u503c\u3002\u5982\u679c\u4e0d\u5e0c\u671b\u9884\u5148\u9009\u62e9\u8be5\u503c\uff0c\u53ef\u4ee5\u5c06 PageModel \u5c5e\u6027\u8bbe\u7f6e\u4e3a\u53ef\u4e3a null\uff1a<\/p>\n
[BindProperty]\npublic Rating? Rating { get; set; }<\/code><\/pre>\n
\u56de\u60f3\u4e00\u4e0b\u4e0a\u4e00\u7ae0\uff0c\u5982\u679c\u4f60\u4f7f\u5c5e\u6027\u53ef\u4e3a\u7a7a\uff0c\u4f46\u4f60\u4ecd\u7136\u5e0c\u671b\u4f7f\u5173\u8054\u7684\u8868\u5355\u63a7\u4ef6\u6210\u4e3a\u5fc5\u586b\u5b57\u6bb5\uff0c\u4f60\u5c06\u9700\u8981\u6dfb\u52a0\u4e00\u4e2a Required \u5c5e\u6027\u3002<\/p>\n
\u5448\u73b0\u7ed9\u7528\u6237\u7684\u5b9e\u9645\u503c\u53ef\u4ee5\u7a0d\u4f5c\u6574\u7406\u3002\u5982\u679c\u60a8\u4ee5\u524d\u4f7f\u7528\u8fc7\u679a\u4e3e\uff0c\u5219\u53ef\u80fd\u4f1a\u60f3\u5c06 Description \u5c5e\u6027\u5e94\u7528\u4e8e\u60a8\u5e0c\u671b\u66f4\u52a0\u7528\u6237\u53cb\u597d\u7684\u6bcf\u4e2a\u6210\u5458\u3002\u4f46\u662f\uff0c\u8fd9\u4e0d\u4f1a\u5f71\u54cd select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u3002\u5c31\u50cf\u5176\u4ed6\u4e0e\u8868\u5355\u76f8\u5173\u7684\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u4e00\u6837\uff0cselect \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u54cd\u5e94 DisplayAttribute\u3002\u4e0b\u9762\u7684\u6e05\u5355\u6f14\u793a\u4e86\u5982\u4f55\u5c06\u5176\u5e94\u7528\u4e8e\u60a8\u5e0c\u671b\u5411\u7528\u6237\u663e\u793a\u539f\u59cb\u5c5e\u6027\u540d\u79f0\u4ee5\u5916\u7684\u5185\u5bb9\u7684\u6bcf\u4e2a\u6210\u5458\u3002<\/p>\n
\u6e05\u5355 6.22 \u4f7f\u7528 DisplayAttribute \u66f4\u6539\u663e\u793a\u7684\u503c<\/p>\n
public enum Rating\n{\n    Unrated,\n    [Display(Name="1 Star")]\n    OneStar,\n    [Display(Name = "2 Star")]\n    TwoStar,\n    [Display(Name = "3 Star")]\n    ThreeStar,\n    [Display(Name = "4 Star")]\n    FourStar,\n    [Display(Name = "5 Star")]\n    FiveStar      \n}<\/code><\/pre>\n
\u6e32\u67d3\u7684\u7ed3\u679c\u5982\u56fe 6.14 \u6240\u793a\u3002<\/p>\n
<\/p>\n
\u56fe 6.14 \u663e\u793a\u540d\u79f0\u4f1a\u81ea\u52a8\u5e94\u7528\u4e8e\u9009\u9879\u6587\u672c\u3002<\/p>\n
\u73b0\u5728\u6211\u4eec\u5df2\u7ecf\u4ecb\u7ecd\u4e86\u4f7f\u7528\u9009\u62e9\u5217\u8868\u65f6\u51fa\u73b0\u7684\u6700\u5e38\u89c1\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u7ee7\u7eed\u67e5\u770b\u590d\u9009\u6846\u548c\u5355\u9009\u6309\u94ae\u63a7\u4ef6\u3002\u867d\u7136 input \u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u4ee5\u4ed6\u4eec\u4e3a\u76ee\u6807\uff0c\u4f46\u4ed6\u4eec\u884c\u4e3a\u7684\u5404\u4e2a\u65b9\u9762\u662f\u72ec\u4e00\u65e0\u4e8c\u7684\uff0c\u503c\u5f97\u5173\u6ce8\u3002<\/p>\n
6.4 \u590d\u9009\u6846\u548c\u65e0\u7ebf\u7535\u63a7\u5236<\/h2>\n
\u6211\u4eec\u5df2\u7ecf\u4ecb\u7ecd\u4e86\u5728 Razor Pages \u8868\u5355\u4e2d\u4f7f\u7528\u590d\u9009\u6846\u7684\u4e00\u4e9b\u65b9\u9762\uff0c\u4f46\u503c\u5f97\u91cd\u590d\u8fd9\u4e9b\u77e5\u8bc6\uff0c\u540c\u65f6\u6211\u4eec\u5c06\u63a2\u7d22\u4f7f\u7528\u7c7b\u4f3c\u7684\u63a7\u4ef6\uff1a\u5355\u9009\u6309\u94ae\u3002\u590d\u9009\u6846\u65e8\u5728\u4f7f\u7528\u6237\u80fd\u591f\u4ece\u9884\u5b9a\u4e49\u9009\u9879\uff08\u5982\u9009\u62e9\u5217\u8868\uff09\u4e2d\u8fdb\u884c\u9009\u62e9\u96f6\u4e2a\u6216\u591a\u4e2a\u3002\u590d\u9009\u6846\u53ef\u4ee5\u5355\u72ec\u8868\u793a\u5e03\u5c14\u9009\u9879\uff0c\u5f53\u8fd9\u662f\u8981\u6c42\u65f6\uff0c\u60a8\u5e94\u8be5\u5c06 PageModel \u5c5e\u6027\u7ed1\u5b9a\u5230\u5b83\u4eec\uff0c\u8be5\u5c5e\u6027\u53ef\u4ee5\u662f\u5e03\u5c14\u503c\u6216\u5b57\u7b26\u4e32\uff0c\u5176\u503c\u53ef\u4ee5\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\uff08\u4f8b\u5982\uff0c\u201ctrue\u201d\/\u201cfalse\u201d\uff09\u3002\u8fd8\u53ef\u4ee5\u901a\u8fc7\u5171\u4eab\u76f8\u540c\u7684\u540d\u79f0\u5c06\u590d\u9009\u6846\u7ec4\u5408\u5728\u4e00\u8d77\uff0c\u4ee5\u4f7f\u7528\u6237\u80fd\u591f\u8fdb\u884c\u591a\u9879\u9009\u62e9\uff0c\u4f8b\u5982\u60a8\u521a\u521a\u4f7f\u7528\u7684\u5217\u8868\u6846\u3002\u5728\u4e0a\u4e00\u7ae0\u4e2d\uff0c\u4f60\u67e5\u770b\u4e86\u6a21\u578b\u7ed1\u5b9a\u5230\u7b80\u5355\u96c6\u5408\u65f6\u6240\u505a\u7684\u3002\u60a8\u662f\u9009\u62e9\u4f7f\u7528\u5217\u8868\u6846\u8fd8\u662f\u4e00\u7ec4\u590d\u9009\u6846\u6765\u4fc3\u8fdb\u591a\u9009\uff0c\u4e0e\u4efb\u4f55\u4e8b\u60c5\u4e00\u6837\uff0c\u90fd\u662f\u4e00\u4e2a\u6f14\u793a\u6587\u7a3f\u8bbe\u8ba1\u51b3\u7b56\u3002<\/p>\n
\u5355\u9009\u63a7\u4ef6\u8868\u793a\u4e92\u65a5\u7684\u9009\u9879\u3002\u5b83\u4eec\u4e3b\u8981\u7528\u4e8e\u5141\u8bb8\u7528\u6237\u4ece\u591a\u4e2a\u9009\u9879\u4e2d\u9009\u62e9\u4e00\u4e2a\uff0c\u5e76\u4e14\u53ea\u80fd\u9009\u62e9\u4e00\u4e2a\u3002\u56e0\u6b64\uff0c\u5b83\u4eec\u51e0\u4e4e\u603b\u662f\u88ab\u5f52\u4e3a\u4e00\u7ec4\u3002\u5f53\u9009\u62e9\u7ec4\u4e2d\u7684\u4e00\u4e2a\u5355\u9009\u6309\u94ae\u65f6\uff0c\u5c06\u81ea\u52a8\u53d6\u6d88\u9009\u62e9\u6240\u6709\u5176\u4ed6\u5355\u9009\u6309\u94ae\u3002\u60a8\u4e0d\u80fd\u53d6\u6d88\u9009\u62e9\u5355\u4e2a\u65e0\u7ebf\u7535\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5b83\u4eec\u4e0d\u80fd\u771f\u6b63\u5355\u72ec\u4f7f\u7528\u7684\u539f\u56e0\u3002\u53d6\u6d88\u9009\u62e9\u4e00\u4e2a\u65e0\u7ebf\u7535\u7684\u552f\u4e00\u65b9\u6cd5\u662f\u9009\u62e9\u540c\u4e00\u7ec4\u4e2d\u7684\u53e6\u4e00\u4e2a\u65e0\u7ebf\u7535\u3002\u4ee5\u5f3a\u5236\u9009\u62e9\u7684\u5f62\u5f0f\u4f7f\u7528\u4e00\u4e2a\u65e0\u7ebf\u7535\u63a7\u4ef6\u53ef\u80fd\u662f\u6709\u610f\u4e49\u7684\uff0c\u4f8b\u5982\u5728\u7ee7\u7eed\u4e4b\u524d\u8868\u660e\u60a8\u540c\u610f\u6761\u6b3e\u548c\u6761\u4ef6\u3002<\/p>\n
\u5728\u4e0b\u4e00\u4e2a\u793a\u4f8b\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528\u5355\u9009\u6309\u94ae\u800c\u4e0d\u662f select \u5143\u7d20\u6765\u9009\u62e9\u5c5e\u6027\u8bc4\u7ea7\u679a\u4e3e\u503c\u4e4b\u4e00\u3002\u552f\u4e00\u9700\u8981\u7684\u66f4\u6539\u662f\u8868\u5355\u672c\u8eab\u3002\u5c06 select \u5143\u7d20\u66ff\u6362\u4e3a\u4e0b\u4e00\u4e2a\u6e05\u5355\u4e2d\u7684\u4ee3\u7801\u3002<\/p>\n
Listing 6.23 \u5c06\u4e00\u4e2a select \u5143\u7d20\u66ff\u6362\u4e3a\u4e00\u7ec4 radio \u63a7\u4ef6<\/p>\n
<p>Rating<\/p>\n<ul class="list-group border-0">\n@foreach(var option in Html.GetEnumSelectList<Rating>())       \u2776\n{\n    <li class="list-group-item p-0 border-0">\n        <input asp-for="Rating" type="radio" \n         \u27a5 id="rating-@option.Value" value="@option.Value">   \u2777\n        <label for="rating-@option.Value">\n         \u27a5 @option.Text<\/label>                               \u2778\n    <\/li>\n}\n<\/ul><\/code><\/pre>\n
\u2776 \u4f7f\u7528 Html.GetEnumSelectList \u65b9\u6cd5\u5c06\u679a\u4e3e\u8f6c\u6362\u4e3a IEnumerable\uff0c\u5e76\u5faa\u73af\u8bbf\u95ee\u5b83\u4eec\u3002
\n\u2777 \u5c06\u5355\u9009\u6309\u94ae\u7ed1\u5b9a\u5230 Rating \u5c5e\u6027\uff0c\u4f46\u663e\u5f0f\u8bbe\u7f6e type\u3001id \u548c value\u3002
\n\u2778 \u6dfb\u52a0\u6807\u7b7e\uff0c\u5e76\u5c06\u5176 for \u5c5e\u6027\u8bbe\u7f6e\u4e3a\u76f8\u5e94\u5355\u9009\u6309\u94ae\u7684 id\u3002<\/p>\n
Html.GetEnumSelectList \u65b9\u6cd5\u53ef\u7528\u4e8e Razor \u9875\u9762\u4e2d\u7684\u4efb\u4f55\u4f4d\u7f6e\uff0c\u4ee5\u5c06\u679a\u4e3e\u8f6c\u6362\u4e3a IEnumerable<SelectListItem><\/code>\u3002\u60a8\u53ef\u4ee5\u8fed\u4ee3\u8fd9\u4e9b\u5e76\u4e3a\u6bcf\u4e2a API \u5448\u73b0\u4e00\u4e2a Input\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u8f93\u5165\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7684 for \u5c5e\u6027\u5c06\u5355\u9009\u6309\u94ae\u63a7\u5236\u7ec4\u7ed1\u5b9a\u5230 Rating \u5c5e\u6027\uff0c\u4f46\u5fc5\u987b\u4f7f\u7528\u6b64\u8f93\u5165\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u663e\u5f0f\u8bbe\u7f6e\u7c7b\u578b\u3002\u6ca1\u6709\u4ece .NET \u7c7b\u578b\u5230\u65e0\u7ebf\u7535\u63a7\u4ef6\u7684\u6620\u5c04\u3002\u5f53\u60a8\u5728\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u4e0a\u663e\u5f0f\u8bbe\u7f6e HTML \u5c5e\u6027\u65f6\uff0c\u6807\u7b7e\u5e2e\u52a9\u7a0b\u5e8f\u5c06\u9075\u5faa\u60a8\u7684\u5206\u914d\u3002\u60a8\u5bf9 id \u5c5e\u6027\u6267\u884c\u4e86\u76f8\u540c\u7684\u4f5c\uff0c\u8be5\u5c5e\u6027\u901a\u5e38\u7531 tag helper \u751f\u6210\u3002\u60a8\u9700\u8981\u81ea\u5df1\u8bbe\u7f6e\u8be5\u503c\u3002\u5426\u5219\uff0c\u6240\u6709\u8f93\u5165\u90fd\u5c06\u5177\u6709\u76f8\u540c\u7684\u81ea\u52a8\u751f\u6210\u7684 ID \u201cRating\u201d\uff0c\u5e76\u4e14\u60a8\u4e0d\u80fd\u5728\u540c\u4e00\u6587\u6863\u4e2d\u62e5\u6709\u5177\u6709\u76f8\u540c ID \u503c\u7684\u591a\u4e2a\u5143\u7d20\u3002\u56e0\u6b64\uff0c\u901a\u8fc7\u5c06\u8bc4\u7ea7\u7684\u6570\u503c\u8fde\u63a5\u5230 \u201crating-\u201d\uff0c\u751f\u6210 \u201crating-0\u201d\u3001\u201crating-1\u201d \u7b49\uff0c\u4ece\u800c\u6784\u5efa\u4e86\u552f\u4e00\u503c\u3002\u56fe 6.15 \u663e\u793a\u4e86\u5355\u9009\u6309\u94ae\u7684\u6700\u7ec8\u6e32\u67d3\u96c6\u5408\u3002<\/p>\n
<\/p>\n
\u56fe 6.15 \u57fa\u4e8e\u679a\u4e3e\u6e32\u67d3\u7684\u65e0\u7ebf\u7535<\/p>\n
\u6211\u5728\u6b64\u5904\u4f7f\u7528\u4e86 Html.GetEnumSelectList \u6765\u751f\u6210\u9002\u5408\u5728 Razor \u9875\u9762\u4e2d\u4f7f\u7528\u7684\u7c7b\u578b\u7684\u96c6\u5408\uff0c\u56e0\u4e3a\u8fd4\u56de\u7c7b\u578b IEnumerable <SelectListItem><\/code> \u53ef\u4ee5\u66f4\u8f7b\u677e\u5730\u5c06\u679a\u4e3e\u503c\u7ed1\u5b9a\u5230\u65e0\u7ebf\u7535\u3002\u6570\u636e\u53ef\u4ee5\u7531\u4efb\u4f55\u7c7b\u578b\u8868\u793a\uff0c\u8fd9\u4e9b\u7c7b\u578b\u516c\u5f00\u4e86\u53ef\u4ee5\u6620\u5c04\u5230\u8f93\u5165\u503c\u7684\u5c5e\u6027\uff0c\u4ee5\u53ca\u67d0\u79cd\u7c7b\u578b\u7684\u63cf\u8ff0\u6027\u6807\u7b7e\u3002<\/p>\n
6.5 \u4e0a\u4f20\u6587\u4ef6<\/h2>\n
\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u60a8\u5c06\u4f7f\u7528\u8868\u5355\u5c06\u7528\u6237\u7684\u6570\u636e\u4f5c\u4e3a\u7b80\u5355\u5b57\u7b26\u4e32\u6355\u83b7\uff0c\u5c3d\u7ba1\u5728\u670d\u52a1\u5668\u4e0a\uff0c\u5b83\u4eec\u53ef\u80fd\u4f1a\u8f6c\u6362\u4e3a\u6570\u5b57\u3001DateTime \u6216\u5e03\u5c14\u503c\u3002\u8868\u5355\u8fd8\u53ef\u7528\u4e8e\u5c06\u4e8c\u8fdb\u5236\u6570\u636e\u53d1\u9001\u5230\u670d\u52a1\u5668\uff0c\u4ece\u800c\u53ef\u4ee5\u4e0a\u4f20\u6587\u4ef6\u3002\u8981\u5c06\u6a21\u578b\u7ed1\u5b9a\u4e0e\u6210\u529f\u4e0a\u4f20\u6587\u4ef6\u76f8\u7ed3\u5408\uff0c\u60a8\u5fc5\u987b\u6ee1\u8db3\u4e09\u4e2a\u57fa\u672c\u8981\u6c42\uff1a<\/p>\n
    \n
  1. \u8868\u5355\u5fc5\u987b\u4f7f\u7528 POST \u65b9\u6cd5\u3002<\/li>\n
  2. \u8868\u5355\u5fc5\u987b\u5c06 enctype \u5c5e\u6027\u8bbe\u7f6e\u4e3a multipart\/form-data\u3002<\/li>\n
  3. \u5982\u679c\u8981\u542f\u7528\u591a\u4e2a\u6587\u4ef6\u4e0a\u4f20\uff0c\u5219\u4e0a\u4f20\u7684\u6587\u4ef6\u5fc5\u987b\u6620\u5c04\u5230 IFormFile \u7c7b\u578b\u7684\u5b9e\u4f8b\u6216\u5b83\u4eec\u7684\u96c6\u5408\u3002<\/li>\n<\/ol>\n
    IFormFile \u63a5\u53e3\u4f4d\u4e8e Microsoft.AspNetCore.Http \u547d\u540d\u7a7a\u95f4\u4e2d\uff0c\u8868\u793a\u901a\u8fc7 HTTP \u53d1\u9001\u7684\u6587\u4ef6\u3002\u9664\u4e86\u4e00\u4e9b\u63d0\u4f9b\u5bf9\u6587\u4ef6\u76f8\u5173\u4fe1\u606f\uff08\u5176 FileName\u3001Length\u3001ContentType \u7b49\uff09\u7684\u8bbf\u95ee\u7684\u5c5e\u6027\u5916\uff0cIFormFile \u63a5\u53e3\u8fd8\u6307\u5b9a\u4e86\u51e0\u79cd\u5c06\u5185\u5bb9\u590d\u5236\u5230 Stream \u7684\u65b9\u6cd5\uff0c\u4ee5\u4fbf\u60a8\u53ef\u4ee5\u4fdd\u5b58\u5b83\u3002<\/p>\n
    \u5728 Razor Pages \u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u53ef\u4ee5\u5c06\u6587\u4ef6\u4ee5\u4e8c\u8fdb\u5236\u5f62\u5f0f\u672c\u5730\u4fdd\u5b58\u5230\u6570\u636e\u5e93\uff0c\u4e5f\u53ef\u4ee5\u5c06\u5176\u4fdd\u5b58\u5230\u6587\u4ef6\u7cfb\u7edf\u3002\u8fc7\u53bb\u66fe\u7206\u53d1\u8fc7\u5b97\u6559\u6218\u4e89\uff0c\u4e89\u8bba\u54ea\u79cd\u65b9\u6cd5\u66f4\u597d\uff01\u901a\u8fc7\u4e00\u4e9b\u641c\u7d22\uff0c\u60a8\u53ef\u4ee5\u5728\u4e92\u8054\u7f51\u4e0a\u627e\u5230\u8fd9\u4e9b\u5386\u53f2\u6218\u573a\u7684\u9057\u8ff9\u3002\u6218\u6597\u5f80\u5f80\u8086\u8650\u7684\u5c71\u4e18\u4e0e\u50a8\u5b58\u548c\u52a0\u5de5\u6210\u672c\u6709\u5173\u3002\u7531\u4e8e\u73b0\u5728\u4e24\u8005\u90fd\u76f8\u5bf9\u4fbf\u5b9c\uff0c\u56e0\u6b64\u73b0\u5728\u66f4\u53ef\u80fd\u57fa\u4e8e\u53ef\u8bbf\u95ee\u6027\u548c\u5b89\u5168\u6027\u6765\u51b3\u5b9a\u5b58\u50a8\u4f4d\u7f6e\u3002\u5982\u679c\u60a8\u5e0c\u671b\u80fd\u591f\u51fa\u4e8e\u4efb\u4f55\u539f\u56e0\u5feb\u901f\u8bbf\u95ee\u4e0a\u4f20\u7684\u6587\u4ef6\uff0c\u90a3\u4e48\u6587\u4ef6\u7cfb\u7edf\u662f\u6709\u610f\u4e49\u7684\u3002\u5982\u679c\u60a8\u5b58\u50a8\u7684\u6587\u6863\u662f\u654f\u611f\u7684\uff0c\u5219\u53ef\u80fd\u9700\u8981\u5229\u7528\u6570\u636e\u5e93\u7cfb\u7edf\u63d0\u4f9b\u7684\u5185\u7f6e\u5b89\u5168\u529f\u80fd\u3002<\/p>\n
    \u6587\u4ef6\u4e0a\u4f20\u7684\u5371\u9669<\/h2>\n
    \u5141\u8bb8\u5c06\u6587\u4ef6\u4e0a\u4f20\u5230\u60a8\u7684\u5e94\u7528\u7a0b\u5e8f\u5b58\u5728\u5371\u9669\u3002\u81f3\u5c11\uff0c\u6587\u4ef6\u4e0a\u4f20\u4e3a\u6076\u610f\u7528\u6237\u63d0\u4f9b\u4e86\u4e00\u79cd\u5c06\u6076\u610f\u8f6f\u4ef6\u4e0a\u4f20\u5230\u60a8\u7684 Web \u670d\u52a1\u5668\u7684\u65b9\u6cd5\u3002\u60a8\u5e94\u8be5\u82b1\u4e00\u4e9b\u65f6\u95f4\u67e5\u770b\u5f00\u653e Web \u5e94\u7528\u7a0b\u5e8f\u5b89\u5168\u9879\u76ee \uff08OWASP;http:\/\/mng.bz\/aJx7\uff09\u4e86\u89e3\u60a8\u53ef\u80fd\u4f1a\u9762\u4e34\u7684\u6f5c\u5728\u95ee\u9898\u4ee5\u53ca\u60a8\u5e94\u8be5\u5b9e\u65bd\u7684\u7f13\u89e3\u63aa\u65bd\u6765\u4fdd\u62a4\u81ea\u5df1<\/a>\u3002
    \n\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u65e9\u671f\u7248\u672c\u7684 ASP.NET \u8fd0\u884c\u65f6\u5c06 HTTP \u8bf7\u6c42\u7684\u6700\u5927\u5927\u5c0f\u9650\u5236\u4e3a 4 MB\uff0c\u4ee5\u5e2e\u52a9\u9632\u6b62\u56e0 Web \u670d\u52a1\u5668\u56e0\u8fc7\u591a\u7684\u6570\u636e\u800c\u65e0\u6cd5\u5728\u5185\u5b58\u4e2d\u5904\u7406\u800c\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1 \uff08DOS\uff09 \u653b\u51fb\u3002\u5728 ASP.NET Core \u4e2d\uff0cKestrel Web \u670d\u52a1\u5668\u7684\u8bf7\u6c42\u957f\u5ea6\u9650\u5236\u4e3a 30 MB\u3002\u60a8\u53ef\u4ee5\u901a\u8fc7\u5c06 RequestSizeLimit \u5c5e\u6027\u5e94\u7528\u4e8e PageMode \u7c7b\u6765\u5b9e\u73b0\u4e0b\u9650\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e2a\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u7684\u503c\uff0c\u8be5\u503c\u8868\u793a\u8bf7\u6c42\u7684\u6700\u5927\u5141\u8bb8\u5927\u5c0f\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u5c06\u5bf9\u603b\u8bf7\u6c42\u5f3a\u5236\u5b9e\u65bd 1 MB \u7684\u9650\u5236\uff1a<\/p>\n
    [RequestSizeLimit(1048576)]\npublic class CreateModel : PageModel<\/code><\/pre>\n
    \u5982\u679c\u603b\u5927\u5c0f\u8d85\u8fc7\u8be5\u503c\uff0c\u6846\u67b6\u5c06\u8fd4\u56de 400 Bad Request \u72b6\u6001\u4ee3\u7801\u3002<\/p>\n
    \u5728\u672c\u7ae0\u7684\u6700\u540e\u4e00\u4e2a\u793a\u4f8b\u4e2d\uff0c\u60a8\u5c06\u4e0a\u4f20\u4e00\u4e2a\u6587\u4ef6\u5e76\u5c06\u5176\u4fdd\u5b58\u5230\u6587\u4ef6\u7cfb\u7edf\u4e2d\u3002\u60a8\u5c06\u4ecb\u7ecd\u4e00\u4e2a\u7528\u4e8e\u521b\u5efa\u57ce\u5e02\u7684\u9875\u9762\uff0c\u8be5\u8868\u5355\u5c06\u5305\u542b\u4e00\u4e2a\u6587\u4ef6\u4e0a\u4f20\u63a7\u4ef6\uff0c\u7528\u4e8e\u5b58\u50a8\u6bcf\u4e2a\u57ce\u5e02\u7684\u6807\u5fd7\u6027\u56fe\u50cf\u3002\u8fd9\u5c06\u4f7f\u60a8\u6709\u673a\u4f1a\u590d\u4e60\u8fd9\u4e24\u7ae0\u4e2d\u5173\u4e8e\u8868\u5355\u7684\u5176\u4ed6\u77e5\u8bc6\u3002\u60a8\u5c06\u5e94\u7528\u9a8c\u8bc1\u4ee5\u786e\u4fdd\u6bcf\u4e2a\u57ce\u5e02\u90fd\u6709\u4e00\u4e2a\u540d\u79f0\u548c\u4e00\u4e2a\u56fe\u50cf\uff0c\u5e76\u9a8c\u8bc1\u4e0a\u4f20\u6587\u4ef6\u6269\u5c55\u540d\u4ee5\u786e\u4fdd\u4ec5\u63a5\u53d7\u548c\u5904\u7406 JPG \u6587\u4ef6\u3002\u60a8\u5c06\u4e3a\u6b64\u76ee\u7684\u7f16\u5199\u81ea\u5b9a\u4e49\u9a8c\u8bc1\u5668\uff0c\u56e0\u4e3a\u60a8\u53ef\u80fd\u5e0c\u671b\u91cd\u7528\u9a8c\u8bc1\u903b\u8f91\u3002\u6709\u4e00\u4e2a\u53ef\u7528\u7684\u6269\u5c55\u9a8c\u8bc1\u5668\uff0c\u4f46\u5b83\u6839\u636e\u5b57\u7b26\u4e32\u800c\u4e0d\u662f\u6587\u4ef6\u4e0a\u4f20\u8fdb\u884c\u9a8c\u8bc1\u3002<\/p>\n
    \u4e0a\u4f20\u6587\u4ef6\u540e\uff0c\u60a8\u4f1a\u5c06\u5176\u91cd\u547d\u540d\u4e3a\u57ce\u5e02\u7684\u540d\u79f0\u3002\u8fd9\u6837\uff0c\u60a8\u53ef\u4ee5\u786e\u4fdd\u6bcf\u4e2a\u57ce\u5e02\u7684\u56fe\u50cf\u90fd\u662f\u552f\u4e00\u7684\u540d\u79f0\uff0c\u5e76\u4e14\u5728\u51fa\u73b0\u547d\u540d\u51b2\u7a81\u65f6\u4e0d\u4f1a\u610f\u5916\u8986\u76d6\u53e6\u4e00\u4e2a\u57ce\u5e02\u7684\u56fe\u50cf\u3002\u5982\u679c\u4e0a\u4f20\u7684\u6587\u4ef6\u5305\u542b\u6076\u610f\u6587\u4ef6\u540d\uff0c\u5b83\u8fd8\u53ef\u4ee5\u7f13\u89e3\u8986\u76d6\u670d\u52a1\u5668\u4e0a\u5173\u952e\u6587\u4ef6\u7684\u60c5\u51b5\u3002\u6210\u529f\u5904\u7406\u4e0a\u4f20\u540e\uff0c\u60a8\u5c06\u4f7f\u7528 PRG \uff08post-redirect-get\uff09 \u6a21\u5f0f\u91cd\u5b9a\u5411\u5230\u5c06\u663e\u793a\u56fe\u50cf\u7684\u53e6\u4e00\u4e2a\u9875\u9762\uff0c\u5e76\u4f7f\u7528 TempData \u5b58\u50a8\u57ce\u5e02\u540d\u79f0\u548c\u56fe\u50cf\u540d\u79f0\u3002<\/p>\n
    \u8ba9\u6211\u4eec\u4ece\u81ea\u5b9a\u4e49\u9a8c\u8bc1\u5668\u5f00\u59cb\u3002\u5c06 C# \u7c7b\u6587\u4ef6\u6dfb\u52a0\u5230\u73b0\u6709\u7684 ValidationAttributes \u6587\u4ef6\u5939\u4e2d\uff0c\u5e76\u5c06\u5176\u547d\u540d\u4e3a UploadFileExtensionsAttribute.cs\u3002\u4ee5\u4e0b\u662f\u9a8c\u8bc1\u5668\u7684\u5b8c\u6574\u4ee3\u7801\uff0c\u5305\u62ec using \u6307\u4ee4\u3002<\/p>\n
    \u6e05\u5355 6.24 UploadFileExtensions \u81ea\u5b9a\u4e49\u9a8c\u8bc1\u5668<\/p>\n
    using System.ComponentModel.DataAnnotations;\n\nnamespace CityBreaks.ValidationAttributes\n{\n    public class UploadFileExtensionsAttribute : ValidationAttribute\n    {\n        private IEnumerable<string> allowedExtensions;                 \u2776\n        public string Extensions { get; set;  }                        \u2777\n        protected override ValidationResult IsValid\n        \u27a5 (object value, ValidationContext validationContext)\n        {\n            allowedExtensions = Extensions?                            \u2778\n                .Split(new char[] { ',' },                             \u2778\n                        \u27a5 StringSplitOptions.RemoveEmptyEntries)      \u2778\n                .Select(x => x.ToLowerInvariant());                    \u2778\n            if (value is IFormFile file && \n                \u27a5 allowedExtensions.Any())                                 \n            {\n                var extension =                                        \u2779\n                \u27a5 Path.GetExtension(file.FileName.ToLowerInvariant());\u2779\n                if (!allowedExtensions.Contains(extension))            \u2779\u277a\n                {                                                      \u277a\n                    return new ValidationResult(ErrorMessage           \u2779\n                        ?? $"The file extension must be                \u2779\n                        \u27a5 {Extensions}");                             \u2779\n                }                                                      \u2779\n            }\n            return ValidationResult.Success;                             \u277a\n        }\n    }\n}<\/code><\/pre>\n
    \u2776 \u521b\u5efa\u4e00\u4e2a\u79c1\u6709\u5b57\u6bb5\u6765\u5bb9\u7eb3\u5141\u8bb8\u7684\u6269\u5c55\u3002
    \n\u2777 \u521b\u5efa\u4e00\u4e2a public property\uff0c\u4ee5\u4fbf\u8be5\u5c5e\u6027\u7684\u7528\u6237\u53ef\u4ee5\u8bbe\u7f6e\u5141\u8bb8\u7684\u6269\u5c55\u3002
    \n\u2778 \u5c06\u7528\u6237\u63d0\u4f9b\u7684\u6269\u5c55\u5206\u914d\u7ed9 private \u5b57\u6bb5\uff0c\u5c06\u5b83\u4eec\u4ece\u9017\u53f7\u5206\u9694\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u503c\u7684\u96c6\u5408\u3002
    \n\u2779 \u4f7f\u7528\u6a21\u5f0f\u5339\u914d\u6765\u786e\u4fdd\u6b64\u5c5e\u6027\u5df2\u5e94\u7528\u5230\u7684\u5c5e\u6027\u662f IFormFile\u3002\u5982\u679c\u662f\uff0c\u5e76\u4e14\u7528\u6237\u63d0\u4f9b\u4e86\u6269\u5c55\u540d\uff0c\u5219\u68c0\u67e5\u6587\u4ef6\u540d\u662f\u5426\u4e0e\u5176\u4e2d\u4efb\u4f55\u4e00\u4e2a\u5339\u914d\u3002\u5426\u5219\uff0c\u5c06\u8fd4\u56de\u4e00\u6761\u9519\u8bef\u6d88\u606f\u3002
    \n\u277a \u5728\u6240\u6709\u5176\u4ed6\u60c5\u51b5\u4e0b\uff0c\u9a8c\u8bc1\u6210\u529f\u3002<\/p>\n
    \u8fd9\u4e0d\u662f\u751f\u4ea7\u5c31\u7eea\u7684\u9a8c\u8bc1\u5668\u3002\u4f8b\u5982\uff0c\u5b83\u6ca1\u6709\u8003\u8651\u5230\u7528\u6237\u4e0d\u77e5\u9053\u662f\u5426\u5728\u5141\u8bb8\u7684\u6269\u5c55\u540d\u5217\u8868\u4e2d\u5305\u542b\u524d\u5bfc\u70b9\u3002\u4f46\u662f\uff0c\u5b83\u8db3\u4ee5\u8fdb\u884c\u6f14\u793a\u3002\u5b83\u4e0e\u524d\u9762\u7684\u9a8c\u8bc1\u5668\u975e\u5e38\u76f8\u4f3c\uff0c\u56e0\u4e3a\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a public \u5c5e\u6027\uff0c\u4f7f\u7528\u6237\u80fd\u591f\u4f20\u5165\u63a5\u53d7\u7684\u6587\u4ef6\u6269\u5c55\u540d\u5217\u8868\u3002\u5047\u8bbe\u7279\u6027\u5df2\u5e94\u7528\u5230\u7684\u5c5e\u6027\u662f IFormFile \u7c7b\u578b\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5c06\u6267\u884c\u9a8c\u8bc1\u903b\u8f91\uff0c\u5982\u679c\u672a\u63d0\u4f9b\u6587\u4ef6\u6269\u5c55\u540d\uff0c\u5219\u9a8c\u8bc1\u5c06\u5931\u8d25\u3002<\/p>\n
    \u73b0\u5728\u60a8\u9700\u8981\u6dfb\u52a0\u4e00\u4e2a\u7528\u4e8e\u521b\u5efa\u57ce\u5e02\u7684\u9875\u9762\u3002\u5c06\u65b0\u6587\u4ef6\u5939\u6dfb\u52a0\u5230\u540d\u4e3a CityManager \u7684 Pages \u6587\u4ef6\u5939\uff0c\u7136\u540e\u5728\u5176\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u540d\u4e3a Create \u7684\u65b0 Razor \u9875\u9762\u3002\u6253\u5f00 Create.cshtml.cs \u6587\u4ef6\uff0c\u5e76\u5c06 using \u6307\u4ee4\u66f4\u6539\u4e3a\u4ee5\u4e0b\u5185\u5bb9\u3002<\/p>\n
    \u793a\u4f8b 6.25 \u57ce\u5e02 CreateModel \u7c7b\u7684 Using \u6307\u4ee4<\/p>\n
    using CityBreaks.ValidationAttributes;\nusing Microsoft.AspNetCore.Mvc;\nusing Microsoft.AspNetCore.Mvc.RazorPages;\nusing System.ComponentModel.DataAnnotations;<\/code><\/pre>\n
    \u7136\u540e\u66f4\u6539 CreateModel \u7c7b\u672c\u8eab\u7684\u5185\u5bb9\u3002<\/p>\n
    Listing 6.26 City CreateModel \u7c7b<\/p>\n
    public class CreateModel : PageModel\n{\n    private readonly IWebHostEnvironment _environment;                  \u2776\n    public CreateModel(IWebHostEnvironment environment)                 \u2776\n    {                                                                   \u2776\n        _environment = environment;                                     \u2776\n    }                                                                   \u2776\n\n    [BindProperty]                                                      \u2777\n    [Required]                                                          \u2777\n    public string Name { get; set; }                                    \u2777\n    [BindProperty]                                                      \u2777\n    [Required]                                                          \u2777\n    [UploadFileExtensions(Extensions = ".jpg")]                         \u2777\n    public IFormFile Upload { get; set; }                               \u2777\n    [TempData]                                                          \u2778\n    public string Photo { get; set; }                                   \u2778\n\n    public async Task<IActionResult> OnPostAsync()\n    {\n        if (ModelState.IsValid)\n        {\n            TempData["Name"] = Name;                                    \u2779\n            Photo = $"{Name.ToLower().Replace(" ", "-")}                \u277a\n            \u27a5 {Path.GetExtension(Upload.FileName)}";                   \u277a\n            var filePath = Path.Combine(                                \u277a\n            \u27a5 _environment.WebRootPath, "images", "cities", Photo);    \u277a\n            using var stream = System.IO.File.                          \u277a\n            \u27a5 Create(filePath);                                        \u277a\n            await Upload.CopyToAsync(stream);                           \u277a\n            return RedirectToPage(                                      \u277b\n            \u27a5 "\/CityManager\/Index");                                   \u277b\n        }\n        return Page();\n    }\n}<\/code><\/pre>\n
    \u2776 \u5c06 IWebHostEnvironment \u670d\u52a1\u6ce8\u5165 CreateModel\uff0c\u4ee5\u4fbf\u60a8\u53ef\u4ee5\u4f7f\u7528\u5b83\u6765\u67e5\u627e wwwroot \u6587\u4ef6\u5939\u3002
    \n\u2777 \u4e3a\u57ce\u5e02\u540d\u79f0\u548c\u56fe\u7247\u4e0a\u4f20\u6dfb\u52a0\u7ed1\u5b9a\u76ee\u6807\u3002
    \n\u2778 \u6dfb\u52a0 TempData \u5c5e\u6027\u4ee5\u8868\u793a\u56fe\u50cf\u6587\u4ef6\u540d\u3002
    \n\u2779 \u5c06\u63d0\u4ea4\u7684\u57ce\u5e02\u540d\u79f0\u5206\u914d\u7ed9 TempData\u3002
    \n\u277a \u91cd\u547d\u540d\u4e0a\u4f20\u7684\u6587\u4ef6\uff0c\u5e76\u5c06\u5176\u4fdd\u5b58\u5230 image \u6587\u4ef6\u5939\u4e2d\u540d\u4e3a cities \u7684\u6587\u4ef6\u5939\u4e2d\u3002
    \n\u277b \u91cd\u5b9a\u5411\u7528\u6237\u3002<\/p>\n
    IWebHostEnvironment \u670d\u52a1\u63d0\u4f9b\u6709\u5173\u5e94\u7528\u7a0b\u5e8f\u6b63\u5728\u8fd0\u884c\u7684 Web \u6258\u7ba1\u73af\u5883\u7684\u4fe1\u606f\u3002\u5c06\u5176\u6ce8\u5165 CreateModel \u4ee5\u4f7f\u7528\u5176 WebRootPath \u5c5e\u6027\u67e5\u627e wwwroot \u6587\u4ef6\u5939\uff0c\u7136\u540e\u4e3a\u57ce\u5e02\u540d\u79f0\u548c\u6587\u4ef6\u4e0a\u4f20\u6dfb\u52a0\u7ed1\u5b9a\u76ee\u6807\u3002\u4e24\u8005\u90fd\u662f\u5fc5\u9700\u7684 \u2014 \u4f7f\u7528 Required \u5c5e\u6027\u8fdb\u884c\u4fee\u9970 \u2014 \u5e76\u4e14 Upload \u5c5e\u6027\u4e5f\u4f7f\u7528\u65b0\u7684 validation \u5c5e\u6027\u8fdb\u884c\u4fee\u9970\u3002\u60a8\u9009\u62e9\u53ea\u63a5\u53d7 JPG \u6587\u4ef6\u3002\u60a8\u8fd8\u6dfb\u52a0\u4e86\u53e6\u4e00\u4e2a\u4f7f\u7528 TempData \u5c5e\u6027\u4fee\u9970\u7684\u5c5e\u6027\u3002\u60a8\u5c06\u4f7f\u7528\u5b83\u6765\u5b58\u50a8\u4e0a\u4f20\u56fe\u50cf\u7684\u6587\u4ef6\u540d\uff0c\u4ee5\u4fbf\u5728\u91cd\u5b9a\u5411\u7528\u6237\u65f6\u53ef\u4ee5\u4f7f\u7528\u5b83\u3002<\/p>\n
    \u5982\u679c\u9a8c\u8bc1\u6210\u529f\uff0c\u60a8\u5c06\u83b7\u53d6\u63d0\u4ea4\u7684\u57ce\u5e02\u540d\u79f0\u5e76\u5c06\u5176\u6dfb\u52a0\u5230 TempData\uff1a<\/p>\n
    TempData["Name"] = Name;<\/code><\/pre>\n
    \u4f46\u662f\uff0c\u4e3a\u4ec0\u4e48\u4e0d\u76f4\u63a5\u5c06 TempData \u7279\u6027\u6dfb\u52a0\u5230\u73b0\u6709\u7684 Name \u5c5e\u6027\u4e2d\uff0c\u5c31\u50cf\u5bf9 Photo \u5c5e\u6027\u6240\u505a\u7684\u90a3\u6837\u5462\uff1f\u4f7f\u7528 TempData \u5c5e\u6027\uff0c\u60a8\u53ef\u4ee5\u8bbe\u7f6e TempData \u548c\u4ece TempData \u83b7\u53d6\u503c\u3002\u6a21\u578b\u7ed1\u5b9a\u548c TempData \u5f7c\u6b64\u51b2\u7a81\uff0c\u56e0\u4e3a\u5b83\u4eec\u90fd\u63d0\u4f9b\u4e86\u4e00\u79cd\u673a\u5236\uff0c\u7528\u4e8e\u4f7f\u7528 HTTP \u8bf7\u6c42\u4e2d\u7684\u503c\u586b\u5145\u9875\u9762\u5c5e\u6027\u3002\u4e00\u4e2a\u5fc5\u987b\u5728\u53e6\u4e00\u4e2a\u4e4b\u540e\u6267\u884c\uff0c\u9ed8\u8ba4\u884c\u4e3a\u662f TempData \u586b\u5145\u5728\u6a21\u578b\u7ed1\u5b9a\u4e4b\u540e\u8fdb\u884c\u3002\u56e0\u6b64\uff0c\u6a21\u578b\u7ed1\u5b9a\u5206\u914d\u7ed9\u5c5e\u6027\u7684\u4efb\u4f55\u503c\u90fd\u5c06\u88ab TempData \u4e2d\u7684\u4efb\u4f55\u5185\u5bb9\u8986\u76d6\uff0c\u8fd9\u901a\u5e38\u4e3a\u96f6\u3002\u56e0\u6b64\uff0c\u60a8\u5c06\u624b\u52a8\u8fdb\u884c\u5206\u914d\u3002<\/p>\n
    \u60a8\u76f8\u5f53\u7b80\u5355\u7684\u91cd\u547d\u540d\u903b\u8f91\u4f1a\u4ece\u57ce\u5e02\u540d\u79f0\u4e2d\u5220\u9664\u7a7a\u683c\u548c\u8fde\u5b57\u7b26\uff0c\u7136\u540e\u4f7f\u7528\u5c0f\u5199\u7248\u672c\u4f5c\u4e3a\u6587\u4ef6\u540d\u3002\u7136\u540e\uff0c\u6587\u4ef6\u5c06\u4fdd\u5b58\u5728 cities \u6587\u4ef6\u5939\u4e2d\uff0c\u8be5\u6587\u4ef6\u5939\u4f4d\u4e8e wwwroot\\images \u4e2d\uff0c\u4f4d\u4e8e\u60a8\u5728\u4e0a\u4e00\u7ae0\u4e2d\u521b\u5efa\u7684 Flags \u6587\u4ef6\u5939\u65c1\u8fb9\u3002\u5728\u5c06\u6587\u4ef6\u4fdd\u5b58\u5230\u8be5\u6587\u4ef6\u5939\u4e4b\u524d\uff0c\u60a8\u9700\u8981\u624b\u52a8\u521b\u5efa\u8be5\u6587\u4ef6\u5939\u3002\u4fdd\u5b58\u6587\u4ef6\u540e\uff0c\u5c06\u7528\u6237\u91cd\u5b9a\u5411\u5230\u5c1a\u4e0d\u5b58\u5728\u7684\u9875\u9762\u3002<\/p>\n
    \u5728\u521b\u5efa\u8be5\u9875\u9762\u4e4b\u524d\uff0c\u60a8\u9700\u8981\u5c06\u8868\u5355\u6dfb\u52a0\u5230 Create.cshtml \u6587\u4ef6\u3002\u6e05\u5355 6.27 \u663e\u793a\u4e86\u4e0a\u4f20\u8868\u5355\u7684\u4ee3\u7801\u3002\u60a8\u73b0\u5728\u5e94\u8be5\u5df2\u7ecf\u719f\u6089\u5176\u4e2d\u7684\u5927\u90e8\u5206\u5185\u5bb9\u3002\u552f\u4e00\u9700\u8981\u6ce8\u610f\u7684\u4e00\u70b9\u662f\u5728 form \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u4e0a\u6dfb\u52a0\u4e86 enctype \u5c5e\u6027\uff0c\u6307\u5b9a\u4e86\u8868\u5355\u6570\u636e\u5e94\u8be5\u5982\u4f55\u7f16\u7801\u3002\u8fd9\u88ab\u8bbe\u7f6e\u4e3a multipart\/ form-data\uff0c\u8fd9\u662f\u6210\u529f\u4e0a\u4f20\u8868\u5355\u7684\u4e09\u4e2a\u8981\u6c42\u4e4b\u4e00\u3002\u5982\u679c\u7701\u7565\u6b64\u9879\uff0c\u5219\u7f16\u7801\u5c06\u9ed8\u8ba4\u4e3a application\/x-www-form-urlencoded\uff0c\u4ece\u800c\u4ec5\u5c06\u6587\u4ef6\u540d\u53d1\u5e03\u5230\u670d\u52a1\u5668\u3002\u60a8\u5df2\u5c06 accept \u5c5e\u6027\u5e94\u7528\u4e8e\u6587\u4ef6\u8f93\u5165\u3002\u5176\u503c\u8bbe\u7f6e\u4e3a\u5e94\u9650\u5236\u4e0a\u4f20\u7684\u6587\u4ef6\u6269\u5c55\u540d\u3002\u652f\u6301\u6b64\u5c5e\u6027\u7684\u7528\u6237\u4ee3\u7406\u5c06\u5bf9\u7528\u6237\u53ef\u4ee5\u4ece\u4e2d\u9009\u62e9\u7684\u53ef\u7528\u6587\u4ef6\u5e94\u7528\u8fc7\u6ee4\u5668\uff0c\u4ee5\u9632\u6b62\u4e0a\u4f20\u9519\u8bef\u7684\u7c7b\u578b\u3002\u8fd9\u53ef\u4ee5\u88ab\u89c6\u4e3a\u5ba2\u6237\u7aef\u9a8c\u8bc1\u7684\u53e6\u4e00\u79cd\u65b9\u6cd5\uff0c\u4f46\u60a8\u4e0d\u5e94\u4f9d\u8d56\u5b83\u3002<\/p>\n
    \u5217\u8868 6.27 \u521b\u5efa\u57ce\u5e02\u8868\u5355<\/p>\n
    @page\n@model CityBreaks.Pages.CityManager.CreateModel\n@{\n}\n\n<h4>Create City<\/h4>\n\n<div class="row">\n    <div class="col-md-4">\n        <form method="post" enctype="multipart\/form-data">\n            <div class="form-group">\n                <label asp-for="Name" class="control-label"><\/label>\n                <input asp-for="Name" class="form-control" \/>\n                <span asp-validation-for="Name" class="text-danger"><\/span>\n            <\/div>\n            <div class="form-group">\n                <label asp-for="Upload" class="control-label"><\/label><br \/>\n                <input asp-for="Upload" accept=".jpg" \/>\n                <span asp-validation-for="Upload" class="text-danger"><\/span>\n            <\/div>\n            <div class="form-group">\n                <input type="submit" value="Create" class="btn btn-primary" \/>\n            <\/div>\n        <\/form>\n    <\/div>\n<\/div>\n@section scripts{\n    <partial name="_ValidationScriptsPartial"\/>\n}<\/code><\/pre>\n
    \u73b0\u5728\uff0c\u60a8\u5c06\u6dfb\u52a0\u6210\u529f\u63d0\u4ea4\u8868\u5355\u91cd\u5b9a\u5411\u5230\u7684\u9875\u9762\u3002\u5c06\u65b0\u7684 Razor \u9875\u9762\u6dfb\u52a0\u5230\u540d\u4e3a Index.cshtml \u7684 CityManager \u6587\u4ef6\u5939\uff0c\u5e76\u5c06\u9875\u9762\u5185\u5bb9\u66f4\u6539\u4e3a\u4ee5\u4e0b\u5185\u5bb9\u3002<\/p>\n
    Listing 6.28 \u786e\u8ba4\u56fe\u7247\u4e0a\u4f20<\/p>\n
    @page\n@model CityBreaks.Pages.CityManager.IndexModel\n@{\n}\n@if(TempData["Name"] != null){\n    <div class="col-6">\n        <h3>@TempData["Name"]<\/h3>\n        <img src="\/images\/cities\/@TempData["Photo"]" class="img-fluid" alt="@TempData["Name"]"\/>\n    <\/div>\n}<\/code><\/pre>\n
    \u540c\u6837\uff0c\u8fd9\u91cc\u6ca1\u6709\u4ec0\u4e48\u65b0\u4e1c\u897f\u3002\u68c0\u67e5 TempData \u662f\u5426\u5305\u542b\u67d0\u4e9b\u5185\u5bb9\uff0c\u7136\u540e\u5c06\u503c\u5448\u73b0\u7ed9\u6d4f\u89c8\u5668\u3002\u7136\u540e\uff0c\u5c06\u56fe\u50cf\u6587\u4ef6\u540d\u5206\u914d\u7ed9 img \u5143\u7d20\u7684 src \u7684\u4e00\u90e8\u5206\uff0c\u5e76\u4f7f\u7528 Bootstrap img-fluid CSS \u7c7b\u4f7f\u56fe\u50cf\u54cd\u5e94\u4ee5\u9002\u5e94\u5176\u5bb9\u5668\u3002<\/p>\n
    \u8fd0\u884c\u5e94\u7528\u7a0b\u5e8f\uff0c\u5bfc\u822a\u5230 \/city-manager\/create\uff0c\u7136\u540e\u8f93\u5165\u57ce\u5e02\u540d\u79f0\u3002\u627e\u5230\u8be5\u57ce\u5e02\u7684\u56fe\u7247\uff08\u6211\u4f7f\u7528\u4e86 Unsplash\u2014https:\/\/unsplash.com\/\u2014\u7528\u4e8e\u514d\u8d39\u7528\u4e8e\u5546\u4e1a\u548c\u975e\u5546\u4e1a\u7528\u9014\u7684\u56fe\u7247\uff09\uff0c\u5e76\u4e0a\u4f20\u5b83\u3002\u5982\u679c\u4e00\u5207\u6b63\u786e\uff0c\u60a8\u5e94\u8be5\u770b\u5230\u57ce\u5e02\u7684\u540d\u79f0\u548c\u56fe\u50cf\u5448\u73b0\u5230\u6d4f\u89c8\u5668\u4e2d\uff0c\u4ee5\u53ca\u4fdd\u5b58\u5230<\/a> Images\\cities \u6587\u4ef6\u5939\u4e2d\u7684\u56fe\u50cf\uff08\u56fe 6.16\uff09\u3002<\/p>\n
    <\/p>\n
    \u56fe 6.16 \u4e0a\u4f20\u5230\u6d4f\u89c8\u5668\u7684\u56fe\u7247\u6587\u4ef6<\/p>\n
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    \u603b\u7ed3<\/h2>\n
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    \n\u8868\u5355\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u4f1a\u751f\u6210\u4e00\u4e2a\u5305\u542b\u8bf7\u6c42\u9a8c\u8bc1\u4ee4\u724c\u7684\u9690\u85cf\u8f93\u5165\u3002
    \n\u8f93\u5165\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u4f1a\u6839\u636e\u7ed1\u5b9a\u5230\u5b83\u4eec\u7684\u6a21\u578b\u5c5e\u6027\u7684\u6570\u636e\u7c7b\u578b\u751f\u6210\u4e0d\u540c\u7684\u7c7b\u578b\u5c5e\u6027\u3002\u5b83\u4eec\u8fd8\u4f1a\u751f\u6210\u7528\u4e8e\u5ba2\u6237\u7aef\u9a8c\u8bc1\u7684 data-val \u5c5e\u6027\u3002
    \n\u60a8\u53ef\u4ee5\u5728\u6a21\u578b\u5c5e\u6027\u4e0a\u4f7f\u7528 DataType \u5c5e\u6027\u6765\u751f\u6210\u66f4\u5177\u4f53\u7684\u7c7b\u578b\u5c5e\u6027\u3002
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    \n\u60a8\u53ef\u4ee5\u901a\u8fc7\u4e3a select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u4e0a\u7ed1\u5b9a\u5230 for \u5c5e\u6027\u7684\u5c5e\u6027\u5206\u914d\u503c\u6765\u8bbe\u7f6e\u6240\u9009\u9879\u3002
    \n\u60a8\u53ef\u4ee5\u901a\u8fc7\u5c06 select \u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u7ed1\u5b9a\u5230\u96c6\u5408\u5c5e\u6027\u6765\u542f\u7528\u591a\u4e2a\u9009\u62e9\u3002
    \nSelectList \u652f\u6301\u4f7f\u7528\u9009\u9879\u7ec4\u3002
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    \n\u5f53\u60a8\u4f7f\u7528\u8f93\u5165\u6807\u8bb0\u5e2e\u52a9\u7a0b\u5e8f\u751f\u6210\u590d\u9009\u6846\u65f6\uff0c\u5c06 Boolean \u5c5e\u6027\u7ed1\u5b9a\u5230\u8be5\u590d\u9009\u6846\u4f1a\u751f\u6210\u4e00\u4e2a\u9690\u85cf\u5b57\u6bb5\uff0c\u5176\u503c\u8bbe\u7f6e\u4e3a false\u3002
    \n\u65e0\u7ebf\u7535\u63a7\u4ef6\u5fc5\u987b\u663e\u5f0f\u6307\u5b9a\u5176\u7c7b\u578b\u3002
    \n\u6587\u4ef6\u4e0a\u4f20\u9700\u8981 multipart\/form-data \u7f16\u7801\u624d\u80fd\u6b63\u5e38\u5de5\u4f5c\u3002
    \n\u5fc5\u987b\u53d1\u5e03\u4e0a\u4f20\u7684\u6587\u4ef6\uff0c\u5e76\u4e14\u5fc5\u987b\u5c06\u5176\u7ed1\u5b9a\u5230 IFormFile \u7c7b\u578b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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