{"id":3486,"date":"2025-04-13T12:53:08","date_gmt":"2025-04-13T04:53:08","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3486"},"modified":"2025-04-13T12:53:08","modified_gmt":"2025-04-13T04:53:08","slug":"c-%e5%b8%b8%e9%87%8f%ef%bc%88const%ef%bc%89%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/04\/13\/c-%e5%b8%b8%e9%87%8f%ef%bc%88const%ef%bc%89%e8%af%a6%e8%a7%a3\/","title":{"rendered":"C# \u5e38\u91cf\uff08const\uff09\u8be6\u89e3"},"content":{"rendered":"\n<p>\u672c\u6587\u7ae0\u4f1a\u7ad9\u5728\u4e13\u4e1a\u5f00\u53d1\u5de5\u7a0b\u5e08\u7684\u89d2\u5ea6\uff0c\u5bf9 <strong>C# \u4e2d\u7684\u5e38\u91cf\uff08Constants\uff09<\/strong> \u8fdb\u884c<strong>\u5168\u9762\u3001\u8be6\u7ec6\u3001\u6743\u5a01\u53ef\u9760<\/strong>\u7684\u9610\u8ff0\uff0c\u6db5\u76d6\uff1a\u57fa\u672c\u8bed\u6cd5\u3001\u4f7f\u7528\u573a\u666f\u3001\u9650\u5236\u3001\u4e0e <code>readonly<\/code> \u7684\u533a\u522b\u3001\u6700\u4f73\u5b9e\u8df5\u7b49\u5185\u5bb9\uff0c\u5e76\u63d0\u4f9b\u6743\u5a01\u94fe\u63a5\uff08\u5982\u5fae\u8f6f\u5b98\u65b9\u6587\u6863\uff09\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u4ec0\u4e48\u662f\u5e38\u91cf\uff1f<\/h2>\n\n\n\n<p>\u5728 C# \u4e2d\uff0c\u5e38\u91cf\u662f<strong>\u5728\u7f16\u8bd1\u65f6\u5176\u503c\u5c31\u5df2\u7ecf\u786e\u5b9a\u3001\u5e76\u4e14\u65e0\u6cd5\u88ab\u4fee\u6539\u7684\u53d8\u91cf<\/strong>\u3002\u4e00\u65e6\u5b9a\u4e49\uff0c\u5c31\u4e0d\u80fd\u66f4\u6539\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528\u5173\u952e\u5b57\uff1a<code>const<\/code><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u57fa\u672c\u8bed\u6cd5<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>const \u6570\u636e\u7c7b\u578b \u5e38\u91cf\u540d = \u503c;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u793a\u4f8b\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>const int DaysInWeek = 7;\nconst string CompanyName = \"OpenAI\";\nconst double Pi = 3.14159;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u5e38\u91cf\u7684\u7279\u6027<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u6027<\/th><th>\u8bf4\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u7f16\u8bd1\u65f6\u786e\u5b9a<\/td><td>\u5e38\u91cf\u7684\u503c\u5fc5\u987b\u5728<strong>\u7f16\u8bd1\u671f\u95f4<\/strong>\u5df2\u77e5\uff0c\u4e0d\u80fd\u8fd0\u884c\u65f6\u52a8\u6001\u8d4b\u503c<\/td><\/tr><tr><td>\u53ea\u80fd\u662f\u57fa\u672c\u7c7b\u578b<\/td><td><code>const<\/code> \u53ea\u80fd\u7528\u4e8e C# \u7684<strong>\u5185\u7f6e\u6570\u636e\u7c7b\u578b<\/strong>\uff08int\u3001double\u3001string\u3001char\u3001bool \u7b49\uff09<\/td><\/tr><tr><td>\u9690\u5f0f\u4e3a <code>static<\/code><\/td><td>\u5e38\u91cf\u662f\u7c7b\u7ea7\u522b\u7684\u6210\u5458\uff0c\u4e0d\u9700\u8981\u5b9e\u4f8b\u5316\u7c7b\u5c31\u53ef\u4ee5\u8bbf\u95ee<\/td><\/tr><tr><td>\u4e0d\u53ef\u66f4\u6539<\/td><td>\u5b9a\u4e49\u540e\u65e0\u6cd5\u8d4b\u65b0\u503c<\/td><\/tr><tr><td>\u53ef\u7528\u4e8e <code>switch case<\/code>\u3001\u6570\u7ec4\u5927\u5c0f\u7b49\u7f16\u8bd1\u65f6\u5e38\u91cf\u9700\u6c42\u5904<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u9002\u5408\u7528\u5e38\u91cf\u7684\u573a\u666f<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5168\u5c40\u4e0d\u53d8\u7684\u503c\uff0c\u5982\uff1a<\/li>\n\n\n\n<li>\u4e00\u5e74\u4e2d\u7684\u6708\u4efd\u6570<\/li>\n\n\n\n<li>\u56fa\u5b9a\u7684\u6570\u636e\u5e93\u8fde\u63a5\u5b57\u7b26\u4e32\u524d\u7f00<\/li>\n\n\n\n<li>\u7248\u672c\u53f7\u4fe1\u606f<\/li>\n\n\n\n<li>\u72b6\u6001\u7801\u3001\u6743\u9650\u7801<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u4e0e <code>readonly<\/code> \u7684\u533a\u522b\uff08\u9762\u8bd5\u5e38\u8003\uff09<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5bf9\u6bd4\u9879<\/th><th><code>const<\/code><\/th><th><code>readonly<\/code><\/th><\/tr><\/thead><tbody><tr><td>\u503c\u8bbe\u5b9a\u65f6\u673a<\/td><td>\u7f16\u8bd1\u65f6<\/td><td>\u8fd0\u884c\u65f6\uff08\u6784\u9020\u51fd\u6570\u4e2d\uff09<\/td><\/tr><tr><td>\u53ef\u652f\u6301\u7c7b\u578b<\/td><td>\u4ec5\u7f16\u8bd1\u671f\u5e38\u91cf\u7c7b\u578b<\/td><td>\u4efb\u610f\u7c7b\u578b\uff08\u5305\u62ec\u7c7b\u3001\u7ed3\u6784\u4f53\u3001\u5bf9\u8c61\uff09<\/td><\/tr><tr><td>\u662f\u5426\u9690\u5f0f static<\/td><td>\u662f<\/td><td>\u5426\uff08\u53ef\u9009\u62e9\uff09<\/td><\/tr><tr><td>\u53ef\u5426\u5728\u6784\u9020\u51fd\u6570\u8d4b\u503c<\/td><td>\u5426<\/td><td>\u53ef\u4ee5<\/td><\/tr><tr><td>\u4f7f\u7528\u573a\u666f<\/td><td>\u56fa\u5b9a\u4e0d\u53d8\uff0c\u5982\u03c0<\/td><td>\u521d\u59cb\u5316\u540e\u4e0d\u53d8\uff0c\u5982\u542f\u52a8\u65f6\u95f4\u6233<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u793a\u4f8b\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Example {\n    public const double Pi = 3.14159; \/\/ \u7f16\u8bd1\u65f6\u5e38\u91cf\n\n    public readonly DateTime StartTime;\n\n    public Example() {\n        StartTime = DateTime.Now; \/\/ \u8fd0\u884c\u65f6\u5e38\u91cf\uff0c\u53ea\u80fd\u8d4b\u503c\u4e00\u6b21\n    }\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u6ce8\u610f\u4e8b\u9879<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e0d\u80fd\u7528\u4e8e\u590d\u6742\u5bf9\u8c61\uff1a<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>   \/\/ \u9519\u8bef\n   const DateTime myTime = DateTime.Now;<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528 <code>readonly<\/code> \u66ff\u4ee3\u3002<\/p>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u7c7b\u7ea7\u522b\u8bbf\u95ee\uff1a<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>   public class MyClass {\n       public const string AppName = \"MyApp\";\n   }\n\n   Console.WriteLine(MyClass.AppName); \/\/ OK<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u7ed3\u5408\u679a\u4e3e\u4f7f\u7528\u5e38\u91cf\uff08\u9ad8\u7ea7\u573a\u666f\uff09<\/h2>\n\n\n\n<p>\u867d\u7136\u53ef\u4ee5\u7528 <code>const<\/code> \u5b9a\u4e49\u72b6\u6001\u7801\uff0c\u4f46\u4f7f\u7528 <code>enum<\/code> \u66f4\u5177\u53ef\u8bfb\u6027\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum StatusCode {\n    Success = 200,\n    NotFound = 404,\n    ServerError = 500\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001C# \u5e38\u91cf\u76f8\u5173\u7684\u5b98\u65b9\u6587\u6863\u94fe\u63a5<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd17 <a href=\"https:\/\/learn.microsoft.com\/en-us\/dotnet\/csharp\/language-reference\/keywords\/const\">Microsoft Docs &#8211; const keyword (C# Reference)<\/a><\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/learn.microsoft.com\/en-us\/dotnet\/csharp\/language-reference\/keywords\/readonly\">Microsoft Docs &#8211; readonly (C# Reference)<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e5d\u3001\u63a8\u8350\u5b9e\u8df5<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5bf9\u4e8e\u7f16\u8bd1\u65f6\u56fa\u5b9a\u503c\uff0c<strong>\u59cb\u7ec8\u4f18\u5148\u4f7f\u7528 <code>const<\/code><\/strong><\/li>\n\n\n\n<li>\u82e5\u9700\u521d\u59cb\u5316\u590d\u6742\u6570\u636e\u6216\u4f9d\u8d56\u8fd0\u884c\u65f6\u8ba1\u7b97\uff0c\u4f7f\u7528 <code>readonly<\/code><\/li>\n\n\n\n<li><strong>\u4e0d\u8981\u5728 API \u6216\u516c\u5171\u63a5\u53e3\u4e2d\u66b4\u9732 <code>const<\/code>\uff0c\u4ee5\u9632\u4e8c\u8fdb\u5236\u517c\u5bb9\u6027\u95ee\u9898<\/strong>\uff08\u503c\u4f1a\u88ab\u5185\u8054\uff09<\/li>\n\n\n\n<li>\u5e38\u91cf\u540d\u5efa\u8bae\u4f7f\u7528 <strong>PascalCase<\/strong>\uff08\u5982 <code>MaxValue<\/code>\uff09\uff0c\u9075\u5faa C# \u547d\u540d\u89c4\u8303<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5341\u3001\u9644\u52a0\u6280\u5de7\uff1a\u5e38\u91cf\u6570\u7ec4\u7684\u66ff\u4ee3\u65b9\u6cd5<\/h2>\n\n\n\n<p>C# \u4e0d\u652f\u6301 <code>const string[]<\/code>\uff0c\u53ef\u7528 <code>readonly<\/code> \u914d\u5408 <code>static<\/code> \u66ff\u4ee3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static class Constants {\n    public static readonly string&#91;] AllowedExtensions = new&#91;] { \".jpg\", \".png\", \".gif\" };\n}\n\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\uff0c\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u7ae0\u4f1a\u7ad9\u5728\u4e13\u4e1a\u5f00\u53d1\u5de5\u7a0b\u5e08\u7684\u89d2\u5ea6\uff0c\u5bf9 C# \u4e2d\u7684\u5e38\u91cf\uff08Constants\uff09 \u8fdb\u884c\u5168\u9762\u3001\u8be6\u7ec6\u3001\u6743\u5a01\u53ef\u9760\u7684\u9610\u8ff0\uff0c\u6db5 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3487,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83],"tags":[],"class_list":["post-3486","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3486","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3486"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3486\/revisions"}],"predecessor-version":[{"id":3488,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3486\/revisions\/3488"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3487"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3486"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3486"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3486"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}