{"id":3599,"date":"2025-04-20T19:14:54","date_gmt":"2025-04-20T11:14:54","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3599"},"modified":"2025-04-20T19:14:54","modified_gmt":"2025-04-20T11:14:54","slug":"c-%e5%8c%bf%e5%90%8d%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/04\/20\/c-%e5%8c%bf%e5%90%8d%e6%96%b9%e6%b3%95\/","title":{"rendered":"C# \u533f\u540d\u65b9\u6cd5"},"content":{"rendered":"\n

\u672c\u7ae0\u8282\u5168\u9762\u7cfb\u7edf\u5730\u8bb2\u89e3 C# \u533f\u540d\u65b9\u6cd5\uff08Anonymous Methods\uff09<\/strong>\uff0c\u5e76\u642d\u914d\u5b9e\u4f8b\u548c\u9ad8\u7ea7\u7528\u6cd5\u5e2e\u52a9\u4f60\u7406\u89e3\u548c\u638c\u63e1\uff0c\u542b\u8bed\u6cd5\u3001\u5b9e\u4f8b\u3001\u59d4\u6258\u3001\u95ed\u5305\u3001\u5bf9\u6bd4 Lambda\u3002<\/p>\n\n\n\n

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1. \u4ec0\u4e48\u662f\u533f\u540d\u65b9\u6cd5\uff1f<\/h2>\n\n\n\n

\u533f\u540d\u65b9\u6cd5\u662f\u5728\u4e0d\u663e\u5f0f\u58f0\u660e\u65b9\u6cd5\u540d\u79f0\u7684\u60c5\u51b5\u4e0b\uff0c\u76f4\u63a5\u5b9a\u4e49\u65b9\u6cd5\u4f53<\/strong>\u5e76\u5c06\u5176\u8d4b\u7ed9\u4e00\u4e2a\u59d4\u6258<\/strong>\u7684\u65b9\u5f0f\u3002<\/p>\n\n\n\n

\ud83d\udd39 \u8bed\u6cd5\u5f62\u5f0f\uff1a<\/h3>\n\n\n\n
delegate(int x, int y)\n{\n    return x + y;\n};<\/code><\/pre>\n\n\n\n
\u5b83\u5b9e\u9645\u4e0a\u662f C# 2.0 \u5f15\u5165\u7684\uff0c\u7528\u4e8e\u589e\u5f3a\u5bf9\u59d4\u6258\u7684\u652f\u6301<\/strong>\uff0c\u540e\u6765\u88ab lambda<\/code> \u8868\u8fbe\u5f0f\u8fdb\u4e00\u6b65\u7b80\u5316\u548c\u53d6\u4ee3\u3002<\/p>\n\n\n\n
\n\n\n\n
2. \u57fa\u7840\u793a\u4f8b\uff1a\u533f\u540d\u65b9\u6cd5\u8d4b\u503c\u7ed9\u59d4\u6258<\/h2>\n\n\n\n
using System;\n\npublic delegate void PrintDelegate(string message);\n\nclass Program\n{\n    static void Main()\n    {\n        PrintDelegate printer = delegate (string msg)\n        {\n            Console.WriteLine(\"\u6253\u5370\u5185\u5bb9\uff1a\" + msg);\n        };\n\n        printer(\"Hello, \u533f\u540d\u65b9\u6cd5\");\n    }\n}<\/code><\/pre>\n\n\n\n
\n\n\n\n
3. \u533f\u540d\u65b9\u6cd5 vs Lambda \u8868\u8fbe\u5f0f<\/h2>\n\n\n\n
\u7279\u6027<\/th>\u533f\u540d\u65b9\u6cd5<\/th>Lambda \u8868\u8fbe\u5f0f<\/th><\/tr><\/thead>
\u5f15\u5165\u7248\u672c<\/td>C# 2.0<\/td>C# 3.0<\/td><\/tr>
\u662f\u5426\u6709 delegate<\/code> \u5173\u952e\u8bcd<\/td>\u662f<\/td>\u5426<\/td><\/tr>
\u662f\u5426\u5fc5\u987b\u6307\u5b9a\u53c2\u6570\u7c7b\u578b<\/td>\u5426\uff08\u53ef\u9009\uff09<\/td>\u5426\uff08\u53ef\u9009\uff09<\/td><\/tr>
\u662f\u5426\u7b80\u6d01<\/td>\u7565\u5197\u957f<\/td>\u66f4\u7b80\u6d01\u4f18\u96c5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\ud83d\udd39 Lambda \u66ff\u4ee3\u5199\u6cd5\uff1a<\/p>\n\n\n\n
PrintDelegate printer = msg => Console.WriteLine(\"\u6253\u5370\u5185\u5bb9\uff1a\" + msg);<\/code><\/pre>\n\n\n\n
\n\n\n\n
4. \u4f7f\u7528\u533f\u540d\u65b9\u6cd5\u505a\u4e8b\u4ef6\u5904\u7406\u5668<\/h2>\n\n\n\n
button.Click += delegate (object sender, EventArgs e)\n{\n    Console.WriteLine(\"\u6309\u94ae\u88ab\u70b9\u51fb\");\n};<\/code><\/pre>\n\n\n\n
\n\n\n\n
5. \u533f\u540d\u65b9\u6cd5\u4e2d\u7684\u95ed\u5305\u652f\u6301<\/h2>\n\n\n\n
\u533f\u540d\u65b9\u6cd5\u53ef\u6355\u83b7\u5e76\u8bbf\u95ee\u5916\u90e8\u53d8\u91cf\uff08\u5373\u95ed\u5305\uff09\uff1a<\/p>\n\n\n\n
int count = 0;\nAction increment = delegate\n{\n    count++;\n    Console.WriteLine(\"Count = \" + count);\n};\n\nincrement(); \/\/ Count = 1\nincrement(); \/\/ Count = 2<\/code><\/pre>\n\n\n\n
\u2705 \u95ed\u5305\u4e2d\u53d8\u91cf\u4f1a\u88ab\u201c\u6355\u83b7\u201d\u4e3a\u5f15\u7528\uff0c\u800c\u4e0d\u662f\u503c\u7684\u526f\u672c\u3002<\/p>\n\n\n\n
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6. \u5e26\u8fd4\u56de\u503c\u7684\u533f\u540d\u65b9\u6cd5<\/h2>\n\n\n\n
Func<int, int, int> sum = delegate (int a, int b)\n{\n    return a + b;\n};\n\nConsole.WriteLine(sum(3, 5)); \/\/ \u8f93\u51fa 8<\/code><\/pre>\n\n\n\n
\n\n\n\n
7. \u591a\u53c2\u6570\u533f\u540d\u65b9\u6cd5\uff08\u7528\u4e8e LINQ\uff09<\/h2>\n\n\n\n
var nums = new[] { 1, 2, 3, 4 };\n\nvar evens = Array.FindAll(nums, delegate (int x)\n{\n    return x % 2 == 0;\n});\n\nforeach (var n in evens) Console.WriteLine(n); \/\/ 2, 4<\/code><\/pre>\n\n\n\n
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8. \u9ad8\u7ea7\uff1a\u6cdb\u578b\u59d4\u6258 + \u533f\u540d\u65b9\u6cd5<\/h2>\n\n\n\n
Func<string, string> formatter = delegate (string name)\n{\n    return $\"\u4f60\u597d\uff0c{name}\uff01\";\n};\n\nConsole.WriteLine(formatter(\"\u5f20\u4e09\")); \/\/ \u4f60\u597d\uff0c\u5f20\u4e09\uff01<\/code><\/pre>\n\n\n\n
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9. \u533f\u540d\u65b9\u6cd5\u4e0d\u80fd\u505a\u4ec0\u4e48\uff1f<\/h2>\n\n\n\n
    \n
  • \u274c \u65e0\u6cd5\u8bbf\u95ee ref<\/code> \u548c out<\/code> \u53c2\u6570<\/li>\n\n\n\n
  • \u274c \u4e0d\u80fd\u7528\u4e8e\u5f02\u6b65 async<\/code>\/await<\/code>\uff08\u5efa\u8bae\u7528 lambda\uff09<\/li>\n\n\n\n
  • \u274c \u4e0d\u9002\u7528\u4e8e\u7ed3\u6784\u4f53\u4e2d\u7684\u59d4\u6258\u6355\u83b7\u503c\u7c7b\u578b\u53d8\u91cf\uff08\u907f\u514d\u88c5\u7bb1\uff09<\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n
    10. \u63a8\u8350\u573a\u666f\u603b\u7ed3<\/h2>\n\n\n\n
    \u573a\u666f<\/th>\u63a8\u8350\u7528\u6cd5<\/th><\/tr><\/thead>
    \u7b80\u5355\u4e8b\u4ef6\u7ed1\u5b9a<\/td>\u533f\u540d\u65b9\u6cd5 \u2705<\/td><\/tr>
    \u591a\u6b65\u903b\u8f91 + \u6e05\u6670\u547d\u540d<\/td>\u663e\u5f0f\u65b9\u6cd5 \u2705<\/td><\/tr>
    \u4e00\u884c\u5904\u7406\u903b\u8f91<\/td>Lambda \u2705<\/td><\/tr>
    \u9700\u8981\u6355\u83b7\u5916\u90e8\u53d8\u91cf<\/td>\u533f\u540d\u6216 lambda \u2705<\/td><\/tr>
    \u4f5c\u4e3a\u4e34\u65f6\u56de\u8c03\u4f20\u9012<\/td>Lambda \u2705<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n
    \ud83d\udd17 \u5ef6\u4f38\u9605\u8bfb<\/h2>\n\n\n\n
      \n
    • \ud83d\udcd8 Microsoft \u5b98\u65b9\u6587\u6863 \u2013 \u533f\u540d\u65b9\u6cd5
      https:\/\/learn.microsoft.com\/en-us\/dotnet\/csharp\/programming-guide\/statements-expressions-operators\/anonymous-methods<\/li>\n\n\n\n
    • \ud83d\udcd8 Lambda \u4e0e\u533f\u540d\u65b9\u6cd5\u5173\u7cfb\uff08StackOverflow\uff09
      https:\/\/stackoverflow.com\/questions\/317770\/anonymous-method-vs-lambda-expression<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n
      \u4e0b\u7bc7\u6587\u7ae0\u7ee7\u7eed\u62d3\u5c55\u5982\u4e0b\u5185\u5bb9\uff1a<\/p>\n\n\n\n
        \n
      • \u2705 \u533f\u540d\u65b9\u6cd5 + \u59d4\u6258\u94fe\u7ec4\u5408<\/li>\n\n\n\n
      • \u2705 \u533f\u540d\u65b9\u6cd5\u5b9e\u73b0\u7b56\u7565\u6a21\u5f0f\u3001\u72b6\u6001\u6a21\u5f0f<\/li>\n\n\n\n
      • \u2705 \u533f\u540d\u65b9\u6cd5\u5728\u591a\u7ebf\u7a0b\/\u5e76\u53d1\u573a\u666f\u4e0b\u7684\u5b89\u5168\u6027\u5206\u6790<\/li>\n\n\n\n
      • \u2705 \u7f16\u8bd1\u5668\u5982\u4f55\u751f\u6210\u533f\u540d\u65b9\u6cd5\u7c7b\uff08IL \u5206\u6790\uff09<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
        \u672c\u7ae0\u8282\u5168\u9762\u7cfb\u7edf\u5730\u8bb2\u89e3 C# \u533f\u540d\u65b9\u6cd5\uff08Anonymous Methods\uff09\uff0c\u5e76\u642d\u914d\u5b9e\u4f8b\u548c\u9ad8\u7ea7\u7528\u6cd5\u5e2e\u52a9\u4f60\u7406\u89e3\u548c\u638c […]<\/p>\n","protected":false},"author":1,"featured_media":3600,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83],"tags":[],"class_list":["post-3599","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\/3599","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=3599"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3599\/revisions"}],"predecessor-version":[{"id":3601,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3599\/revisions\/3601"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3600"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3599"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3599"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3599"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}