{"id":3582,"date":"2025-04-19T10:35:44","date_gmt":"2025-04-19T02:35:44","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3582"},"modified":"2025-04-19T10:35:44","modified_gmt":"2025-04-19T02:35:44","slug":"c-%e5%a7%94%e6%89%98%ef%bc%88delegate%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/04\/19\/c-%e5%a7%94%e6%89%98%ef%bc%88delegate%ef%bc%89\/","title":{"rendered":"C# \u59d4\u6258\uff08Delegate\uff09"},"content":{"rendered":"\n

\u5728 C# \u4e2d\uff0c\u59d4\u6258<\/strong>\u662f\u4e00\u79cd\u7c7b\u578b\u5b89\u5168\u7684\u51fd\u6570\u6307\u9488\u3002\u59d4\u6258\u53ef\u4ee5\u7528\u6765\u5c06\u65b9\u6cd5\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u5176\u4ed6\u65b9\u6cd5\uff0c\u6216\u8005\u7528\u4e8e\u4e8b\u4ef6\u548c\u56de\u8c03\u673a\u5236\u3002\u5b83\u5141\u8bb8\u4f60\u5c01\u88c5\u65b9\u6cd5\u7684\u8c03\u7528\uff0c\u5e76\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u5730\u8c03\u7528\u5b83\u3002<\/p>\n\n\n\n

1. \u59d4\u6258\u7684\u57fa\u672c\u5b9a\u4e49<\/strong><\/h2>\n\n\n\n

\u59d4\u6258\u662f\u4e00\u4e2a\u7c7b\u578b\uff0c\u5b83\u5b9a\u4e49\u4e86\u53ef\u4ee5\u5f15\u7528\u7684\u65b9\u6cd5\u7684\u7b7e\u540d\u3002\u59d4\u6258\u7c7b\u578b\u7684\u5b9e\u4f8b\u53ef\u4ee5\u5b58\u50a8\u5bf9\u7279\u5b9a\u65b9\u6cd5\u7684\u5f15\u7528\uff0c\u7c7b\u4f3c\u4e8e\u51fd\u6570\u6307\u9488\u3002<\/p>\n\n\n\n

\/\/ \u5b9a\u4e49\u4e00\u4e2a\u59d4\u6258\u7c7b\u578b\npublic delegate void MyDelegate(string message);\n\n\/\/ \u4f7f\u7528\u59d4\u6258\npublic class DelegateExample\n{\n    public static void Main()\n    {\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u59d4\u6258\u5b9e\u4f8b\uff0c\u6307\u5411\u4e00\u4e2a\u65b9\u6cd5\n        MyDelegate del = new MyDelegate(PrintMessage);\n\n        \/\/ \u8c03\u7528\u59d4\u6258\n        del(\"Hello, world!\");\n    }\n\n    \/\/ \u5b9a\u4e49\u4e00\u4e2a\u4e0e\u59d4\u6258\u7b7e\u540d\u5339\u914d\u7684\u65b9\u6cd5\n    public static void PrintMessage(string message)\n    {\n        Console.WriteLine(message);\n    }\n}<\/code><\/pre>\n\n\n\n
\u8f93\u51fa\uff1a<\/p>\n\n\n\n
Hello, world!<\/code><\/pre>\n\n\n\n
2. \u59d4\u6258\u7684\u6784\u6210<\/strong><\/h2>\n\n\n\n
\u59d4\u6258\u7531\u4ee5\u4e0b\u51e0\u4e2a\u90e8\u5206\u6784\u6210\uff1a<\/p>\n\n\n\n
    \n
  • \u65b9\u6cd5\u7b7e\u540d<\/strong>\uff1a\u5b9a\u4e49\u4e86\u59d4\u6258\u53ef\u4ee5\u8c03\u7528\u7684\u65b9\u6cd5\u7c7b\u578b\uff08\u8fd4\u56de\u7c7b\u578b\u3001\u53c2\u6570\u7c7b\u578b\uff09\u3002<\/li>\n\n\n\n
  • \u59d4\u6258\u7c7b\u578b<\/strong>\uff1a\u5b9a\u4e49\u4e86\u59d4\u6258\u7684\u7c7b\u578b\uff0c\u7528\u4e8e\u5c01\u88c5\u7279\u5b9a\u65b9\u6cd5\u7684\u8c03\u7528\u3002<\/li>\n\n\n\n
  • \u59d4\u6258\u5b9e\u4f8b<\/strong>\uff1a\u6307\u5411\u5177\u4f53\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728\u8fd0\u884c\u65f6\u7ed1\u5b9a\u4e0d\u540c\u7684\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n
    3. \u59d4\u6258\u7684\u591a\u64ad\uff08Multicast Delegates\uff09<\/strong><\/h2>\n\n\n\n
    \u59d4\u6258\u4e0d\u4ec5\u53ef\u4ee5\u6307\u5411\u4e00\u4e2a\u65b9\u6cd5\uff0c\u8fd8\u53ef\u4ee5\u6307\u5411\u591a\u4e2a\u65b9\u6cd5\u3002\u8fd9\u88ab\u79f0\u4e3a\u591a\u64ad\u59d4\u6258<\/strong>\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 +<\/code> \u8fd0\u7b97\u7b26\u5c06\u591a\u4e2a\u65b9\u6cd5\u6dfb\u52a0\u5230\u4e00\u4e2a\u59d4\u6258\u5b9e\u4f8b\u4e2d\u3002<\/p>\n\n\n\n
    using System;\n\npublic delegate void MyDelegate(string message);\n\npublic class MulticastDelegateExample\n{\n    public static void Main()\n    {\n        MyDelegate del1 = new MyDelegate(Method1);\n        MyDelegate del2 = new MyDelegate(Method2);\n\n        \/\/ \u591a\u64ad\u59d4\u6258\n        MyDelegate multiDel = del1 + del2;\n\n        \/\/ \u8c03\u7528\u591a\u64ad\u59d4\u6258\uff0c\u4f9d\u6b21\u8c03\u7528\u59d4\u6258\u94fe\u4e2d\u7684\u65b9\u6cd5\n        multiDel(\"Hello, world!\");\n    }\n\n    public static void Method1(string message)\n    {\n        Console.WriteLine(\"Method1: \" + message);\n    }\n\n    public static void Method2(string message)\n    {\n        Console.WriteLine(\"Method2: \" + message);\n    }\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/p>\n\n\n\n
    Method1: Hello, world!\nMethod2: Hello, world!<\/code><\/pre>\n\n\n\n
    \u4f60\u8fd8\u53ef\u4ee5\u4f7f\u7528 -<\/code> \u8fd0\u7b97\u7b26\u6765\u79fb\u9664\u59d4\u6258\u94fe\u4e2d\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n
    4. \u59d4\u6258\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012<\/strong><\/h2>\n\n\n\n
    \u59d4\u6258\u4f7f\u5f97\u65b9\u6cd5\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u53d8\u5f97\u975e\u5e38\u5bb9\u6613\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5c55\u793a\u5982\u4f55\u5c06\u59d4\u6258\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u53e6\u4e00\u4e2a\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
    public class DelegateAsParameterExample\n{\n    public static void Main()\n    {\n        \/\/ \u5b9a\u4e49\u59d4\u6258\n        MyDelegate del = new MyDelegate(PrintMessage);\n\n        \/\/ \u5c06\u59d4\u6258\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\n        InvokeDelegate(del, \"Hello from the delegate!\");\n    }\n\n    public static void InvokeDelegate(MyDelegate del, string message)\n    {\n        del(message);  \/\/ \u8c03\u7528\u4f20\u9012\u8fc7\u6765\u7684\u59d4\u6258\n    }\n\n    public static void PrintMessage(string message)\n    {\n        Console.WriteLine(message);\n    }\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/p>\n\n\n\n
    Hello from the delegate!<\/code><\/pre>\n\n\n\n
    5. \u533f\u540d\u65b9\u6cd5\u548c Lambda \u8868\u8fbe\u5f0f<\/strong><\/h2>\n\n\n\n
    C# \u5141\u8bb8\u4f7f\u7528\u533f\u540d\u65b9\u6cd5<\/strong>\u6216Lambda \u8868\u8fbe\u5f0f<\/strong>\u6765\u521b\u5efa\u59d4\u6258\u5b9e\u4f8b\u3002\u8fd9\u4f7f\u5f97\u59d4\u6258\u66f4\u52a0\u7075\u6d3b\u3002<\/p>\n\n\n\n
    \u4f7f\u7528\u533f\u540d\u65b9\u6cd5<\/h3>\n\n\n\n
    public class AnonymousMethodExample\n{\n    public static void Main()\n    {\n        MyDelegate del = delegate (string message)\n        {\n            Console.WriteLine(\"Anonymous method: \" + message);\n        };\n\n        del(\"Hello, anonymous method!\");\n    }\n}<\/code><\/pre>\n\n\n\n
    \u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f<\/h3>\n\n\n\n
    public class LambdaExpressionExample\n{\n    public static void Main()\n    {\n        MyDelegate del = (message) => { Console.WriteLine(\"Lambda expression: \" + message); };\n\n        del(\"Hello, lambda expression!\");\n    }\n}<\/code><\/pre>\n\n\n\n
    6. \u59d4\u6258\u4e0e\u4e8b\u4ef6<\/strong><\/h2>\n\n\n\n
    \u5728 C# \u4e2d\uff0c\u59d4\u6258\u901a\u5e38\u4e0e\u4e8b\u4ef6<\/strong>\u4e00\u8d77\u4f7f\u7528\u3002\u4e8b\u4ef6\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u59d4\u6258\uff0c\u7528\u4e8e\u5bf9\u8c61\u4e0e\u5176\u4ed6\u5bf9\u8c61\u4e4b\u95f4\u7684\u901a\u4fe1\u3002\u4e8b\u4ef6\u5141\u8bb8\u5bf9\u8c61\u8ba2\u9605\uff08\u8ba2\u9605\u8005\uff09\u548c\u53d1\u5e03\uff08\u53d1\u5e03\u8005\uff09\u6d88\u606f\uff0c\u800c\u65e0\u9700\u77e5\u9053\u5176\u4ed6\u5bf9\u8c61\u7684\u5b9e\u73b0\u7ec6\u8282\u3002<\/p>\n\n\n\n
    \u4e8b\u4ef6\u7684\u4f7f\u7528\u793a\u4f8b\uff1a<\/h3>\n\n\n\n
    using System;\n\npublic class EventPublisher\n{\n    \/\/ \u5b9a\u4e49\u4e00\u4e2a\u4e8b\u4ef6\n    public event MyDelegate MyEvent;\n\n    public void TriggerEvent(string message)\n    {\n        \/\/ \u89e6\u53d1\u4e8b\u4ef6\n        MyEvent?.Invoke(message);\n    }\n}\n\npublic class EventListener\n{\n    public void HandleEvent(string message)\n    {\n        Console.WriteLine(\"Event received: \" + message);\n    }\n}\n\npublic class EventExample\n{\n    public static void Main()\n    {\n        EventPublisher publisher = new EventPublisher();\n        EventListener listener = new EventListener();\n\n        \/\/ \u8ba2\u9605\u4e8b\u4ef6\n        publisher.MyEvent += listener.HandleEvent;\n\n        \/\/ \u89e6\u53d1\u4e8b\u4ef6\n        publisher.TriggerEvent(\"Event triggered!\");\n    }\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/p>\n\n\n\n
    Event received: Event triggered!<\/code><\/pre>\n\n\n\n
    7. \u59d4\u6258\u7684\u9ad8\u7ea7\u7279\u6027<\/strong><\/h2>\n\n\n\n
      \n
    • Func \u59d4\u6258<\/strong>\uff1a\u7528\u4e8e\u8868\u793a\u8fd4\u56de\u503c\u7684\u65b9\u6cd5\uff0c\u6700\u591a\u53ef\u4ee5\u6709 16 \u4e2a\u53c2\u6570\u3002<\/li>\n<\/ul>\n\n\n\n
        Func<int, int, int> add = (x, y) => x + y;\n  Console.WriteLine(add(5, 3));  \/\/ \u8f93\u51fa\uff1a8<\/code><\/pre>\n\n\n\n
        \n
      • Action \u59d4\u6258<\/strong>\uff1a\u7528\u4e8e\u8868\u793a\u6ca1\u6709\u8fd4\u56de\u503c\u7684\u65b9\u6cd5\uff0c\u6700\u591a\u53ef\u4ee5\u6709 16 \u4e2a\u53c2\u6570\u3002<\/li>\n<\/ul>\n\n\n\n
          Action<string> printMessage = (message) => Console.WriteLine(message);\n  printMessage(\"Hello from Action!\");  \/\/ \u8f93\u51fa\uff1aHello from Action!<\/code><\/pre>\n\n\n\n
          \n
        • Predicate \u59d4\u6258<\/strong>\uff1a\u7528\u4e8e\u8868\u793a\u8fd4\u56de bool<\/code> \u7c7b\u578b\u7ed3\u679c\u7684\u65b9\u6cd5\uff0c\u901a\u5e38\u7528\u4e8e\u6761\u4ef6\u5224\u65ad\u3002<\/li>\n<\/ul>\n\n\n\n
            Predicate<int> isEven = (number) => number % 2 == 0;\n  Console.WriteLine(isEven(4));  \/\/ \u8f93\u51fa\uff1aTrue<\/code><\/pre>\n\n\n\n
          \u5c0f\u7ed3<\/h2>\n\n\n\n
            \n
          • \u59d4\u6258<\/strong>\u662f\u4e00\u79cd\u7c7b\u578b\u5b89\u5168\u7684\u51fd\u6570\u6307\u9488\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u4e8b\u4ef6\u9a71\u52a8\u548c\u56de\u8c03\u673a\u5236\u3002<\/li>\n\n\n\n
          • \u53ef\u4ee5\u901a\u8fc7\u591a\u64ad\u59d4\u6258<\/strong>\u5c06\u591a\u4e2a\u65b9\u6cd5\u5173\u8054\u5230\u4e00\u4e2a\u59d4\u6258\u5b9e\u4f8b\u3002<\/li>\n\n\n\n
          • \u59d4\u6258\u53ef\u4ee5\u4f5c\u4e3a\u65b9\u6cd5\u53c2\u6570\u4f20\u9012\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u5177\u7075\u6d3b\u6027\u3002<\/li>\n\n\n\n
          • \u533f\u540d\u65b9\u6cd5<\/strong>\u548cLambda \u8868\u8fbe\u5f0f<\/strong>\u4f7f\u5f97\u59d4\u6258\u7684\u5b9a\u4e49\u66f4\u52a0\u7b80\u6d01\u3002<\/li>\n\n\n\n
          • \u59d4\u6258\u901a\u5e38\u4e0e\u4e8b\u4ef6\u673a\u5236\u4e00\u8d77\u4f7f\u7528\uff0c\u662f\u5b9e\u73b0\u677e\u8026\u5408\u7684\u5e38\u89c1\u65b9\u5f0f\u3002<\/li>\n<\/ul>\n\n\n\n
            \u59d4\u6258\u5728 C# \u4e2d\u662f\u4e00\u4e2a\u975e\u5e38\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u4e8b\u4ef6\u5904\u7406\u3001\u5f02\u6b65\u7f16\u7a0b\u3001\u56de\u8c03\u7b49\u591a\u79cd\u573a\u666f\u3002\u901a\u8fc7\u59d4\u6258\uff0c\u7a0b\u5e8f\u53ef\u4ee5\u66f4\u52a0\u7075\u6d3b\u5730\u8fdb\u884c\u65b9\u6cd5\u8c03\u7528\u548c\u4e8b\u4ef6\u5904\u7406\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
            \u5728 C# \u4e2d\uff0c\u59d4\u6258\u662f\u4e00\u79cd\u7c7b\u578b\u5b89\u5168\u7684\u51fd\u6570\u6307\u9488\u3002\u59d4\u6258\u53ef\u4ee5\u7528\u6765\u5c06\u65b9\u6cd5\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u5176\u4ed6\u65b9\u6cd5\uff0c\u6216\u8005\u7528\u4e8e\u4e8b\u4ef6\u548c\u56de\u8c03\u673a\u5236\u3002 […]<\/p>\n","protected":false},"author":1,"featured_media":3583,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83],"tags":[],"class_list":["post-3582","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\/3582","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=3582"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3582\/revisions"}],"predecessor-version":[{"id":3584,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3582\/revisions\/3584"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3583"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3582"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}