\u3010C#\u96f6\u57fa\u7840\u8fdb\u9636\u3011\u59d4\u6258（Delegate）\u8d85\u8be6\u7ec6\u7cbe\u8bb2，\u4ece\u539f\u7406\u5230\u5b9e\u6218\u5168\u8986\u76d6
\n📌 \u524d\u8a00
\n\u5f88\u591aC#\u521d\u5b66\u8005\u5728\u5b66\u4e60\u59d4\u6258\u3001\u4e8b\u4ef6\u3001Lambda\u8868\u8fbe\u5f0f\u65f6，\u603b\u4f1a\u611f\u5230\u56f0\u60d1：\u59d4\u6258\u5230\u5e95\u662f\u4ec0\u4e48？\u4e3a\u4ec0\u4e48\u8981\u7528\u59d4\u6258？\u59d4\u6258\u548c\u65b9\u6cd5\u6709\u4ec0\u4e48\u533a\u522b？
\n\u59d4\u6258\u662fC#\u4e2d\u9762\u5411\u5bf9\u8c61\u3001\u56de\u8c03\u7f16\u7a0b\u3001\u4e8b\u4ef6\u673a\u5236\u3001\u5f02\u6b65\u7f16\u7a0b\u3001\u6846\u67b6\u8bbe\u8ba1\u7684\u6838\u5fc3\u57fa\u7840，\u51e0\u4e4e\u6240\u6709.NET\u9ad8\u7ea7\u7279\u6027\u90fd\u57fa\u4e8e\u59d4\u6258\u5b9e\u73b0\u3002\u5403\u900f\u59d4\u6258，\u624d\u80fd\u771f\u6b63\u7406\u89e3C#\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u601d\u60f3\u3001\u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b\u3002
\n\u672c\u6587\u5c06\u4ece\u96f6\u5f00\u59cb，\u901a\u4fd7\u6613\u61c2\u8bb2\u89e3\u59d4\u6258\u7684\u5168\u90e8\u6838\u5fc3\u77e5\u8bc6\u70b9，\u642d\u914d\u53ef\u76f4\u63a5\u8fd0\u884c\u7684\u4ee3\u7801\u6848\u4f8b，\u5e2e\u52a9\u4f60\u4eec\u7406\u89e3\u3002<\/p>\n
\u4e00\u3001\u4ec0\u4e48\u662f\u59d4\u6258？（\u6838\u5fc3\u5b9a\u4e49）
\n1.1 \u5b98\u65b9\u5b9a\u4e49
\n\u59d4\u6258（Delegate）\u662f\u4e00\u79cd\u7528\u6765\u5b58\u50a8\u3001\u4f20\u9012\u3001\u8c03\u7528\u65b9\u6cd5\u7684\u5f15\u7528\u7c7b\u578b\u3002
\n\u7b80\u5355\u6765\u8bf4：\u59d4\u6258\u5c31\u662f\u65b9\u6cd5\u7684\u5bb9\u5668，\u662f\u65b9\u6cd5\u7684\u201c\u66ff\u8eab\u201d\u3002
\n1.2 \u901a\u4fd7\u7406\u89e3
\n\u666e\u901a\u53d8\u91cf\u5b58\u50a8\u7684\u662f\u6570\u636e（int\u3001string\u3001\u6570\u7ec4\u7b49）；
\n\u59d4\u6258\u53d8\u91cf\u5b58\u50a8\u7684\u662f\u65b9\u6cd5（\u65b9\u6cd5\u7684\u5730\u5740\u3001\u65b9\u6cd5\u7684\u903b\u8f91）\u3002
\n\u6211\u4eec\u53ef\u4ee5\u628a\u65b9\u6cd5\u8d4b\u503c\u7ed9\u59d4\u6258\u3001\u628a\u59d4\u6258\u5f53\u505a\u53c2\u6570\u4f20\u9012\u3001\u5728\u4efb\u610f\u4f4d\u7f6e\u901a\u8fc7\u59d4\u6258\u6267\u884c\u5bf9\u5e94\u7684\u65b9\u6cd5\u3002
\n1.3 \u59d4\u6258\u7684\u672c\u8d28<\/p>\n
\u4e8c\u3001\u59d4\u6258\u7684\u8bed\u6cd5\u4e0e\u57fa\u7840\u4f7f\u7528
\n2.1 \u59d4\u6258\u7684\u58f0\u660e\u8bed\u6cd5
\n\/\/ \u8bed\u6cd5：\u4fee\u9970\u7b26 delegate \u8fd4\u56de\u503c\u7c7b\u578b \u59d4\u6258\u540d(\u53c2\u6570\u5217\u8868);
\npublic delegate void MyDelegate(string msg);
\n\u58f0\u660e\u89c4\u5219：<\/p>\n
namespace DelegateDemo
\n{
\n\/\/ 1. \u58f0\u660e\u59d4\u6258（\u65e0\u8fd4\u56de\u503c\u3001string\u53c2\u6570）
\npublic delegate void ShowMsgDelegate(string msg);<\/p>\n
class Program
\n{
\n static void Main(string[] args)
\n {
\n \/\/ 3. \u5b9e\u4f8b\u5316\u59d4\u6258，\u7ed1\u5b9a\u65b9\u6cd5
\n ShowMsgDelegate del = ShowMessage;<\/p>\n
\/\/ \u6267\u884c\u59d4\u6258（\u8c03\u7528\u7ed1\u5b9a\u7684\u65b9\u6cd5）
\n del("Hello C#\u59d4\u6258！");
\n del("CSDN\u6280\u672f\u5206\u4eab");
\n }<\/p>\n
\/\/ 2. \u5b9a\u4e49\u548c\u59d4\u6258\u7b7e\u540d\u5339\u914d\u7684\u65b9\u6cd5
\n public static void ShowMessage(string message)
\n {
\n Console.WriteLine($"\u8f93\u51fa\u4fe1\u606f：{message}");
\n }
\n}<\/p>\n
}
\n\u8fd0\u884c\u7ed3\u679c：
\n\u8f93\u51fa\u4fe1\u606f：Hello C#\u59d4\u6258！
\n\u8f93\u51fa\u4fe1\u606f：CSDN\u6280\u672f\u5206\u4eab<\/p>\n
\u4e09\u3001\u59d4\u6258\u7684\u6838\u5fc3\u7279\u6027
\n3.1 \u7c7b\u578b\u5b89\u5168（\u6700\u6838\u5fc3\u4f18\u52bf）
\n\u59d4\u6258\u4f1a\u4e25\u683c\u6821\u9a8c\u8fd4\u56de\u503c\u7c7b\u578b\u3001\u53c2\u6570\u4e2a\u6570\u3001\u53c2\u6570\u7c7b\u578b\u3001\u53c2\u6570\u987a\u5e8f，\u4e0d\u5339\u914d\u76f4\u63a5\u7f16\u8bd1\u62a5\u9519，\u907f\u514d\u4e86C\u8bed\u8a00\u51fd\u6570\u6307\u9488\u7684\u4e0d\u5b89\u5168\u95ee\u9898\u3002
\n\u4f8b：\u59d4\u6258\u662f void (string)，\u5c31\u4e0d\u80fd\u7ed1\u5b9a int (int) \u7c7b\u578b\u7684\u65b9\u6cd5\u3002
\n3.2 \u59d4\u6258\u53ef\u4ee5\u4f5c\u4e3a\u65b9\u6cd5\u53c2\u6570（\u56de\u8c03\u6838\u5fc3）
\n\u8fd9\u662f\u59d4\u6258\u6700\u5e38\u7528\u3001\u6700\u91cd\u8981\u7684\u573a\u666f：\u5c06\u65b9\u6cd5\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012，\u5b9e\u73b0\u56de\u8c03\u903b\u8f91\u3001\u89e3\u8026\u4ee3\u7801\u3002
\n\u5b9e\u6218\u6848\u4f8b：\u901a\u7528\u8ba1\u7b97\u5668
\nusing System;<\/p>\n
namespace DelegateDemo
\n{
\n\/\/ \u58f0\u660e\u8ba1\u7b97\u59d4\u6258
\npublic delegate int CalcDelegate(int a, int b);<\/p>\n
class Program
\n{
\n static void Main(string[] args)
\n {
\n \/\/ \u4f20\u9012\u4e0d\u540c\u65b9\u6cd5，\u5b9e\u73b0\u4e0d\u540c\u8ba1\u7b97\u903b\u8f91
\n Calc(10, 20, Add);
\n Calc(10, 20, Sub);
\n }<\/p>\n
\/\/ \u901a\u7528\u8ba1\u7b97\u65b9\u6cd5：\u59d4\u6258\u4f5c\u4e3a\u53c2\u6570
\n public static void Calc(int num1, int num2, CalcDelegate func)
\n {
\n int res = func(num1, num2);
\n Console.WriteLine($"\u8ba1\u7b97\u7ed3\u679c：{res}");
\n }<\/p>\n
\/\/ \u52a0\u6cd5\u65b9\u6cd5
\n public static int Add(int a, int b) => a + b;
\n \/\/ \u51cf\u6cd5\u65b9\u6cd5
\n public static int Sub(int a, int b) => a – b;
\n}<\/p>\n
}
\n\u6838\u5fc3\u4f18\u52bf：\u65e0\u9700\u4fee\u6539Calc\u65b9\u6cd5，\u53ea\u9700\u8981\u4f20\u5165\u4e0d\u540c\u65b9\u6cd5，\u5c31\u80fd\u6269\u5c55\u65b0\u529f\u80fd，\u5b8c\u7f8e\u7b26\u5408\u5f00\u95ed\u539f\u5219\u3002
\n3.3 \u591a\u64ad\u59d4\u6258（\u4e00\u4e2a\u59d4\u6258\u7ed1\u5b9a\u591a\u4e2a\u65b9\u6cd5）
\n\u59d4\u6258\u652f\u6301 +=\u3001-= \u64cd\u4f5c，\u53ef\u4ee5\u7ed1\u5b9a\/\u89e3\u7ed1\u591a\u4e2a\u65b9\u6cd5，\u6267\u884c\u65f6\u4f1a\u6309\u7ed1\u5b9a\u987a\u5e8f\u4f9d\u6b21\u6267\u884c\u6240\u6709\u65b9\u6cd5\u3002
\n\u26a0\ufe0f \u6ce8\u610f：\u6709\u8fd4\u56de\u503c\u7684\u591a\u64ad\u59d4\u6258，\u53ea\u4f1a\u83b7\u53d6\u6700\u540e\u4e00\u4e2a\u65b9\u6cd5\u7684\u8fd4\u56de\u503c，\u524d\u9762\u7684\u8fd4\u56de\u503c\u4f1a\u88ab\u4e22\u5f03，\u65e5\u5e38\u5f00\u53d1\u4e2d\u591a\u64ad\u59d4\u6258\u57fa\u672c\u90fd\u7528\u65e0\u8fd4\u56de\u503c\u7c7b\u578b\u3002
\n\u591a\u64ad\u59d4\u6258\u6848\u4f8b
\nusing System;<\/p>\n
namespace DelegateDemo
\n{
\npublic delegate void MultiDelegate();<\/p>\n
class Program
\n{
\n static void Main(string[] args)
\n {
\n MultiDelegate del = null;<\/p>\n
\/\/ \u7ed1\u5b9a\u591a\u4e2a\u65b9\u6cd5
\n del += Method1;
\n del += Method2;
\n del += Method3;<\/p>\n
\/\/ \u6267\u884c\u6240\u6709\u7ed1\u5b9a\u7684\u65b9\u6cd5
\n del();<\/p>\n
Console.WriteLine("=====\u89e3\u7ed1\u4e00\u4e2a\u65b9\u6cd5\u540e=====");<\/p>\n
\/\/ \u89e3\u7ed1\u65b9\u6cd52
\n del -= Method2;
\n del();
\n }<\/p>\n
public static void Method1() => Console.WriteLine("\u6267\u884c\u65b9\u6cd51");
\n public static void Method2() => Console.WriteLine("\u6267\u884c\u65b9\u6cd52");
\n public static void Method3() => Console.WriteLine("\u6267\u884c\u65b9\u6cd53");
\n}<\/p>\n
}<\/p>\n
\u56db\u3001.NET\u5185\u7f6e\u901a\u7528\u59d4\u6258（\u4e0d\u7528\u624b\u52a8\u58f0\u660e）
\n\u65e5\u5e38\u5f00\u53d1\u4e2d，90%\u573a\u666f\u4e0d\u9700\u8981\u81ea\u5df1\u58f0\u660e\u59d4\u6258，.NET \u5185\u7f6e\u4e86\u4e09\u5957\u901a\u7528\u59d4\u6258，\u8986\u76d6\u6240\u6709\u5e38\u7528\u573a\u666f：
\n4.1 Action \u59d4\u6258（\u65e0\u8fd4\u56de\u503c）<\/p>\n
namespace DelegateDemo
\n{
\nclass Program
\n{
\nstatic void Main(string[] args)
\n{
\n\/\/ Action \u4f7f\u7528
\nAction show = msg => Console.WriteLine($\u201cAction\u8f93\u51fa：{msg}\u201d);
\nshow(\u201c\u6d4b\u8bd5Action\u59d4\u6258\u201d);<\/p>\n
\/\/ Func \u4f7f\u7528
\n Func<int, int, int> add = (a, b) => a + b;
\n Console.WriteLine($"Func\u8ba1\u7b97\u7ed3\u679c：{add(20,30)}");<\/p>\n
\/\/ Predicate \u4f7f\u7528
\n Predicate<int> isOdd = num => num % 2 != 0;
\n Console.WriteLine($"5\u662f\u5426\u662f\u5947\u6570：{isOdd(5)}");
\n }
\n}<\/p>\n
}<\/p>\n
\u4e94\u3001\u59d4\u6258\u4e0eLambda\u8868\u8fbe\u5f0f\u7684\u5173\u7cfb
\nLambda\u8868\u8fbe\u5f0f\u5c31\u662f\u59d4\u6258\u7684\u7b80\u5199\u5f62\u5f0f，\u7528\u4e8e\u5feb\u901f\u751f\u6210\u533f\u540d\u59d4\u6258\u65b9\u6cd5，\u7b80\u5316\u4ee3\u7801\u3002
\n\u6240\u6709Lambda\u8868\u8fbe\u5f0f，\u6700\u7ec8\u90fd\u4f1a\u7f16\u8bd1\u4e3a\u59d4\u6258\u5bf9\u8c61\u3002
\n\u5bf9\u6bd4\u5199\u6cd5（\u4f20\u7edf\u59d4\u6258 vs Lambda）
\n\/\/ 1. \u4f20\u7edf\u533f\u540d\u65b9\u6cd5
\nFunc<int,int> func1 = delegate(int num)
\n{
\nreturn num * num;
\n};<\/p>\n
\/\/ 2. Lambda\u7b80\u5199（\u66f4\u7b80\u6d01）
\nFunc<int,int> func2 = num => num * num;
\n\u65e5\u5e38\u5f00\u53d1\u4e2d，\u4f18\u5148\u4f7f\u7528 Lambda + \u5185\u7f6e\u59d4\u6258，\u6781\u5c11\u624b\u52a8\u58f0\u660e\u81ea\u5b9a\u4e49\u59d4\u6258\u3002<\/p>\n
\u516d\u3001\u59d4\u6258\u7684\u7ecf\u5178\u4f7f\u7528\u573a\u666f<\/p>\n
6.1 \u56de\u8c03\u65b9\u6cd5
\n\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u540e，\u901a\u8fc7\u59d4\u6258\u56de\u8c03\u901a\u77e5\u7ed3\u679c，\u662f\u5f02\u6b65\u7f16\u7a0b\u7684\u57fa\u7840\u3002
\n6.2 \u4e8b\u4ef6\u9a71\u52a8（Winform\/WPF\/Unity）
\n\u4e8b\u4ef6\u672c\u8d28\u662f\u5c01\u88c5\u540e\u7684\u59d4\u6258，\u6240\u6709\u6309\u94ae\u70b9\u51fb\u3001\u7a97\u53e3\u4e8b\u4ef6\u3001Unity\u751f\u547d\u5468\u671f\u4e8b\u4ef6，\u5168\u90e8\u57fa\u4e8e\u59d4\u6258\u5b9e\u73b0\u3002
\n6.3 \u96c6\u5408\u9ad8\u7ea7\u64cd\u4f5c（LINQ）
\nLINQ\u7684 Where\u3001Select\u3001OrderBy \u7b49\u65b9\u6cd5，\u53c2\u6570\u5168\u90e8\u662f Func\/Predicate \u59d4\u6258\u3002
\nList list = new List{1,2,3,4,5};
\n\/\/ Where\u53c2\u6570\u662fPredicate\u59d4\u6258
\nvar res = list.Where(x => x > 3);
\n6.4 \u89e3\u8026\u4ee3\u7801\u3001\u5b9e\u73b0\u63d2\u4ef6\u5316
\n\u901a\u8fc7\u59d4\u6258\u4f20\u9012\u903b\u8f91，\u8ba9\u6838\u5fc3\u4ee3\u7801\u548c\u4e1a\u52a1\u4ee3\u7801\u5206\u79bb，\u63d0\u5347\u4ee3\u7801\u6269\u5c55\u6027\u3002<\/p>\n
\u4e03\u3001\u59d4\u6258\u5e38\u89c1\u6613\u9519\u70b9\u4e0e\u907f\u5751\u6307\u5357
\n7.1 \u672a\u521d\u59cb\u5316\u59d4\u6258\u5bfc\u81f4\u7a7a\u6307\u9488\u5f02\u5e38
\n\u59d4\u6258\u9ed8\u8ba4\u503c\u4e3anull，\u76f4\u63a5\u8c03\u7528\u4f1a\u62a5\u9519，\u5efa\u8bae\u5148\u5224\u7a7a：
\nif(del != null)
\n{
\ndel();
\n}
\n\/\/ \u7b80\u5199\u65b9\u5f0f
\ndel?.Invoke();
\n7.2 \u591a\u64ad\u59d4\u6258\u8fd4\u56de\u503c\u4e22\u5931
\n\u6709\u8fd4\u56de\u503c\u7684\u591a\u64ad\u59d4\u6258，\u4ec5\u6700\u540e\u4e00\u4e2a\u65b9\u6cd5\u8fd4\u56de\u503c\u751f\u6548，\u524d\u9762\u5168\u90e8\u4e22\u5931，\u4e1a\u52a1\u4e2d\u5c3d\u91cf\u4e0d\u7528\u3002
\n7.3 \u59d4\u6258\u6df7\u6dc6\u91cd\u8f7d\u65b9\u6cd5
\n\u7c7b\u4e2d\u6709\u591a\u4e2a\u91cd\u8f7d\u65b9\u6cd5\u65f6，\u59d4\u6258\u7ed1\u5b9a\u53ef\u80fd\u51fa\u73b0\u6b67\u4e49，\u5efa\u8bae\u624b\u52a8\u6307\u5b9a\u65b9\u6cd5\u7b7e\u540d\u3002<\/p>\n
\u516b\u3001\u59d4\u6258\u4e0e\u4e8b\u4ef6\u7684\u533a\u522b<\/p>\n
\u4e5d\u3001\u5168\u6587\u603b\u7ed3<\/p>\n
\u3010C#\u96f6\u57fa\u7840\u8fdb\u9636\u3011\u59d4\u6258（Delegate）\u8d85\u8be6\u7ec6\u7cbe\u8bb2，\u4ece\u539f\u7406\u5230\u5b9e\u6218\u5168\u8986\u76d6
\n📌 \u524d\u8a00
\n\u5f88\u591aC#\u521d\u5b66\u8005\u5728\u5b66\u4e60\u59d4\u6258\u3001\u4e8b\u4ef6\u3001Lambda\u8868\u8fbe\u5f0f\u65f6，\u603b\u4f1a\u611f\u5230\u56f0\u60d1：\u59d4\u6258\u5230\u5e95\u662f\u4ec0\u4e48？\u4e3a\u4ec0\u4e48\u8981\u7528\u59d4\u6258？\u59d4\u6258\u548c\u65b9\u6cd5\u6709\u4ec0\u4e48\u533a\u522b？
\n\u59d4\u6258\u662fC#\u4e2d\u9762\u5411\u5bf9\u8c61\u3001\u56de\u8c03\u7f16\u7a0b\u3001\u4e8b\u4ef6\u673a\u5236\u3001\u5f02\u6b65\u7f16\u7a0b\u3001\u6846\u67b6\u8bbe\u8ba1\u7684\u6838\u5fc3\u57fa\u7840，\u51e0\u4e4e\u6240\u6709.NET\u9ad8\u7ea7\u7279\u6027\u90fd\u57fa\u4e8e\u59d4\u6258\u5b9e\u73b0\u3002\u5403\u900f\u59d4\u6258ÿ<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,99,100],"topic":[],"class_list":["post-98751","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-java","tag-100"],"yoast_head":"\n