{"id":3602,"date":"2025-04-20T19:17:17","date_gmt":"2025-04-20T11:17:17","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3602"},"modified":"2025-04-20T19:17:17","modified_gmt":"2025-04-20T11:17:17","slug":"c-%e5%8c%bf%e5%90%8d%e6%96%b9%e6%b3%95%e6%8b%93%e5%b1%95%e5%86%85%e5%ae%b9","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%e6%8b%93%e5%b1%95%e5%86%85%e5%ae%b9\/","title":{"rendered":"C# \u533f\u540d\u65b9\u6cd5\u62d3\u5c55\u5185\u5bb9"},"content":{"rendered":"\n

\u63a5\u4e0a\u7bc7\u6587\u7ae0\uff0c\u672c\u7bc7\u6211\u4eec\u7ee7\u7eed\u8fdb\u9636\u8865\u5145<\/strong> C# \u533f\u540d\u65b9\u6cd5\u7684\u4f7f\u7528\uff0c\u6d89\u53ca\u59d4\u6258\u94fe\u3001\u591a\u7ebf\u7a0b\u3001\u8bbe\u8ba1\u6a21\u5f0f\u3001IL \u7f16\u8bd1\u539f\u7406\u7b49\u4e13\u4e1a\u5185\u5bb9\uff0c\u5e2e\u4f60\u5f7b\u5e95\u638c\u63e1\u8fd9\u95e8\u6280\u672f \u3002<\/p>\n\n\n\n

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1. \u533f\u540d\u65b9\u6cd5 + \u59d4\u6258\u94fe\u7ec4\u5408\uff08Multicast Delegate\uff09<\/h2>\n\n\n\n

\u533f\u540d\u65b9\u6cd5\u53ef\u4ee5\u88ab\u6dfb\u52a0\u5230\u59d4\u6258\u94fe\u4e2d\uff0c\u5b9e\u73b0\u591a\u4e8b\u4ef6\u76d1\u542c \/ \u591a\u4efb\u52a1\u5904\u7406<\/strong>\u3002<\/p>\n\n\n\n

\u793a\u4f8b\uff1a\u591a\u4e2a\u5904\u7406\u5668\u54cd\u5e94\u4e00\u4e2a\u4e8b\u4ef6<\/h3>\n\n\n\n
public delegate void LogHandler(string message);\n\nclass Program\n{\n    static void Main()\n    {\n        LogHandler logger = delegate (string msg) {\n            Console.WriteLine($\"\u63a7\u5236\u53f0\u65e5\u5fd7\uff1a{msg}\");\n        };\n\n        logger += delegate (string msg) {\n            System.IO.File.AppendAllText(\"log.txt\", msg + \"\\n\");\n        };\n\n        logger(\"\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\");\n    }\n}<\/code><\/pre>\n\n\n\n
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2. \u533f\u540d\u65b9\u6cd5 + \u7b56\u7565\u6a21\u5f0f\uff08Strategy\uff09<\/h2>\n\n\n\n
\u533f\u540d\u65b9\u6cd5\u53ef\u4f5c\u4e3a\u7b56\u7565\u4f20\u5165\uff0c\u66ff\u4ee3\u4f20\u7edf\u7684\u547d\u540d\u7b56\u7565\u7c7b\u3002<\/p>\n\n\n\n
\u793a\u4f8b\uff1a<\/h3>\n\n\n\n
public class PriceCalculator\n{\n    public double Calculate(double price, Func<double, double> discountStrategy)\n    {\n        return discountStrategy(price);\n    }\n}\n\nclass Program\n{\n    static void Main()\n    {\n        var calculator = new PriceCalculator();\n\n        double result = calculator.Calculate(100, delegate (double p) {\n            return p * 0.9; \/\/ 10% off\n        });\n\n        Console.WriteLine($\"\u6298\u6263\u540e\u4ef7\u683c\uff1a{result}\");\n    }\n}<\/code><\/pre>\n\n\n\n
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3. \u533f\u540d\u65b9\u6cd5\u5728\u591a\u7ebf\u7a0b \/ \u5e76\u53d1\u73af\u5883\u4e0b\u4f7f\u7528<\/h2>\n\n\n\n
\u533f\u540d\u65b9\u6cd5\u914d\u5408 Thread<\/code> \u6216 Task<\/code>\uff0c\u975e\u5e38\u9002\u5408\u5c01\u88c5\u5c40\u90e8\u4e1a\u52a1\u903b\u8f91<\/strong>\u3002<\/p>\n\n\n\n
using System.Threading;\n\nThread thread = new Thread(delegate ()\n{\n    Console.WriteLine($\"\u5b50\u7ebf\u7a0b\u6267\u884c\u4e2d\uff0c\u7ebf\u7a0bID={Thread.CurrentThread.ManagedThreadId}\");\n});\nthread.Start();<\/code><\/pre>\n\n\n\n
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\u2705 \u6ce8\u610f\u95ed\u5305\u9677\u9631\uff1a\u533f\u540d\u65b9\u6cd5\u8bbf\u95ee\u7684\u53d8\u91cf\u662f\u5f15\u7528\uff0c\u4e0d\u662f\u62f7\u8d1d\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n
for (int i = 0; i < 3; i++)\n{\n    Thread t = new Thread(delegate () {\n        Console.WriteLine(i);  \/\/ \u8f93\u51fa\u53ef\u80fd\u662f 3,3,3\uff08\u4e0d\u662f 0,1,2\uff09\n    });\n    t.Start();\n}<\/code><\/pre>\n\n\n\n
\u89e3\u51b3\u65b9\u6cd5\u662f\u6355\u83b7\u4e34\u65f6\u53d8\u91cf\uff1a<\/p>\n\n\n\n
for (int i = 0; i < 3; i++)\n{\n    int temp = i;\n    Thread t = new Thread(delegate () {\n        Console.WriteLine(temp);  \/\/ \u6b63\u786e\u8f93\u51fa 0,1,2\n    });\n    t.Start();\n}<\/code><\/pre>\n\n\n\n
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4. \u533f\u540d\u65b9\u6cd5\u7528\u4e8e\u4e8b\u4ef6\u76d1\u542c\u4e0e\u89e3\u7ed1<\/h2>\n\n\n\n
\u4f60\u4e0d\u80fd\u76f4\u63a5 -=<\/code> \u533f\u540d\u65b9\u6cd5\uff0c\u9664\u975e\u4fdd\u5b58\u5f15\u7528\uff1a<\/p>\n\n\n\n
EventHandler handler = delegate { Console.WriteLine(\"\u70b9\u51fb\"); };\nbutton.Click += handler;\nbutton.Click -= handler;  \/\/ \u2705 \u6709\u5f15\u7528\u624d\u80fd\u89e3\u9664\u7ed1\u5b9a<\/code><\/pre>\n\n\n\n
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5. IL \u5206\u6790\uff1a\u533f\u540d\u65b9\u6cd5\u662f\u5982\u4f55\u88ab\u7f16\u8bd1\u7684\uff1f<\/h2>\n\n\n\n
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C# \u7f16\u8bd1\u5668\u5c06\u533f\u540d\u65b9\u6cd5\u5c01\u88c5\u6210\u4e00\u4e2a\u79c1\u6709\u7c7b\u4e2d\u7684\u65b9\u6cd5\uff08\u95ed\u5305\u7c7b\uff09<\/strong>\uff0c\u53d8\u91cf\u4f5c\u4e3a\u5b57\u6bb5\u6355\u83b7\u3002<\/p>\n<\/blockquote>\n\n\n\n
\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n\n\n\n
int x = 10;\nFunc<int> f = delegate { return x + 1; };<\/code><\/pre>\n\n\n\n
\u7f16\u8bd1\u540e\u7b49\u6548\u4e3a\uff1a<\/p>\n\n\n\n
class Closure\n{\n    public int x;\n\n    public int AnonymousMethod()\n    {\n        return x + 1;\n    }\n}<\/code><\/pre>\n\n\n\n
\u4f60\u53ef\u4ee5\u4f7f\u7528 ILSpy \u6216 SharpLab.io<\/a> \u67e5\u770b\u7f16\u8bd1\u7ed3\u679c\u3002<\/p>\n\n\n\n
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6. \u6027\u80fd\u5bf9\u6bd4\uff1a\u533f\u540d\u65b9\u6cd5 vs Lambda vs \u663e\u5f0f\u65b9\u6cd5<\/h2>\n\n\n\n
\u9879\u76ee<\/th>\u533f\u540d\u65b9\u6cd5<\/th>Lambda \u8868\u8fbe\u5f0f<\/th>\u666e\u901a\u65b9\u6cd5<\/th><\/tr><\/thead>
\u53ef\u8bfb\u6027<\/td>\u4e00\u822c<\/td>\u2705 \u9ad8<\/td>\u2705 \u9ad8<\/td><\/tr>
\u7f16\u8bd1\u6548\u7387<\/td>\u4e2d<\/td>\u2705 \u9ad8<\/td>\u2705 \u9ad8<\/td><\/tr>
\u6027\u80fd\uff08\u8c03\u7528\uff09<\/td>\u57fa\u672c\u76f8\u540c<\/td>\u2705 \u7a0d\u5feb\uff08\u4f18\u5316\uff09<\/td>\u2705 \u7a0d\u5feb<\/td><\/tr>
\u95ed\u5305\u652f\u6301<\/td>\u2705 \u652f\u6301<\/td>\u2705 \u652f\u6301<\/td>\u2705 \u652f\u6301<\/td><\/tr>
\u7ed3\u6784\u6e05\u6670\u6027<\/td>\u274c\uff08\u53ef\u80fd\u5d4c\u5957\uff09<\/td>\u2705 \u597d<\/td>\u2705 \u975e\u5e38\u597d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\ud83d\udccc \u603b\u7ed3\uff1a<\/p>\n\n\n\n