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异步委托主要用于解决 ThreadPool.QueueUserWorkItem 没有提供获取线程执行完成后的返回值问题。异步委托只能在.Net Framework 框架下使用#xff0c;.Net Core中会报平台错误#xff0c;而且使用Task.Result来获取返回值#xff0c;可以达成同样的目的#xff…写在前面
异步委托主要用于解决 ThreadPool.QueueUserWorkItem 没有提供获取线程执行完成后的返回值问题。异步委托只能在.Net Framework 框架下使用.Net Core中会报平台错误而且使用Task.Result来获取返回值可以达成同样的目的本文纯粹是做个验证试验。
代码实现 static void Main(string[] args){AsyncResultTest();Console.WriteLine(OK);Console.ReadKey();}public static void AsyncResultTest(){var str hello;var testOb new TestOb() { msg str };FuncTestOb, int testMethod Dosomething;//testMethod.BeginInvoke(testOb, Done, testMethod);var asyncResult testMethod.BeginInvoke(testOb, null, null);var task01 Task.Factory.StartNew(() {Thread.Sleep(1000);testOb.msg hello world;Console.WriteLine($task01 exceuted str is {testOb.msg});});task01.Wait();var result testMethod.EndInvoke(asyncResult);Console.WriteLine($AsyncResultTest finished, result is {result});}private static int Dosomething(TestOb testOb){Console.WriteLine($Dosomething:{testOb.msg});Thread.Sleep(2000);return testOb.msg.Length;}private static void Done(IAsyncResult result){var asyncState (FuncTestOb, int)result.AsyncState;var retVal asyncState.EndInvoke(result);Console.WriteLine($result is:{retVal});}class TestOb{public string msg { get; set; }}
执行结果 .Net Core 下实现类似效果的代码 public static void TaskReturnValueTest(){var value 000;var task01 Task.Factory.StartNew(() {value 111;Thread.Sleep(1000);Console.WriteLine($task01 exceuted value is {value}.);return 1;});var task02 Task.Factory.StartNew(() {Thread.Sleep(800);value 222;Console.WriteLine($task02 exceuted value is {value}.);return 2;});Task.WaitAll(task01, task02);var ret01 task01.Result;var ret02 task02.Result;Console.WriteLine($task01: {ret01}, task02: {ret02});Console.WriteLine(Ok);}
执行结果 总结
用Task类库的代码实现方式明显更优更易于理解和维护。
