C#中异步回调函数用法实例
本文实例讲述了C#中异步回调函数用法。分享给大家供大家参考。具体如下:
staticvoidMain(string[]args) { Func<string,string>showMessage=ShowMessage; //设置了回调函数Completed,不能有返回值 IAsyncResultresult=showMessage.BeginInvoke("测试异步委托",newAsyncCallback(Completed),null); //半段异步是否结束 while(!result.IsCompleted) { Console.WriteLine("主线程可以进行其它的操作!"); } Console.ReadLine(); } staticstringShowMessage(stringx) { stringcurrent=string.Format("当前线程id为{0}",Thread.CurrentThread.ManagedThreadId); Thread.Sleep(3000); returnstring.Format("{0},输入为{1}",current,x); } staticvoidCompleted(IAsyncResultresult) { Console.WriteLine("异步完成!"); //获取委托对象,并用EndInvoke方法获取返回结果 AsyncResult_result=(AsyncResult)result; Func<string,string>showMessage=(Func<string,string>)_result.AsyncDelegate; //结束异步操作并输出 Console.WriteLine(showMessage.EndInvoke(_result)); }
希望本文所述对大家的C#程序设计有所帮助。