现实生活中，我们往往会遇到，要执行一个线程的方法，假如这个方法特别耗时，我怎么才能在指定的线程超时时间内，取消执行，并把线程销毁！以下是本人总结的常见几种方式!特此做下笔记！

1.使用CancellationTokenSource之基于Task实现方式

CancellationTokenSource source = new CancellationTokenSource();source.CancelAfter(TimeSpan.FromMilliseconds(2000));Task task=Task.Factory.StartNew(() =>{while (true){try{source.Token.ThrowIfCancellationRequested();Console.WriteLine("子方法执行中...");Thread.Sleep(1000);Console.WriteLine("子方法执行完毕...");}catch (OperationCanceledException ex){Console.WriteLine("已捕获取消异常:" + ex.Message);break;}catch (Exception ex){Console.WriteLine("异常:" + ex.Message);break;}}Console.WriteLine("线程已终止");}, source.Token);

2.使用CancellationTokenSource之基于Thread实现方式

 CancellationTokenSource source = new CancellationTokenSource();Thread thread = new Thread(new ThreadStart(() =>{while (true){Console.WriteLine("现在时间:"+DateTime.Now);}}));thread.IsBackground = true;thread.Start();source.Token.Register(() =>{Console.WriteLine("超时时间已到,开始终止线程");thread.Abort();Console.WriteLine("超时时间已到,终止线程完成");});source.CancelAfter(2000);

3.基于Thread.Join()实现

 Thread thread =new Thread(new ThreadStart(() =>{while (true){Console.WriteLine("现在时间:"+DateTime.Now);}}));thread.Start();thread.Join(2000);Console.WriteLine("join超时时间已到,开始终止线程");thread.Abort();Console.WriteLine("join超时时间已到,终止线程完成");

4.基于System.Timers.Timer的实现方式

DateTime dtNow = DateTime.Now;Thread thread = new Thread(new ThreadStart(() =>{while (true){Console.WriteLine("现在时间:" + DateTime.Now);}}));thread.IsBackground = true;thread.Start();System.Timers.Timer timer = new System.Timers.Timer();timer.Interval = 1000;timer.Elapsed += (sender,e) =>{double db=DateTime.Now.Subtract(dtNow).TotalSeconds;if (db > 2)//大于2秒说明已经超时{Console.WriteLine("任务已执行超过了:" + db + "秒");Console.WriteLine("超时时间已到，开始终止线程");thread.Abort();Console.WriteLine("超时时间已到，终止线程完成");timer.Stop();}};timer.Start();

5.基于信号量和CancellationTokenSource的实现方式

AutoResetEvent autoReset = new AutoResetEvent(false);CancellationTokenSource source = new CancellationTokenSource();Task.Factory.StartNew(() =>{try{while (true){source.Token.ThrowIfCancellationRequested();Console.WriteLine("子线程:Work starting.");// Simulate time spent working.Thread.Sleep(5000);//new Random().Next(500, 2000)autoReset.Set();// Signal that work is finished.Console.WriteLine("子线程:Work ending.");}}catch (Exception e){autoReset.Set();Console.WriteLine("子线程收到异常:"+e.Message+",线程退出!");// throw;}}, source.Token);Console.WriteLine("主线程只等待1秒");autoReset.WaitOne(1000);//等待超过1秒，则需要取消该线程Console.WriteLine("主线程等待超时,开始继续执行,同时调用Source.Cancel()");source.Cancel();