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();