C# 中通过CancellationTokenSource实现对超时任务的取消

在Task中用CancellationTokenSource来取消任务，可以手动 cancelTokenSource.Cancel()取消，还有new时就设置取消时间var cancelTokenSource = new CancellationTokenSource(2000); 也可以在任务中 cancelTokenSource.CancelAfter(2000)实现同样的效果。

            var cancelTokenSource = new CancellationTokenSource();            //var cancelTokenSource = new CancellationTokenSource(2000);
            Task.Run(() =>
            {                //cancelTokenSource.CancelAfter(2000);
                while (!cancelTokenSource.IsCancellationRequested)
                {
                    Console.WriteLine(DateTime.Now);
                    Thread.Sleep(1000);
                }
            }, cancelTokenSource.Token);

            Console.WriteLine("Press any key to cancel");
            Console.ReadLine();
            cancelTokenSource.Cancel();
            Console.WriteLine("Done");