static
void TaskWithCancellation()
{
????var cancellationTokenSource = new CancellationTokenSource();
????var cancellationToken = cancellationTokenSource.Token; //主要用于任务取消操作的信号量设置
?
????Task t = new Task(() =>
????{
????????int i = 0;
????????while (true)
????????{
????????????i++;
????????????Thread.Sleep(1000);
????????????Console.WriteLine("this is task iteration " + i);
?
????????????//注册信号量，如果用户取消，那么将会中断在此处
????????????cancellationToken.ThrowIfCancellationRequested();
?
????????????Console.WriteLine("Test to see if below can be excuted...");
????????????Console.WriteLine("I am not excute");
????????}
????}, cancellationToken);
?
????t.Start(); //开始任务
?
????Thread.Sleep(1000);
?
????cancellationTokenSource.Cancel(); //取消任务
?
????try
????{
????????t.Wait();
????}
????catch (AggregateException e)
????{
????????if (e.InnerException is OperationCanceledException)
????????????Console.WriteLine("the opeartion has been canceled...");
????????else
????????????Console.WriteLine("encounter some unexpected exceptions...");
????}
}
