c# Task编程一个task抛出异常后怎么取消其他线程

从MSDN的Forum上看到别人提供的解决方案，感觉还是比较靠谱，所以就保存下来。

CancellationTokenSource cts = new CancellationTokenSource();

Task t1 = Task.Factory.StartNew(() =>

{

if (!cts.IsCancellationRequested)

{

try

{

//task body that may throw

Console.WriteLine("Task1");

}

catch

{

cts.Cancel();

throw new OperationCanceledException(cts.Token); //the task final state will be Cancelled

//the exception can be ignored if needed

}

if (cts.IsCancellationRequested)

{

//depending on the scenario

//ignore any computed result, do not persist any data, revert all changes

}

}

}, cts.Token);

Task t2 = Task.Factory.StartNew(() =>

{

if (!cts.IsCancellationRequested)

{

try

{

//task body that may throw

Console.WriteLine("Task2");

}

catch

{

cts.Cancel();

throw new OperationCanceledException(cts.Token); //the task final state will be Cancelled

}

if (cts.IsCancellationRequested)

{

//depending on the scenario

//ignore any computed result, do not persist any data, revert all changes

}

}

}, cts.Token);

2.       In case that you would like to avoid try/catch in every body you could use a Task Continuation approach like below. However with this approach, the application will pay the price of new tasks being created. At the same time the Cancellation will be delayed.

CancellationTokenSource cts = new CancellationTokenSource();

Task t1 = Task.Factory.StartNew(() =>

{

if (!cts.IsCancellationRequested)

{

//task body that may throw

Console.WriteLine("Task1");

if (cts.IsCancellationRequested)

{

//depending on the scenario

//ignore any computed result, do not persist any data, revert all changes

}

}

}, cts.Token).ContinueWith((task) =>

{

cts.Cancel();

//observe the exception

Exception ex = task.Exception;

}, TaskContinuationOptions.OnlyOnFaulted|TaskContinuationOptions.ExecuteSynchronously );

Task t2 = Task.Factory.StartNew(() =>

{

if (!cts.IsCancellationRequested)

{

//task body that may throw

Console.WriteLine("Task2");

if (cts.IsCancellationRequested)

{

//depending on the scenario

//ignore any computed result, do not persist any data, revert all changes

}

}

}, cts.Token).ContinueWith((task) =>

{

cts.Cancel();

//observe the exception

Exception ex = task.Exception;

}, TaskContinuationOptions.OnlyOnFaulted | TaskContinuationOptions.ExecuteSynchronously);

参考，转载：

https://social.msdn.microsoft.com/Forums/vstudio/en-US/2cbe1fa7-c7dd-4e88-8773-2e3bb1665e2e/how-to-cancel-other-task-when-there-is-an-exception-in-one-of-the-task?forum=parallelextensions