c# Task编程一个task抛出异常后怎么取消其他线程

最新推荐文章于 2025-08-06 08:42:54 发布

转载最新推荐文章于 2025-08-06 08:42:54 发布 · 441 阅读

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原文链接：http://www.cnblogs.com/yy3b2007com/p/4145845.html

文章标签：

#c#

本文介绍如何在C#中使用CancellationTokenSource来管理任务并处理可能抛出的异常，包括如何在任务取消请求时优雅地处理计算结果、数据持久化和状态还原等问题。同时提供了一种避免在每个任务中使用try/catch块的方法，通过TaskContinuation实现更简洁的代码结构。

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

转载于:https://www.cnblogs.com/yy3b2007com/p/4145845.html