How to:Aborting a long running task in TPL

最新推荐文章于 2019-12-19 10:06:43 发布

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最新推荐文章于 2019-12-19 10:06:43 发布

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原文链接：http://www.cnblogs.com/rock_chen/p/3424426.html

本文介绍了一种使用 CancellationToken 来取消正在运行的任务的方法。通过将 CancellationToken 传递给任务，并在任务内部注册一个回调来中止线程，从而实现任务取消。但更推荐的做法是在计算密集型操作中定期检查 CancellationToken 的 IsCancellationRequested 属性或者调用 ThrowIfCancellationRequested 方法来响应取消请求。

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http://social.msdn.microsoft.com/Forums/vstudio/en-US/d0bcb415-fb1e-42e4-90f8-c43a088537fb/aborting-a-long-running-task-in-tpl?forum=parallelextensions

I hesitate to show this :), but if you really did want to use aborts, you could do something like:

    int Foo(CancellationToken token)
    {
        Thread t = Thread.CurrentThread;
        using (token.Register(t.Abort))
        {
            // compute-bound work here
        }
    }

Then, if the token receives a cancellation request, it'll translate that into an abort on the thread running the compute-bound work. Of course, it'd be better if the "crunchy" operation were written to monitor the token, checking its IsCancellationRequest property or calling ThrowIfCancellationRequested every once in a while. This is what methods like Parallel.For and PLINQ do, and it provides for a nice cooperative cancellation mechanism whereby the caller can still be terminated in a timely fashion, but it can do so at a particular point when it's safe.

I hope that helps.

转载于:https://www.cnblogs.com/rock_chen/p/3424426.html