如何中止/取消 TPL 任务? [英] How do I abort/cancel TPL Tasks?

问题描述

在一个线程中，我创建了一些 System.Threading.Task 并启动每个任务.

In a thread, I create some System.Threading.Task and start each task.

当我执行 .Abort() 来终止线程时，任务不会中止.

When I do a .Abort() to kill the thread, the tasks are not aborted.

如何将 .Abort() 传输到我的任务?

How can I transmit the .Abort() to my tasks ?

推荐答案

你不能.任务使用线程池中的后台线程.也不推荐使用 Abort 方法取消线程.你可以看看 以下博客文章解释了使用取消令牌取消任务的正确方法.举个例子:

You can't. Tasks use background threads from the thread pool. Also canceling threads using the Abort method is not recommended. You may take a look at the following blog post which explains a proper way of canceling tasks using cancellation tokens. Here's an example:

class Program
{
    static void Main()
    {
        var ts = new CancellationTokenSource();
        CancellationToken ct = ts.Token;
        Task.Factory.StartNew(() =>
        {
            while (true)
            {
                // do some heavy work here
                Thread.Sleep(100);
                if (ct.IsCancellationRequested)
                {
                    // another thread decided to cancel
                    Console.WriteLine("task canceled");
                    break;
                }
            }
        }, ct);

        // Simulate waiting 3s for the task to complete
        Thread.Sleep(3000);

        // Can't wait anymore => cancel this task 
        ts.Cancel();
        Console.ReadLine();
    }
}

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