c#BackgroundWorker取消问题 [英] c# BackgroundWorker cancelling problem

问题描述

我正在起诉backgroundworker做一些耗时的工作，如果我不想等待很长时间才完成，我想取消它.

在我的一份工作中，我可以定期检查CancellationPending，因为我将它放入for语句中，但在循环中，但是还有另一种情况.
假设我要从系统中获取大量数据.在这种情况下，我无法定期检查CancellationPending.
假设dowork在很长一段时间内都无法完成工作，那么如何取消线程?

I am suing backgroundworker do some time consuming work and I want to cancel it if I don''t want to wait long time until it finish.

in one of my dowork I can check the CancelationPending periodically, since I put it in for statement where in loop, but there is another situation.
let''s say that I am going after a large amount of data from our system. In this case I can''t periodically check CancelationPending.
Assuming the dowork is off doing its job for a very long time, how do you cancel the thread?

推荐答案

您不能强制终止后台工作程序，它根本不是为此目的而设计的.

您有3个选项，按照我使用它们的顺序.

1)如果使用.NET 4.0，则可以使用TPL，Sacha Barber撰写了有关该主题的一系列文章.
任务并行库:n之1 [线程教程(X#) [

You can''t force the termination of a background worker, it simply isn''t designed for that.

You have 3 options, in the order in which I would use them.

1) If you use .NET 4.0 you can use the TPL, Sacha Barber has written a series of articles on the subject.
Task Parallel Library: 1 of n[^]

2) You can use the good old System.Threading.Thread
Threading Tutorial (X#)[^]

3) You can get the get the Thread the BackgroundWorker is running on in the DoWork event save it in a field and you can then abort the thread.

private Thread _backgroundWorkerThread;

public void StartBackgroundWorker()
{
    BackgroundWorker backgroundWorker = new BackgroundWorker();
    backgroundWorker.DoWork += DoWork;
    backgroundWorker.RunWorkerAsync();
}

public void AbortBackgroundWorker()
{
    if(_backgroundWorkerThread != null)
        _backgroundWorkerThread.Abort();
}

void DoWork(object sender, DoWorkEventArgs e)
{
    try
    {
        _backgroundWorkerThread = Thread.CurrentThread;

        // Do your work...
    }
    catch(ThreadAbortException)
    {
        // Do your clean up here.
    }
}

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