背景工人阶级取消，取消设置标志位，但不退出 [英] background worker class cancellation, sets cancellation pending flag but doesn't quit

问题描述

我叫
obackgroundworker.CancelAsync（）;在后台工作目前正在做在另一个线程一些工作，然后用
，而（obackgroundworker.IsBusy ==真）
，来等待它退出应用程序（万一用户之前完成
改变主意，而线程是走加工，我想关闭干净）

I call obackgroundworker.CancelAsync(); on a background worker currently doing some work in another thread and then using while (obackgroundworker.IsBusy == true) to wait for it to finish before quitting the application (in case the user changes their mind while the thread is away processing and I want to close down cleanly)

平注销未决正确设置为true，但线程不退出，在辅助线程我有：

The flat for cancellation pending is set to true correctly but the thread doesn't quit, in the worker thread i have:

backgroundworker obackgroundworker = (backgroundworker)sender;
if (obackgroundworker.cancellationpending == true)
     e.cancel = true;

这应该检查是否取消是悬而未决，然后设置取消标志设置为true，和我觉得还导致线程终止居然...？或者是有一些其他的功能，我需要当它检测到取消实际结束从线程中调用？

which should check to see if a cancellation is pending and then set the cancelled flag to true, and i think that also causes the thread to actually terminate...? or is there some other function I need to call from the thread when it detects a cancellation to actually end?

我已经读了很多这正是使用后台工作人员的例子。像上面并没有报告任何问题。

I've read a lot of examples that use background workers exactly like above and don't report any problems.

来源：

的 http://www.albahari.com/threading/part3.aspx
的 http://www.dotneat.net/2009/02/10/BackgroundworkerExample.aspx
http://www.codeproject.com/KB/cpp/BackgroundWorker%5FThreads.aspx

感谢

推荐答案

设置 e.Cancel 来真不停止的执行的BackgroundWorker ，它只是表明该操作被取消，这样你可以检查它在 RunWorkerCompleted 事件。你需要从的DoWork 事件处理程序返回停止任务：

Setting e.Cancel to true doesn't stop the execution of the BackgroundWorker, it only indicates that the operation was canceled so that you can check it in the RunWorkerCompleted event. You need to stop the task by returning from the DoWork event handler :

BackgroundWorker obackgroundworker = (BackgroundWorker)sender;
if (obackgroundworker.CancellationPending == true)
{
     e.Cancel = true;
     return;
}

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