this.backgroundWorker1.CancelAsync()没效果。。。。

Question

this.backgroundWorker1.CancelAsync()没效果。不知道为啥，运行了上面的了。backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
一直还在运行

Answer 1

调用this.backgroundWorker1.CancelAsync()并不能结束后台线程，
要想提前结束这个线程，需要在你的DoWork事件事件处理函数中进行处理，示例代码如下：
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) 
        { 
            for (int i = 0; i < 10; i++ ) 
            { 
                if ((BackgroundWorker)sender.CancellationPending) 
                { 
                    e.Cancel = true;                    
                    break; 
                } 
                //dosomething.....
            } 
        }private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Cancelled)
            {
                //Cancelled 
            }
            else
            {
                //Succeed
            }        }

Answer 2

如果你想结束的话要在DoWork事件里面写的

Answer 3

看看这个吧：
http://www.cnblogs.com/lexus/archive/2008/08/27/1277956.html