C# winforms backgroundworker thread-sleep

如何取消带有睡眠的后台工作者？

发布于 2024-12-10 00:11:23 字数 856 浏览 3 评论 0原文

我无法取消其中包含 Thread.Sleep(100) 的后台工作线程。

private void backgroundWorker1_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
        int count;
        try
        {
            count = int.Parse(textBox3.Text);

            for (int i = 0; i < count; i++)
            {
                backgroundWorker1.ReportProgress((int)(((double)(i + 1) / count) * 1000));
                //Computation code
                Thread.Sleep(int.Parse(textBox4.Text));
            }
        }
        catch (Exception ex)
        {
            request.DownloadData(url);
            MessageBox.Show(ex.Message);
        }
}

private void cancel_Click(object sender, EventArgs e)
{
    backgroundWorker1.CancelAsync();
    progressBar1.Value = 0;
}

如果我删除 Thread.Sleep(100) ，那么取消会起作用，但否则它会继续进行（进度条不会停止）。

编辑：添加了其余代码

原文

I'm having trouble canceling a background worker that has a Thread.Sleep(100) in it.

private void backgroundWorker1_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
        int count;
        try
        {
            count = int.Parse(textBox3.Text);

            for (int i = 0; i < count; i++)
            {
                backgroundWorker1.ReportProgress((int)(((double)(i + 1) / count) * 1000));
                //Computation code
                Thread.Sleep(int.Parse(textBox4.Text));
            }
        }
        catch (Exception ex)
        {
            request.DownloadData(url);
            MessageBox.Show(ex.Message);
        }
}

private void cancel_Click(object sender, EventArgs e)
{
    backgroundWorker1.CancelAsync();
    progressBar1.Value = 0;
}

If I remove the Thread.Sleep(100) then the cancel works but otherwise it just keeps going (the progress bar doesn't stop).

EDIT: Added the rest of the code

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恰似旧人归 2024-12-17 00:11:23

当您调用 CancelAsync 时，它只是将名为 CancellationPending 的属性设置为 true。现在，您的后台工作人员可以而且应该定期检查此标志是否为真，以优雅地完成其操作。因此，您需要将后台任务分成几部分，您可以在其中检查取消情况。

private void DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
    {
        while(true)
        {
            if(worker.CancellationPending)
            {
                e.Cancel = true;
                return;
            }

            Thread.Sleep(100);
        }
    }

When you call CancelAsync it just sets a property called CancellationPending to true. Now your backgroundworker can, and should, periodically check if this flag is true, to gracefully finish its operation. So you need to split your background task into pieces where you can check for cancelation.

private void DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
    {
        while(true)
        {
            if(worker.CancellationPending)
            {
                e.Cancel = true;
                return;
            }

            Thread.Sleep(100);
        }
    }

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