在后台工作暂停/继续循环 [英] Pause/Resume loop in Background worker

问题描述

我在后台工作在WinForm应用程序的循环。

I have a loop in Background worker in a Winform Application.

我只是用这个 code 但不会暂停后重新开始。

I Just used this Code but it won't resume after the Pause.

在我使用这个主类

System.Threading.ManualResetEvent _busy =新System.Threading.ManualResetEvent（假）;

然后在我开始单击我写这样的：

Then in My Start Click I wrote this:

      if (!backgroundWorker1.IsBusy)
            {
                MessageBox.Show("Not Busy"); //Just For Debugg
                _busy.Set();
                Start_Back.Text = "Pause";
                backgroundWorker1.RunWorkerAsync(tempCicle);   
            }
            else
            {
                _busy.Reset();
                Start_Back.Text = "Resume";
            }

            btnStop.Enabled = true;

然后在BackgroundWorker的的doWork我写这个：

Then in backgroundworker doWork I wrote this:

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
     m_addTab addTabsInvoke = addTabUrl2;
      Invoke(addTabsInvoke, "http://www.google.com");
        foreach (something)
                {
                    _busy.WaitOne();

                    if (backgroundWorker1.CancellationPending)
                    {
                        return;
                    }
                    if (tabs.InvokeRequired)
                        {
    ......
    ......

我不明白为什么暂停工作，同时恢复不起作用。难道我错了什么东西？

I can't understand why pause works while resume doesn't work. Did I wrong something?

推荐答案

我所能为你想要的猜测：

My best guess for what you want:

void ResumeWorker() {
     // Start the worker if it isn't running
     if (!backgroundWorker1.IsBusy) backgroundWorker1.RunWorkerAsync(tempCicle);  
     // Unblock the worker 
     _busy.Set();
}

void PauseWorker() {
    // Block the worker
    _busy.Reset();
}

void CancelWorker() {
    if (backgroundWorker1.IsBusy) {
        // Set CancellationPending property to true
        backgroundWorker1.CancelAsync();
        // Unblock worker so it can see that
        _busy.Set();
    }
}

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