Question

我有一个按钮点击事件继续：

 private void button3_Click(object sender, EventArgs e)
        {
            if (backgroundWorker1.IsBusy)
            {
                button2.Enabled = true;
                button3.Enabled = false;
            }
            else
            {
                backgroundWorker1.RunWorkerAsync();
                button2.Enabled = true;
                button3.Enabled = false;
            }

        }

暂停按钮点击事件：

private void button2_Click(object sender, EventArgs e)
        {
            if (backgroundWorker1.WorkerSupportsCancellation == true)
            {
                backgroundWorker1.CancelAsync();
                button3.Enabled = true;
                soundPlay = false;
                stop_alarm = true;
            }

        }

问题在于button3点击事件，继续代码有时后台很忙，所以我可以启用false / true按钮，但后台工作人员继续工作。我想暂停DoWork事件并继续。

这是我的DoWork活动：

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            while (true)
            {
                if ((worker.CancellationPending == true))
                {
                    e.Cancel = true;
                    break;
                }
                else
                {
                    if (tempCpuValue >= (float?)numericUpDown1.Value || tempGpuValue >= (float?)numericUpDown1.Value)
                    {
                        soundPlay = true;
                        blinking_label();
                    }
                    else
                    {
                        soundPlay = false;
                    }
                    cpuView();
                    gpuView();
                    Thread.Sleep(1000);
                }
            }
        }

Answer 1

您可以使用Thread代替BackgroundWorker吗？

使用Thread，在其工作子例程中，您可以将线程置于捕获ThreadInterruptedException的try / catch块内的无限睡眠中。因此，当它循环遍历其正在处理的任何内容时，您可以查看布尔标志的值以了解是否要休眠，然后调用Thread.Sleep(Timeout.Infinite)。当您捕获ThreadInterruptedException时，将标志设置为false并继续执行。

要从您的UI恢复线程，您可以将'pause'标志设置为false并在您的线程上调用workerThread.Interrupt()（假设您将其称为workerThread，即）。

来自here

的想法

Answer 2

您可能需要等到取消完成后再启用/禁用按钮。

private AutoResetEvent _resetEvent = new AutoResetEvent(false);

private void button2_Click(object sender, EventArgs e)
        {
            if (backgroundWorker1.WorkerSupportsCancellation == true)
            {
                backgroundWorker1.CancelAsync();
                //Wait statement goes here.
                this.Cursor=Cursors.AppStarting;
                _resetEvent.WaitOne(); // will block until _resetEvent.Set() call made

                button3.Enabled = true;
                soundPlay = false;
                stop_alarm = true;
            }

        }

Please see this question:

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            while (true)
            {
                if ((worker.CancellationPending == true))
                {
                    e.Cancel = true;

                    break;
                }
                else
                {
                    if (tempCpuValue >= (float?)numericUpDown1.Value || tempGpuValue >= (float?)numericUpDown1.Value)
                    {
                        soundPlay = true;
                        blinking_label();
                    }
                    else
                    {
                        soundPlay = false;
                    }
                    cpuView();
                    gpuView();
                    Thread.Sleep(1000);
                }
            }

              _resetEvent.Set(); // signal that worker is done
        }

我如何暂停/继续后台工作？

2 个答案: