Question

在Form1顶部，我添加了这个：

bool completed;
AutoResetEvent autoreset;

在构造函数中我做了：

completed = false;
autoreset = new AutoResetEvent(false);

在我做过的背景工作者DoWork活动中：

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            while (true)
            {
                completed = true;
                if ((worker.CancellationPending == true))
                {
                    e.Cancel = true;
                    break;
                }
                else
                {
                    if (tempCpuValue >= (float?)nud1.Value || tempGpuValue >= (float?)nud1.Value)
                    {
                        soundPlay = true;
                        NudgeMe();
                    }
                    else
                    {
                        soundPlay = false;
                        stop_alarm = true;

                    }

                    tempCpuValue = Core.cpuView(pauseContinueDoWork,cpu,this,data,tempCpuValue,button1);
                    tempGpuValue = Core.gpuView(pauseContinueDoWork,data,tempGpuValue,button1);
                    this.Invoke(new Action(() => data = new List<string>()));
                    tempCpuValue = Core.cpuView(pauseContinueDoWork, cpu, this, data, tempCpuValue, button1);
                    tempGpuValue = Core.gpuView(pauseContinueDoWork, data, tempGpuValue, button1);
                    this.Invoke(new Action(() => listBox1.DataSource = null));
                    this.Invoke(new Action(() => listBox1.DataSource = data));



                    //listBox1.DataSource = data;

                }
            }
            autoreset.Set();
        }

然后在Form1结束活动中我做了：

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (MessageBox.Show("Are you Sure you want to Exit. Click Yes to Confirm and No to continue", "WinForm", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
            {
                e.Cancel = true;
            }
            else
            {
                if (completed == true)
                {
                    this.backgroundWorker1.CancelAsync();
                    autoreset.WaitOne();
                }
            }


        }

当它正在执行WaitOne（）时，表单刚刚显示在中间并且程序冻结我可以做的就是在visual studio Debug＆gt; Stop Debugging

我想这样做是为了aovid例外我有时会得到一些关于多线程的RaceOnRCWCleanup。

有时当关闭程序时，我遇到了另一个类这个例外：

System.ObjectDisposedException was unhandled by user code
  HResult=-2146232798
  Message=Cannot access a disposed object.
Object name: 'Form1'.
  Source=System.Windows.Forms
  ObjectName=Form1
  StackTrace:
       at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
       at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
       at System.Windows.Forms.Control.Invoke(Delegate method)
       at HardwareMonitoring.Core.cpuView(Boolean pause, CpuTemperature cpuTemp, Form1 f1, List`1 myData, Nullable`1 myCpuTemp, Button b1) in d:\C-Sharp\HardwareMonitoring\HardwareMonitoring\Hardwaremonitoring\Core.cs:line 55
       at HardwareMonitoring.Form1.backgroundWorker1_DoWork(Object sender, DoWorkEventArgs e) in d:\C-Sharp\HardwareMonitoring\HardwareMonitoring\Hardwaremonitoring\Form1.cs:line 427
       at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
       at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
  InnerException:

就像在backgroundworker完成作业之前处理的form1一样，backgrounddworker dowork事件正在使用这个类方法。

Answer 1

假设Bgw首先是你的背景工作者，你将设置：

Bgw.WorkerSupportsCancellation = true;

然后在你的DoWork委托中你必须检查Bgw.CancellationPending是真还是假。

如果确实这意味着背景工作者已被取消，那么如果不能继续，则必须中止该功能。

Answer 2

试试这个：

void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    while (!backgroundWorker1.CancellationPending)
    {
        if (tempCpuValue >= (float?)nud1.Value || tempGpuValue >= (float?)nud1.Value)
        {
            soundPlay = true;
            NudgeMe();
        }
        else
        {
            soundPlay = false;
            stop_alarm = true;

        }

        tempCpuValue = Core.cpuView(pauseContinueDoWork, cpu, this, data, tempCpuValue, button1);
        tempGpuValue = Core.gpuView(pauseContinueDoWork, data, tempGpuValue, button1);
        this.BeginInvoke(new Action(() => data = new List<string>()));
        tempCpuValue = Core.cpuView(pauseContinueDoWork, cpu, this, data, tempCpuValue, button1);
        tempGpuValue = Core.gpuView(pauseContinueDoWork, data, tempGpuValue, button1);
        this.BeginInvoke(new Action(() => listBox1.DataSource = null));
        this.BeginInvoke(new Action(() => listBox1.DataSource = data));
    }

    completed = true;

    autoreset.Set();
}

void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    if (MessageBox.Show("Are you Sure you want to Exit. Click Yes to Confirm and No to continue", "WinForm", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
    {
        e.Cancel = true;
    }
    else
    {
        if (!completed)
        {
            this.backgroundWorker1.CancelAsync();
            Hide(); // hide the form while waiting for the bw to terminate
            autoreset.WaitOne();
        }
    }
}

我已将来自Invoke的来电更改为BeginInvoke，这可以缓解您的问题。

如何在Form的Closing事件上停止BackgroundWorker以避免RaceOnRCWCleanup错误并在backgroundworker完成之前避免使用form1 dispose？

2 个答案: