Question

我看着世界森林论坛的窗口,想做一些工作。

当这项工作完成时,我想再次做。

我的法典:

private void InitializeBackgroundWorker()
        {
            m_stopCamera = false;
            m_worker = new BackgroundWorker();
            m_worker.DoWork += new DoWorkEventHandler(worker_DoWork);
            m_worker.RunWorkerCompleted += new     RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
            m_worker.WorkerSupportsCancellation = true;
        }

unsafe void worker_DoWork(object sender, DoWorkEventArgs e)
{
  // my work....
  e.Result = new MyResultClass(p1,p2..);
}

private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Cancelled)
                return;


            if (e.Error != null)
            {
                Logger.LogException(e.Error.ToString());
                Window_Closed(this, new EventArgs());
            }
            try
            {

                //UI work..
                DetectionResult result = e.Result as DetectionResult;
                if (result.Cancel == true)
                {
                    m_DetectedObjID = result.DetectionID;
                    // PlaySound();
                    audio_MediaEnded(this, new EventArgs());
                }
                else
                     ((BackgroundWorker)sender).RunWorkerAsync();

            }
            catch (Exception ex)
            {

                Logger.LogException(ex.ToString());
                Window_Closed(this,new EventArgs());
            }

        }

我知道,这部法典是一个好的理由,即read子,可以适当地加以 de击。

for example.. when the code is running and i click the close button i can see in the event the the worker is busy all the time.. resulting an infinity loop..

 private void Window_Closed(object sender, EventArgs e)
        {

                if (m_worker.IsBusy)
                    m_worker.CancelAsync();

                while(m_worker.IsBusy);
                base.Close();
            }

        }

什么是错的? 增编

Answer 1

页: 1 这种方法中的“取消”法应着眼于:

if ((m_worker.CancellationPending == true))
{
   e.Cancel = true;
   return;
}

直到你收到<代码>。填满的手稿和你的休息室将停下来。

如果您认为,应当制定<条码>。你真的错了。这里是来自背景工作者CancelAsync(以下简称)的编造法:

public void CancelAsync()
{
  if (!this.WorkerSupportsCancellation)
    throw new InvalidOperationException(SR.GetString("BackgroundWorker_WorkerDoesntSupportCancellation"));
  this.cancellationPending = true;
}

各位可以看到,这只是打上了<条码>待决/代码>。因此,正如第一张刀上所示,你必须在<条码>上核对这一财产。

Answer 2

明确路线:

while(m_worker.IsBusy);//may be go to infinite loop

Answer 3

如果你想在这种背景下做一些事情,你可以这样做:

public void DoEvents()
{
    Application.Current.Dispatcher.Invoke(DispatcherPriority.Background, new Action(() =>
    {
        code;
        DoEvents();
    }));
}

该守则将在万国邮联获释时执行,因此不影响你主线的运行。

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