在等待同一行代码时，在主线程webBrowser_DocumentCompleted中保持UI响应

Question

I want to wait some time in webBrowser1_DocumentCompleted Event. The reason is so that Webbrowser Document stream is well downloaded when next document is completed. I don't want to block the UI when i am waiting and i don't want upcomming Document_Completed_Events to be fired.

 private void FormTimer()
    {
        webBrowser1.Navigate("http://www.rolex.com/");
        webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
    }
    void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        DownloadCount++;
        alarmCounter = 0;
        Task abc = new Task(() =>
        {
            while (alarmCounter < 5)
            {
                Thread.Yield();
            }
        });
        abc.Start();
        Task.WaitAny(abc);
    }

    void timer_Tick(object sender, EventArgs e)
    {
        alarmCounter++;
    }

The problem is that tick stops as it goes in DocumentCompletedEvent.Kindly help me understand the problem as well as a good approach to deal with these soughts of situations.

Update: This technique works ,by detaching the expected unwanted events and go for DoEvents() It will also keep the UI responsive as well as timer tick.

    void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        richTextBox1.Text += "\nDocument Started" + documentCount;
        alarmCounter = 0;
        timer.Enabled = true;
        //Do some work
        webBrowser1.DocumentCompleted -= webBrowser1_DocumentCompleted;
        while (alarmCounter < 3)
        {
            Application.DoEvents();            
        }
        webBrowser1.DocumentCompleted += webBrowser1_DocumentCompleted;             
        richTextBox1.Text += "\nDocument Completed." + documentCount;
    }

Answer 1

Are you use Windows.Forms.Timer? You should know, what Windows.Forms.Timer executes in same thread with UI. So then you call Task.WaitAny you block thread and your timer stop worked.