In WPF, the button is clicked multiple times to trigger the click solution. wpfclick

In WPF, the button is clicked multiple times to trigger the click solution. wpfclick

In WPF, you can click the button multiple times to trigger a click. The details are as follows:

  DateTime lastClick = DateTime.Now;  object obj = new object();  int i = 0;  private void Button_Click(object sender, RoutedEventArgs e)  {   this.IsEnabled = false;     var t = (DateTime.Now - lastClick).TotalMilliseconds;   i++;   lastClick = DateTime.Now;   System.Diagnostics.Debug.Print(t + "," + i + ";" + DateTime.Now);   Thread.Sleep(2000);      this.IsEnabled = true;  }

The above Code does not solve the problem that the user clicks the button twice to trigger twice. Because the ui thread is single-threaded, this will cause the user to click twice in a row, it will call Button_Click again two seconds later. The output is as follows:

1207.069, 1; April 19, 2017 13:58:22
2055.1176, 2; April 19, 2017 13:58:24

Therefore, force the interface to refresh after this. IsEnabled = false; the Code is as follows:

private void Button_Click(object sender, RoutedEventArgs e)  {   this.IsEnabled = false;   DispatcherHelper.DoEvents();   var t = (DateTime.Now - lastClick).TotalMilliseconds;   i++;   lastClick = DateTime.Now;   System.Diagnostics.Debug.Print(t + "," + i + ";" + DateTime.Now);   Thread.Sleep(2000);      this.IsEnabled = true;  }  public static class DispatcherHelper  {   [SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)]   public static void DoEvents()   {    DispatcherFrame frame = new DispatcherFrame();    Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Background, new DispatcherOperationCallback(ExitFrames), frame);    try { Dispatcher.PushFrame(frame); }    catch (InvalidOperationException) { }   }   private static object ExitFrames(object frame)   {    ((DispatcherFrame)frame).Continue = false;    return null;   }  }

DispatcherHelper. DoEvents (); this method forces the interface to be refreshed and the problem is solved.

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