Question

I recently submitted a small app working on Silverlight framework.
But my app got rejected from the marketplace due to error 5.2.3 i.e Application Responsiveness After Being Deactivated.
What I found was :
After a user successfully completes the game(a puzzle), I am showing him a dialog :

MessageBoxResult mr = MessageBox.Show("You have won! Do you want to start another game?", "Information", MessageBoxButton.OKCancel);
if(mr==MessageBoxResult.Cancel)
{
    NavigationService.GoBack();
}

Now the point is – If the user presses the start button after this dialog box is displayed, the app stops throwing an exception –
Navigation is not allowed when the task is not in the foreground. Error: -2147220990

It seems to me a valid error, though I am not sure how my other apps successfully passed the certification process though they had the same flaw. I have just started developing WP apps so I dont have much knowledge of things to do. Please could you help me a workaround.

Answer 1

It doesn’t look like there is an easy test for this case. It would appear that the MessageBox is cancelled before the Deactivated event is fired, so there is no way that I can see to test for this state.

My suggestion would be to detect and swallow the specific exception:

  MessageBoxResult mr = MessageBox.Show("You have won! Do you want to start another game?", "Information", MessageBoxButton.OKCancel);
  if (mr == MessageBoxResult.Cancel)
  {
    try
    {
      NavigationService.GoBack();
    }
    catch (InvalidOperationException e)
    {
      // occurs if message box closed due to de-activation
    }
  }