Windows Phone 8 show MessageBox when app closing (deactivated)

Question

I am trying to show user MessageBox just before app is closed (or deactivated). So I added this to both events:

if (AppSettings.ShouldShowAlertTransfer)
                {
                    MessageBox.Show("...");
                }

But the MessageBox is not shown. I am adding this because then I am adding background transfers and I must inform user that I created some background trasnfers. I know I can add this code to OnKeyBackPressed in every page. But it's working just for back key and not middle button. And it wouldn't be nice to have same code copied in every page.

So is it possible to show this MessageBox in App.xaml.cs? How can I do that? If it's not how can I show MessageBox when user pressed middle button?

Same? http://stackoverflow.com/questions/13419884/messagebox-show-in-app-closing-deactivated-events — crea7or, Jan 31 '14 at 17:37
I found it. It's similar but there is no right answer. As I said I am looking for solution without using OnBackKeyPress event. — Libor Zapletal, Jan 31 '14 at 17:39
My assumption would be that putting a block between the middle (home) button and its intended action is breaking policy. I for one would find it quite annoying to have a message box block my intended action when pressing the home key. — philorube, Jan 31 '14 at 17:42
I don't want to block. I just want to inform user that I am creating background transfers when he leaves app. You think it's still breaking policy? — Libor Zapletal, Jan 31 '14 at 17:44
Subway Surfers shows message box as the exit and this game is certified in wp store. So, use it if you really need it. — crea7or, Jan 31 '14 at 17:54
I think there will be a problem, because you have limited time when App is Closed/Deactivated - so MessageBox isn't suitable here. So better would be to inform user just before Exiting, before Deactivation is called. — Romasz, Jan 31 '14 at 19:28
@crea7or Is the message box shown when the home key is pressed, or when the app is exited using the back key? — philorube, Jan 31 '14 at 20:54

score 1 · Accepted Answer · answered Feb 01 '14 at 02:26

I was intrigued by your question so I opened up a solution and attempted every single override available and every single page event. I also tried all of the methods in the App.xaml.cs.

I can unequivocally say, based on the MSDN documentation and my own personal testing that there is no way to detect the home button press or search button press. Furthermore there is no way to display a message box to temporarily stop one of these actions.

This testing was done on Windows Phone 8 with the WVGA 512MB Emulator in Visual Studio 2013 Ultimate.

Windows Phone 8 show MessageBox when app closing (deactivated)

1 Answers1