Windows phone 8.1 Handling App from Close button in the page

Question

In my windows phone app, i have to delete some files when user navigates away from a page. I have handled this on OnBackKeyPress event. This works perfectly fine. The issue is newer updates of windows phone 8 and windows phone 8.1 also have close button on the top right corner. I have not found a way to handle this event. Could anyone please let me know how can i handle this event and delete the files.

Answer 1

Rather than using OnBackKeyPress, you should use OnNavigatedFrom. This event is triggered whenever the user leaves the page, no matter how.

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If you need to handle only the specific case when the app is suspended/terminated, you can subscribe to the Deactivated and Closing events on the PhoneApplicationService.

PhoneApplicationService.Current.Deactivated += yourHandler;

Note that is the your event handler is a non-static method declared in your page, then you must make sure to unsubscribe the event when leaving the page, to avoid a memory leak. To know when to unsubscribe, you can stick to your OnBackKeyPress logic.