CODEWITHSUNDEEP
c#windows-runtimewindows-phone-8.1
Romasz
Romasz

Reputation: 29790

OnNavigatedFrom is not called when the app is suspended

Today I've encountered strange problem - seems that on my device (v. 8.10.14203.306) OnNavigatedFrom event is not getting called when the app is being suspended. As far as I remember some time ago it was working ok, and exacly as documentation stays:

Note On Windows Phone, OnNavigatedFrom() is called when the app is suspended. OnNavigatedTo() is not called when the app is resumed.

I've tried a simple example (available at GitHub):

protected override void OnNavigatedFrom(NavigationEventArgs e)
{
    this.navigationHelper.OnNavigatedFrom(e);
    Debug.WriteLine("Navigation");
    this.Background = new SolidColorBrush(Colors.Red);
}

when there is normal navigation (e.g. by back button) the event is fired, but no more when the app is suspended - both in debug and release mode. I've also checked if the Suspending event is fired and it turnes out that it is:

// uncomment this to check if app is being suspended
App.Current.Suspending += (sender, e) => this.Background = new SolidColorBrush(Colors.Blue);

Am I missing something?

Upvotes: 2

Views: 1212

Answers (1)

Decade Moon
Decade Moon

Reputation: 34306

The only thing I can suggest is to make sure that you're calling Frame.GetNavigationState from within your Application.Suspending handler (this is usually done by SuspensionManager.SaveAsync). According to the docs:

Calling this method will call Page.OnNavigatedFrom for the current page using NavigationMode.Forward. GetNavigationState is usually called when the application is being suspended, so the current page is navigated away from.

Upvotes: 4

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