[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Occurs when an app begins to run in the background.
Assembly: Microsoft.Phone (in Microsoft.Phone.dll)
XMLNS for XAML: Not mapped to an xmlns.
A location-aware app can request to run in the background while it is actively tracking the phone’s location. For more information, see How to run location-tracking apps in the background for Windows Phone 8.