How can you tell when a windows 8 Metro app gets put in the background? The suspended state doesn't activate. I have a break point on. It only hits if I close the app.
I am using a webcam and since no apps can run in the background I need to save my work when it's put in the background.
The windows phone it was application deactivated.
any help would be nice.
Apps do not normally get suspended when in the debugger. However, you can force a suspend when debugging by:
- Enabling the Debug Location toolbar (red arrow in image below).
- Then press the Suspend button (blue arrow).
The suspending event should fire when the application is no longer active, namely, when another application is brought to the front. Presuming you're using C#/XAML, the app.xaml.cs file already has the Suspending event wired up. In HTML5/JavaScript it's checkpoint and you'll see it in default.js.
来源：https://stackoverflow.com/questions/14076188/windows-8-winrt-application-goes-to-background-or-close