问题
How do we force an app to Suspend (NOT shutdown, just suspend) and then force-resume it ourselves when we are NOT using visual studio/debugging?
回答1:
When running under Visual Studio 2012, you can enable the Debug Location on the debugger toolbar. This will allow you to select one of the three operations, "suspend", "resume", and "suspend and shutdown".
[edited] Sorry, just noticed that you are asking for non VS solution. You can suspend your app by dragging the app down. Move your cursor to the top of the page until you see a hand. Click and hold it and pull down to suspend your app. It takes a few seconds before the app actually enter suspend mode. If you want to do things sooner, you can use visibility change to toggle certain action first, like saving critical stuff.
来源：https://stackoverflow.com/questions/17857660/how-do-i-force-suspension-of-metro-app