你可以关注  Window.SizeChanged  您可以从中识别应用程序的当前ViewState。请在此处查看示例
：  http://code.msdn.microsoft的.com / windowsapps /管理单元采样2ff037ae

I created a sub but it is not automatically activated when I move the app into a snapped state.  How should I change this:

You can watch for the Window.SizeChanged from which you can identify the application's present ViewState. Please take a look at the sample here: http://code.msdn.microsoft.com/windowsapps/Snap-sample-2ff037ae