AppManifest.xml not getting updated by SL build

I'm starting an SL project in VS2010, and I'm finding that the AppManifest.xml file isn't being updated by the build. This causes the xap to fail to load in the browser, throwing an InitializationException. Doesn't VS maintain this file for you?

I noted that the Build Action listed for the AppManifest.xml file is currently "None", but I'm not sure what I should cha开发者_JS百科nge that to, if anything.

The problem turned out to be that I didn't have any Application class in my project, nor the required App.xaml. (I had somehow deleted these files when attempting to customize the solution.) This caused the xap to fail to load, and the error message led me to believe that the root cause was the AppManifest.xml, which generates the AppManifest.xaml file.

This was a mistake. Fixing the Application class and the App.xaml solved the problem.