Question

I have several issues with playing music in a Silverlight+XNA combined application. It has several Silverlight pages and the “game” page rendered in XNA.

First, I added the following code to the OnNavigatedTo event of the main Silverlight page:

var song = (Application.Current as App).Content.Load<Song>("Music/Menu");
MediaPlayer.Play(song);
MediaPlayer.Volume = 0.9f;
MediaPlayer.IsRepeating = true;

The music starts playing, however the application fails with the following exception that has no evident callstack hints:

InvalidOperationException occured
FrameworkDispatcher.Update has not been called. Regular FrameworkDispatcher.Update calls are necessary for fire and forget sound effects and framework events to function correctly.

Secondly, I have a few Silverlight-based windows rendered using UIElementRenderer. When the need arises, I change the control’s IsEnabled flag to true and start drawing it on the screen. This makes the music stop playing with a fadeout for no apparent reason and it wouldn’t even start back when I close the Silverligh window.

Navigating from the frame and back to it makes things even worse. The same call to MediaPlayer.Play(song) says that the song has been disposed, even though I load it from the ContentManager anew.

Answer 1

Please see this StackOverflow question — answer is pretty clear. In short, you have to call FrameworkDispatcher.Update() before using XNA media libraries.