Question

i’m building a wp7 application for a game using silverlight & XNA
i have an mp3 file called “Punch1.mp3” (Build action : resource ) stored inside a folder called “SoundEffects" inside the project folder

and i want to play the file using this code

         StreamResourceInfo info;

         Uri myuri = new Uri("/SoundEffects/Punch1.mp3", UriKind.Relative);
         info = App.GetResourceStream (myuri);
         punch1 = SoundEffect.FromStream(info.Stream ) ; 

punch is defined in the code here :

public static SoundEffect punch1;

the problem is that it raises a nullreference exception in the third line claiming that info is null
and that’s true in the debugging mode , i found that the resource stream info is null
i think this is because the it can’t read the file although the uri is correct

Answer 1

in the following code :

     Uri myuri = new Uri("/SoundEffects/Punch1.mp3", UriKind.Relative);
     info = App.GetResourceStream (myuri);
     punch1 = SoundEffect.FromStream(info.Stream ) ; 

SoundEffect.FromStream() expects a wave file stream not an MP3 as shown here : http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.audio.soundeffect.fromstream.aspx .
so solution to find a mp3 > wav convertor or just find another way to load mp3 to WP7

considering the picture this is normal URI in normal cases can’t evaluate expression of isfile .