MediaElement in Windows UWP應用程序未播放音頻

Question

 MediaElement player = new MediaElement(); 
     player.Source = new Uri("ms-appx:///Assets/Media/backgroundtrack.mp3"); 
     player.Volume = 100; 
     player.Play(); 

此代碼有什麼問題？當我運行我的程序時，沒有聲音。

Answer 1

var folder = await StorageFolder.GetFolderFromPathAsync("ms-appx:///Assets/Media"); 
if(folder != null) 
{ 
    var file = await folder.GetFileAsync("backgroundtrack.mp3"); 
    if(file != null) 
    { 
     var stream = await file.OpenReadAsync(); 
     mediaElement.SetSource(stream, file.ContentType); 
     player.Volume = 100; 
     player.Play(); 
    } 
}