如何通过点击按钮调用媒体播放器播放列表中的默认歌曲？
MediaPlayerLauncher mediaPlayerLauncher = new MediaPlayerLauncher();
mediaPlayerLauncher.Media = new Uri("MyVideo.wmv", UriKind.Relative);
mediaPlayerLauncher.Location = MediaLocationType.Data;
mediaPlayerLauncher.Controls = MediaPlaybackControls.Pause | MediaPlaybackControls.Stop;
mediaPlayerLauncher.Orientation = MediaPlayerOrientation.Landscape;
mediaPlayerLauncher.Show();