/// <summary>
 /// 初始化歌单列表
 /// </summary>
 private void InitPlayList()
 {
     PlayLists = new List <PlayListItemViewModel>();
     foreach (var item in PlayListService.GetAllPlayLists())
     {
         PlayListItemViewModel viewModel = new PlayListItemViewModel();
         viewModel.PlayList = item;
         PlayLists.Add(viewModel);
     }
 }
 /// <summary>
 /// 初始化音乐列表
 /// </summary>
 /// <param name="playList"></param>
 private void InitMusicList(PlayListItemViewModel playList)
 {
     MusicList           = new List <MusicItemViewModel>();
     playList.IsSelected = true;
     foreach (var item in PlayListService.GetMusicList(playList.PlayList))
     {
         MusicItemViewModel viewModel = new MusicItemViewModel();
         viewModel.Music = item;
         MusicList.Add(viewModel);
     }
 }