UWP MediaPlayer停止播放声音

Question

我正在使用MediaPlayer类（https://docs.microsoft.com/en-us/windows/uwp/controls-and-patterns/media-playback）在我的UWP项目中播放声音。这一切都在开始时工作正常但突然Play（）调用开始“播放”声音（例如PlaybackSession的状态为“正在播放”）但没有声音输出......

 Dictionary<string, MediaPlayer> Effects = new Dictionary<string, MediaPlayer>();

 public async Task LoadEffects()
    {
        Effects?.Clear();
        StorageFolder folder = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFolderAsync("sounds");
        foreach (var effect in await folder.GetFilesAsync())
        {
            MediaPlayer snd = new MediaPlayer();
            snd.AutoPlay = false;
            snd.Source = MediaSource.CreateFromStorageFile(effect);
            snd.RealTimePlayback = true;
            snd.AudioCategory = MediaPlayerAudioCategory.GameMedia;
            Effects.Add(effect.DisplayName, snd);
        }
        IsLoaded = true;
    }
 public void StartPlaying(string name, float volume = 1.0f, bool force = false)
    {
      lock (_instance)
        {
            if (Effects.ContainsKey(name))
            {
                   //if force is true, force the sound to stop and play again otherwise just exit
                    if (Effects[name].PlaybackSession.PlaybackState == MediaPlaybackState.Playing && !force)
                    {
                        return;
                    }
                    Effects[name].Pause();
                    Task.Delay(100).ContinueWith((res) =>
                    {
                        Effects[name].Volume = volume;
                        Effects[name].PlaybackSession.Position = TimeSpan.Zero;
                        Effects[name].IsLoopingEnabled = true;
                        Effects[name].Play();
                    });
            }
        }
}

public void StopPlaying(string name)
    {
        lock (_instance)
        {
            try
            {
               //if nothing is playing just return
                if (Effects[name].PlaybackSession.PlaybackState != MediaPlaybackState.Playing) return;
            }
            catch(Exception ex)
            {
                //weird error happens sometimes, catch it and just return
                return;
            }
            if (Effects.ContainsKey(name))
            {
                Debug.WriteLine($"Stopping {name} now; state before: {Effects[name].PlaybackSession.PlaybackState.ToString()}");
                Effects[name].IsLoopingEnabled = false;
                Effects[name].Pause();

                Effects[name].PlaybackSession.Position = TimeSpan.Zero;
            }
        }
    }

我注意到，当我没有使用Task.Delay（）时，它似乎更频繁地发生。 使用了锁，因为我有一个单例类。