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我有一个用于播放音频的 UWP 桌面应用程序。用户可以从包含几十个其他文件的列表中选择要播放的文件。这个列表被定义为一个 MediaPlaybackItem 列表，当做出选择时，我将 MediaPlayerElement 的 Source 属性设置为从列表中选择的 MediaPlaybackItem。问题是如果用户单击 NextTrack 或 PreviousTrack 按钮，事件不会触发。我尝试使用 MediaPlaybackList 作为 MediaPlayerElement 的源并解决了按钮问题，但是使用这种方法我无法从列表中选择任何文件。我无法设置 MediaPlayerElement 轨道。任何帮助都是最受欢迎的。谢谢。

<MediaPlayerElement x:Name="mediaPlayerElement" 
                                AutoPlay="False" 
                                HorizontalAlignment="Center" VerticalAlignment="Top"
                                Margin="0,0,0,100"
                                AreTransportControlsEnabled="True" >
                                <MediaPlayerElement.TransportControls>
                                    <MediaTransportControls 
                                             IsSkipBackwardEnabled="False"
                                             IsSkipBackwardButtonVisible="False"
                                             IsSkipForwardEnabled="False"
                                             IsSkipForwardButtonVisible="False"
                                             IsFastForwardButtonVisible="True"
                                             IsFastForwardEnabled="True"
                                             IsFastRewindButtonVisible="True"
                                             IsFastRewindEnabled="True" 
                                            IsFullWindowButtonVisible="False"
                                            IsNextTrackButtonVisible="True"
                                            IsPreviousTrackButtonVisible="True"
                                            IsZoomButtonVisible="False"/>
                                </MediaPlayerElement.TransportControls>
                            </MediaPlayerElement>

MediaPlaybackList mediaPlaybackList = new MediaPlaybackList();
List<MediaPlaybackItem> mediaPlaybackItems = new List<MediaPlaybackItem>();

mediaPlayerElement.MediaPlayer.SystemMediaTransportControls.ButtonPressed += SystemMediaTransportControls_ButtonPressed;

 private async void SystemMediaTransportControls_ButtonPressed(SystemMediaTransportControls sender, SystemMediaTransportControlsButtonPressedEventArgs args)
    {
        switch (args.Button)
        {
            case SystemMediaTransportControlsButton.Play:
                await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                    () =>
                    {
                        
                    });
                break;
            case SystemMediaTransportControlsButton.Pause:
                await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                    () =>
                    {
                       
                    });
                break;
            case SystemMediaTransportControlsButton.Previous:
                await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                    () =>
                    {
                        //This event is not fired when the MediaPlayerElement source is a MediaPlaybackItem. 
                    });
                break;
            case SystemMediaTransportControlsButton.Next:
                await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                    () =>
                    {
                        //This event is not fired when the MediaPlayerElement source is a MediaPlaybackItem. 
                    });
                break;
            case SystemMediaTransportControlsButton.Stop:
                break;
            default:
                break;
        }
    }
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