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我在 StandardStyles.xaml 中有下一个代码：

    <Style  x:Key="RootFrameStyle" TargetType="Frame">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Frame">
                <Grid>
                    <MediaElement x:Name="MediaPlayer" AudioCategory="BackgroundCapableMedia" />
                    <ContentPresenter />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

在 App.Xaml.cs 中 OnLaunched 中的下一个代码：

...
rootFrame.Style = Resources["RootFrameStyle"] as Style;
...

在 MainPage.xaml.cs 代码中：

    PlayToManager playToManager = null;
        CoreDispatcher dispatcher = null;

        private void LayoutAwarePage_Loaded_1(object sender, RoutedEventArgs e)
        {
            if (App.Player == null)
            {
                var rootGrid = VisualTreeHelper.GetChild(Window.Current.Content, 0);
                App.Player = (MediaElement)VisualTreeHelper.GetChild(rootGrid, 0);
                App.Player.Source = new Uri("http://myserverlink.com/mymp3file.mp3");

                App.Player.Play();
            }
        }

protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            dispatcher = Window.Current.CoreWindow.Dispatcher;
            playToManager = PlayToManager.GetForCurrentView();
            playToManager.SourceRequested += playToManager_SourceRequested;
        }

        void playToManager_SourceRequested(PlayToManager sender, PlayToSourceRequestedEventArgs args)
        {
            var deferral = args.SourceRequest.GetDeferral();
            var handler = dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
                {
                    args.SourceRequest.SetSource(App.Player.PlayToSource);
                    deferral.Complete();
                });
        }

如果我在 Windows 8 中单击设备，则在 PlayTo 的设备列表中没有设备。如果要在 MainPage.xaml 中添加一个 MediaElement，则列表中的设备。但是我需要MediaElement 的Style File，导航到另一个页面没有停止播放音乐。该怎么办？

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