Question

我尝试将视频标题放在这些代码的MediaPlayerElement的TransportControl上

MediaTransportControlsStyle.xaml

...
 <TextBlock
    Name="tblTitle"
    Grid.Column="1"
    Margin="5"
    FontFamily="Arial"
    FontSize="22"
    FontWeight="SemiBold"
    TextAlignment="Center" />
...

PlayerPage.xaml.cs

private async void MediaPlayer_MediaOpened(MediaPlayer sender, object args)
{
    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
    {
        FrameworkElement transportControlsTemplateRoot = (FrameworkElement)VisualTreeHelper.GetChild(player.TransportControls, 0);
        TextBlock tblTitle = (TextBlock)transportControlsTemplateRoot.FindName("tblTitle");
        if (tblTitle != null)
            tblTitle.Text = MediaTitle; // Debug can run to this line
    });
}

问题是 tblTitle ，只是在首次应用程序更新时导航到 PlayerPage.xam l页面。从第二次 tblTitle 开始，即使调试运行到该行，也保持空白

tblTitle.Text = MediaTitle; // Debug can run to this line

我想我与Dispatcher.RunAsync方法有关，以更新UI线程。我尝试了几种方法，但是没有运气。我该如何解决这个问题？

Answer 1

我发现转到PlayerPage时没有重新初始化MediaPlayer。每次都只需初始化就可以完成

文本无法从MediaPlayerElement（UWP）更新onTransportControl

1 个答案: