文本未从 MediaPlayerElement (UWP) 更新 onTransportControl

Question

我尝试像这些代码一样将视频标题放在 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 只是更新第一次应用程序导航到 PlayerPage.xaml 页面。从第二次开始 tblTitle 即使在调试运行行

时也保持空白

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

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

Answer 1

我发现我在进入PlayerPage时没有重新初始化MediaPlayer。只需每次初始化即可完成

文本未从 MediaPlayerElement (UWP) 更新 onTransportControl

Text not update onTransportControl from MediaPlayerElement (UWP)

c#

xaml

uwp

win-universal-app

windows-10-universal