这个需要引用dll的吧,private Windows.Media.PlayTo.PlayToManager ptm = 
        Windows.Media.PlayTo.PlayToManager.GetForCurrentView();protected override void OnNavigatedTo(NavigationEventArgs e)
{
    ptm.SourceRequested += sourceRequestHandler;
}private void sourceRequestHandler(
    Windows.Media.PlayTo.PlayToManager sender,
    Windows.Media.PlayTo.PlayToSourceRequestedEventArgs e)
{
    try
    {
        e.SourceRequest.SetSource(mediaElement.PlayToSource);
    }
    catch (Exception ex)
    {
        messageBlock.Text += "Exception encountered: " + ex.Message + "\n";
    }
}具体可以看看介个