silverlight: 如何擷取流媒體的第一幀

       

    <StackPanel Width="600">
        <MediaElement x:Name="ME" MouseLeftButtonDown="ME_MouseLeftButtonDown"/>
        <telerik:RadWrapPanel x:Name="ThumbnailsPanel"/>
    </StackPanel>

 

        private void ME_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            WriteableBitmap bitmap = new WriteableBitmap(ME, new TranslateTransform());
            Image img = new Image();
            img.Width = 140;
            img.Margin = new Thickness(5);
            img.Source = bitmap;
            this.ThumbnailsPanel.Children.Add(img);
        }