问如何使用XNA将一系列图像从UI线程放入Silverlight5中的绘图线程

EN

    //Video sink capture
    // Is called every time the webcam provides a complete frame (Push)   
    protected override void OnSample(long sampleTime, long frameDuration, byte[] sampleData)
    {
        System.Windows.Deployment.Current.Dispatcher.BeginInvoke(() =>
        {
            WriteableBitmap bmp = new WriteableBitmap(vidFormat.PixelWidth, vidFormat.PixelHeight);
            RaiseFrameCapture(new FrameCapturedEventArgs { Frame = bmp.FromByteArray(sampleData) });
        });
    }

    //Capture from sink into WebCamController
    void sink_FrameCaptured(object sender, FrameCapturedEventArgs e)
    {

        //List<WriteableBitmap>
        _WebCamSource.AddImage(e.Frame.Clone());

    }


    //XNA draw event handler
    private void DrawingSurface_Draw(object sender, DrawEventArgs e)
    {
        List<WriteableBitmap> frames = new List<WriteableBitmap>();

        if (webCamSource.Frames.Count > 0)
        {
            Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
                frames = new List<WriteableBitmap>(webCamSource.Frames.ToArray());

            });
        }

        Draw(frames);

        e.InvalidateSurface();
    }