在ASP.NET中生成wpfuielement的位图

public static byte[] Draw(int width, int height)
    {
        MemoryStream memoryStream
            = new MemoryStream();
        Thread t = new Thread(delegate()
            {
                System.Windows.Controls.Border border = new System.Windows.Controls.Border()
                {
                    Background = Brushes.Red,
                    BorderBrush = Brushes.Green,
                    CornerRadius = new System.Windows.CornerRadius(5),
                    Width = width,
                    Height = height
                };

                border.ApplyTemplate();

                RenderTargetBitmap renderTargetBitmap = 
                    new RenderTargetBitmap(width, height, 90, 90, PixelFormats.Pbgra32);

                renderTargetBitmap.Render(border);

                BitmapEncoder bitmapEncoder = 
                    new PngBitmapEncoder();

                bitmapEncoder.Frames.Add(BitmapFrame.Create(renderTargetBitmap));
                bitmapEncoder.Save(memoryStream);
            });
        t.SetApartmentState(ApartmentState.STA);
        t.Start();
        bool success = t.Join(5000);

        if (success)
            return memoryStream.ToArray();
        else
            throw new Exception("Fail");
    }

结果是非常糟糕的,正如我所说的那样,这个东西返回的图像具有正确的宽度和高度,但是它是空的,所以我想我不会用线程位来搞乱这个东西。