wpf \silverlight 保存控件为图片

wpf:

private void SaveToImage(FrameworkElement ui, string fileName)
{
System.IO.FileStream fs

{
System.IO.FileStream fs = new System.IO.FileStream(fileName, System.IO.FileMode.Create);
RenderTargetBitmap bmp = new RenderTargetBitmap((int)ui.Width, (int)ui.Height, 96d, 96d, PixelFormats.Pbgra32);
bmp.Render(ui);
BitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bmp));
encoder.Save(fs);
fs.Close();

}

silverlight:

WriteableBitmap bitmap = new WriteableBitmap(控件名称, null);