WPF保存控件为图片

private void SaveToImage(FrameworkElement ui, string fileName)
{

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();
}

调用：

SaveToImage(ListBox,“text.png”);