public static RenderTargetBitmap ToRenderTargetBitmap(this System.Windows.UIElement element, Size size, PixelFormat pixelFormat)
{
var result = new RenderTargetBitmap((int)size.Width, (int)size.Height, 96, 96, pixelFormat);
element.Measure(size);
element.Arrange(new System.Windows.Rect(size));
result.Render(element);
return(result);
}
public static void SaveImage(this System.Windows.UIElement element, Size size, PixelFormat pixelFormat, string fileName)
{
using (var stream = File.OpenWrite(fileName))
{
element.Measure(size);
element.Arrange(new System.Windows.Rect(size));
var renderTargetBitmap = element.ToRenderTargetBitmap(size, pixelFormat);
var encoder = GetEncoder(fileName);
encoder.Frames.Add(BitmapFrame.Create(renderTargetBitmap));
encoder.Save(stream);
}
}