C# - BitmapImage zu einem Bitmap konvertieren

public static Bitmap ConvertBitmapImageToBitmap(BitmapImage bmpImg)
        {
            if (bmpImg == null)
                return null;

            using (MemoryStream outStream = new MemoryStream())
            {
                BitmapEncoder enc = new BmpBitmapEncoder();
                enc.Frames.Add(BitmapFrame.Create(bmpImg));
                enc.Save(outStream);
                return new System.Drawing.Bitmap(outStream);
            }
        }