C# .NET中 使用GDI+ 添加图形水印

 ///OriginalImage 需要添加水印的原始图像
 ///WaterMarkImage 目标水印图像
 ///Loction 水印图像相对于原始图像的起点坐标位置
private static Image ImageAppendWaterMark(this Image OriginalImage, Image WaterMarkImage, Point Loction) {

        Graphics g = Graphics.FromImage(OriginalImage);
        g.InterpolationMode = InterpolationMode.NearestNeighbor;
        g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Half;
        g.DrawImage(WaterMarkImage, new Rectangle(Loction,WaterMarkImage.Size), 0, 0, 
		WaterMarkImage.Width, WaterMarkImage.Height, GraphicsUnit.Pixel);
         g.Dispose();          
         return OriginalImage;
}