asp.net MVC 图片水印和文字水印

 //type传入参数类型是图片水印还是文字水印
        public void addStrToImage(string type)
        {
            string path = System.Web.HttpContext.Current.Server.MapPath("/Images/") + "WarterImage.jpg";
            System.Drawing.Image image = System.Drawing.Image.FromFile(path);
            if (type == "文字")
            {
                //加文字水印.文字和图片水印如果共存请加判断
                Graphics g = Graphics.FromImage(image);
                g.DrawImage(image, 0, 0, image.Width, image.Height);
                Font f = new Font("Verdana", 32);//文字字体
                Brush b = new SolidBrush(Color.White);//文字颜色
                string addText = "123";//要加的文字
                g.DrawString(addText, f, b, 10, 10);
                g.Dispose();
            }
            else
            {
                ////加图片水印
                System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Server.MapPath(".") + "/pic.gif");
                Graphics g = Graphics.FromImage(image);
                g.DrawImage(copyImage, new Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
                g.Dispose();
            }
            //保存加水印过后的图片
            image.Save(path + "thum.JPG");
            image.Dispose();
        }