.NET 给图片添加水印的方法代码

  

  private void Btn_Upload_Click(object sender, System.EventArgs e)

        {

            if(UploadFile.PostedFile.FileName.Trim()!="")

            {

                //上传文件

                string extension = Path.GetExtension(UploadFile.PostedFile.FileName).ToUpper();

                string fileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + 

DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + 

DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString();

                string path = Server.MapPath(".") + "/UploadFile/" + fileName + extension;

                UploadFile.PostedFile.SaveAs(path);

                //加文字水印，注意，这里的代码和以下加图片水印的代码不能共存

                System.Drawing.Image image = System.Drawing.Image.FromFile(path);

                Graphics g = Graphics.FromImage(image);

                g.DrawImage(image, 0, 0, image.Width, image.Height);

                Font f = new Font("Verdana", 32);

                Brush b = new SolidBrush(Color.White);

                string addText = AddText.Value.Trim();

                g.DrawString(addText, f, b, 10, 10);

                g.Dispose();

                //加图片水印

                System.Drawing.Image image = System.Drawing.Image.FromFile(path);

                System.Drawing.Image copyImage = 

System.Drawing.Image.FromFile( Server.MapPath(".") + "/Alex.gif");

                Graphics g = Graphics.FromImage(image);

                g.DrawImage(copyImage, new Rectangle(image.Width-copyImage.Width,