ASP.NET添加水印代码示例

   public bool IsReusable
        {
            get { return false; }
        }
        String markPath = "~/Images/WaterMark.jpg";//水印图片

        String defaultPath = "~/Images/default.jpg";//默认没有显示的图片

        public void ProcessRequest(HttpContext context)
        {
            Image conver = null;

            if (File.Exists(context.Request.PhysicalPath))
            {
            
                conver = Image.FromFile(context.Request.PhysicalPath); //将原始显示的图片放入到Image对象

                Image wateMark = Image.FromFile(context.Server.MapPath(markPath));//将水印放入到Image对象

                Graphics g = Graphics.FromImage(conver);

                g.DrawImage(wateMark,new Rectangle(conver.Width-wateMark.Width,conver.Height-wateMark.Height,wateMark.Width,wateMark.Height),0,0,wateMark.Width,wateMark.Height,GraphicsUnit.Pixel);

                g.Dispose();//释放Gradohics资源

                wateMark.Dispose();//释放水印对象
            }
            else
            {
                conver = Image.FromFile(context.Server.MapPath(defaultPath));
            }

            context.Response.ContentType = "image/jpeg";

            conver.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

            conver.Dispose();

            context.Response.End();
        }