asp.Net 一些常用的方法和类(11)

                Graphics g = Graphics.FromImage(img);//通过图片对象创建画布 
                g.DrawImage(watering, new Rectangle(img.Width - watering.Width, img.Height - watering.Height, watering.Width, watering.Height), 0, 0, watering.Width, watering.Height, GraphicsUnit.Pixel);//画图 
                context.Response.ContentType = "image/jpeg";//设置图片的格式 
                img.Save(context.Response.OutputStream, ImageFormat.Jpeg);//把图片保存在输出流中 
                g.Dispose();//销毁画布 
                img.Dispose();//销毁图片 
                context.Response.End(); 
            } 
            else 
            { 
                Image defaultimg = Image.FromFile(context.Server.MapPath("~/themes/images/water.jpg"));//通过图片路径得到默认图片对象 
                Image watering = Image.FromFile(context.Server.MapPath("~/themes/images/water.jpg"));//得到数字水印图片 
                Graphics g = Graphics.FromImage(defaultimg);//通过图片对象创建画布 
                g.DrawImage(watering, new Rectangle(defaultimg.Width - watering.Width, defaultimg.Height - watering.Height, watering.Width, watering.Height), 0, 0, watering.Width, watering.Height, GraphicsUnit.Pixel);//画图 
 
                context.Response.ContentType = "image/jpeg";//设置图片的格式 
                defaultimg.Save(context.Response.OutputStream, ImageFormat.Jpeg); 
                g.Dispose(); 
                defaultimg.Dispose(); 
                context.Response.End();