问题场景：asp.net给图片添加文字水印保存为jpg格式时出现标题所描述错误（图片为.jpg格式）；

简单验证：用本机的画图程序打开，然后保存为jpg格式会出现警告框“画图程序不能存储该文件，保存被中断  所以文件未被保存“

 

 

解决代码：

             try

            {

                using (System.Drawing.Image image = System.Drawing.Image.FromFile(@"D:\WWW\test\DownLoad\企业毕业证书.jpg"))

                {

                    #region 解决方案一，移除属性，可以保存为jpeg格式图片

                    System.Drawing.Imaging.PropertyItem[] pi = image.PropertyItems;

                    foreach (System.Drawing.Imaging.PropertyItem p in pi)

                    {

                        image.RemovePropertyItem(p.Id);

                    }

                    #endregion

                    Response.Write("1" + "\r\n");

                    //新建一个画板

                    System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(image);

                    Response.Write("2" + "\r\n");

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

                    Response.Write("3" + "\r\n");

                    //设置字体

                    System.Drawing.Font f = new System.Drawing.Font("宋体", 12);

                    Response.Write("4" + "\r\n");

                    //设置字体颜色

                    System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Black);

                    Response.Write("5" + "\r\n");

                    graphic.DrawString("2", f, b, 729, 326);

                    Response.Write("6" + "\r\n");

                    graphic.DrawString("2013", f, b, 1083, 1325);

                    graphic.DrawString("12", f, b, 1375, 1325);

                    graphic.DrawString("2", f, b, 1842, 1325);

                    graphic.DrawString("99", f, b, 2676, 1325);

                    graphic.DrawString("13", f, b, 656, 326);

                    graphic.DrawString("12", f, b, 1083, 1485);

                    graphic.DrawString("12", f, b, 1375, 1485);

                    graphic.DrawString("1", f, b, 1928, 1485);

                    graphic.DrawString("1", f, b, 2735, 1485);

                    graphic.DrawString("2013", f, b, 2494, 1837);

                    graphic.DrawString("12", f, b, 2673, 1837);

                    graphic.DrawString("31", f, b, 2790, 1837);

                    Response.Write("7" + "\r\n");

                    //设置字体

                    System.Drawing.Font f1 = new System.Drawing.Font("宋体", 18);

                    Response.Write("8" + "\r\n");

                    graphic.DrawString("2", f1, b, 1412, 988);

                    graphic.DrawString("test", f1, b, 1471, 1132);

                    Response.Write("9" + "\r\n");

                    graphic.Dispose();

                    Response.Write("10" + "\r\n");

                    string OutPath = Server.MapPath("UploadImg/毕业证书");

                    if (!Directory.Exists(OutPath))

                    {

                        Response.Write("11" + "\r\n");

                        Directory.CreateDirectory(OutPath);

                    }

                    Response.Write("12" + "\r\n");

                    string Savepath = Path.Combine(@"D:\WWW\test\UploadImg\毕业证书", "1.JPG");

                    System.Drawing.Image outimg = image;

                    Response.Write("13" + "\r\n");

                    outimg.Save(Savepath, System.Drawing.Imaging.ImageFormat.Jpeg);

                    #region 解决方案二，保存为png格式图片

                    outimg.Save(Savepath,System.Drawing.Imaging.ImageFormat.Png);

                    #endregion

                    outimg.Dispose();

                    Response.Write("14" + "\r\n");

                    Response.Write("15" + "\r\n");

                    Response.Write(Savepath);

                }

            }

            catch (Exception ex)

            {

                Response.Write(ex.Message);

            }