求助 GDI+ 中发生一般性错误...
程序在debug调试时图片保存没有问题 发布后（iis7）出现“GDI+ 中发生一般性错误”vista系统

已按网上搜索方法
1.赋予 NETWORK SERVICE 帐户以写权限。
2.保存目录确认存在
未能解决

不涉及打开 只需要保存图片
请帮忙看看 谢谢

代码如下：

C# code

if (this.FileUpload.PostedFile.ContentType.ToLower().IndexOf("image") < 0)        {            Response.Write("<script>alert('上传图片格式无效');</script>");            return;        }        else        {            //生成原图             Byte[] oFileByte = new byte[this.FileUpload.PostedFile.ContentLength];            System.IO.Stream oStream = this.FileUpload.PostedFile.InputStream;            System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);            int oWidth = oImage.Width; //原图宽度             int oHeight = oImage.Height; //原图高度             int tWidth = 100; //设置缩略图初始宽度             int tHeight = 100; //设置缩略图初始高度            //按比例计算出缩略图的宽度和高度             if (oWidth >= oHeight)            {                tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));            }            else            {                tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));            }            //生成缩略原图             Bitmap tImage = new Bitmap(tWidth, tHeight);            Graphics g = Graphics.FromImage(tImage);            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法             g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度             g.Clear(Color.Transparent); //清空画布并以透明背景色填充             g.DrawImage(oImage, new Rectangle(0, 0, tWidth, tHeight), new Rectangle(0, 0, oWidth, oHeight), GraphicsUnit.Pixel);            string dataOName = "o" + DateTime.Now.ToShortDateString().Replace("-", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg";            string dataTName = "t" + DateTime.Now.ToShortDateString().Replace("-", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg";            string oFullName = Server.MapPath(".") + "/upload/" + dataOName; //原图             string tFullName = Server.MapPath(".") + "/upload/" + dataTName; //缩略图                        string dirpath = Server.MapPath(".") + "/upload";            if (!Directory.Exists(dirpath))                Directory.CreateDirectory(dirpath);            try            {                //以JPG格式保存图片                 oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);                tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg);            }            catch (Exception ex)            {                throw ex;            }            finally            {                //释放资源                 oImage.Dispose();                g.Dispose();                tImage.Dispose();            }        }

堆栈跟踪:


[ExternalException (0x80004005): GDI+ 中发生一般性错误。]
system_product_product_insert.submit_Click(Object sender, EventArgs e) +2868
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

[解决办法]
string oFullName = Server.MapPath("~/upload/") + dataOName; //原图
[解决办法]
相应的帐户没有写权限。
指定的物理路径不存在。
保存的文件已存在并因某种原因被锁定。
在代码中使用 using 语句，释放 Image 对象所使用的所有资源。