GDI +中发生了一般错误

Question

[ExternalException (0x80004005): A generic error occurred in GDI+.]
   IpitchitImageHandler.Data.ImageRepository.AddNewTempImage(Stream image, String extension, Guid PageId, Guid ImageId, ImageTransformCollection toDoTransforms) +1967
   IpitchitImageHandler.Data.ImageRepository.AddNewTempImage(Stream image, String extension, Guid PageId, Guid ImageId) +85
   IpitchitWeb.Sell.Controls.UploadImagesSubstep.UploadImages(Object sender, EventArgs e) in F:\Documents and Settings\Vjeran\My Documents\Visual Studio 2008\Projects\Ipitchit\IpitchitWeb\Sell\Controls\UploadImagesSubstep.ascx.cs:88
   System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) +111
   System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +79
   System.Web.UI.WebControls.LinkButton.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) +175
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

我的代码是:

public void AddNewTempImage(Stream image, string extension, Guid PageId, Guid ImageId, 
    ImageTransformCollection toDoTransforms)
{
    //mapping steam to memory stream so it does support the seek

    MemoryStream targetStream = new MemoryStream(ReadStream(image, 1024));
    Image ImageToTransform=null;
    Image transformedImage = null;
    string storagePath = ImageTransformManager.Config.StorageServerPhysicalPath;
    Uri storageUrl = new Uri(ImageTransformManager.Config.StorageServerUrl);

    //string TempPath = Path.Combine(storagePath, GenerateFileName(extension));
    //SaveStream(TempPath, image);
    //File.WriteAllBytes(TempPath, ReadStream(image, 1024));

    if (!HttpContext.Current.User.Identity.IsAuthenticated)
        throw new Exception("Nonauthenticated users image submition is not supported");

        try
        {            
            foreach (ImageTransform transform in toDoTransforms)
            {
            ImageRepositoryTempImage newimage = new ImageRepositoryTempImage();
            newimage.ImageGuid = ImageId;
            newimage.PageGuid = PageId;
            newimage.CreatedBy = HttpContext.Current.User.Identity.Name;
            newimage.CreatedDate = DateTime.UtcNow;
            newimage.Format = transform.OutputType;
            newimage.Width = transform.Width;
            newimage.Height = transform.Height;
            newimage.Watermark = transform.UseWaterMark;
            string filename = GenerateFileName(transform.OutputType);
            string fullStoragePath = Path.Combine(storagePath, Path.Combine(transform.StorageFolder, filename));
            string fullStorageUrl = CombineUri(storageUrl, Path.Combine(transform.StorageFolder, filename));
            newimage.PhysicalStoragePath = fullStoragePath;
            newimage.StoragePath = fullStorageUrl;
            CheckOrAddImageTransform(transform);
            var ImgRepTransform = GetTransformation(transform);
            newimage.ImageRepositoryTransformation = ImgRepTransform;
            newimage.TransformId = ImgRepTransform.Id;

            Bitmap uploaded = new Bitmap(image);

            ImageToTransform = (Image)uploaded.Clone();
            uploaded.Dispose();
            transformedImage = transform.Transform(ImageToTransform);
            AddNewTempImage(newimage);
            //adding named watermark and transformation
            string wname = ImageTransformManager.Config.WaterMarkName;
            string wpath = ImageTransformManager.Config.WaterMarkPath;
            ChechOrAddWaterMark(wname, wpath);


            if (!(string.IsNullOrEmpty(wname) && string.IsNullOrEmpty(wpath)))
                newimage.ImageRepositoryWaterMark = GetWatermark(wname, wpath);

            transformedImage.Save(fullStoragePath, GetFormat(newimage.Format));
            }
        }
        catch (System.Exception ex)
        {
            ErrorHandling.LogErrorEvent("Add new temp image method", ex);
            throw ex;
        }
        finally
        {
            //File.Delete(TempPath);
            if (ImageToTransform!=null)
                ImageToTransform.Dispose();
            image.Dispose();
            targetStream.Dispose();
            if (transformedImage != null)
            transformedImage.Dispose();
        }

}

在我的本地机器上一切正常 - 但仍然发生..在服务器上(2003) - 我有文件夹权限......以及一切......

Answer 1

我怀着激情憎恨这个错误.通用错误可能是有史以来最无用的错误描述.

当我遇到它时,问题始终与文件IO有关.

以下是我在笔记中保留的修复列表 - 不确定这些是否适用,但他们通常会为我做这些诀窍.

• 检查文件路径
  • 确保父目录存在
  • 确保路径包含文件名和扩展名
  • 使用server.MapPath()创建路径
• 确保文件没有写回源文件.如有必要,关闭并重新打开流.

如果我从其他地方偷走了这份清单,我很抱歉.它已经在我的笔记本上了一段时间,我不记得它来自哪里.

Answer 2

我刚刚在我的托管网站上遇到了类似的问题（相同的异常）：事实证明这是一个权限问题，ASP.NET 帐户试图从其可用范围之外的目录中读取图像文件。

我建议您仔细检查权限以及<trust>web.config 中的元素，应根据文件所在位置将其设置为“中”或更高。