“GDI +中发生了一般性错误”显示上传的图像时出错 [英] "A generic error occurred in GDI+" error while showing uploaded images

问题描述

我正在使用以下代码从我的asp.net mvc（C＃）应用程序中显示已保存在我的数据库中的图像：。

i am using the following code to show the image that has been saved in my database from my asp.net mvc(C#) application:.

    public ActionResult GetSiteHeaderLogo()
        {
            SiteHeader _siteHeader = new SiteHeader();
            Image imgImage = null;

            long userId = Utility.GetUserIdFromSession();

            if (userId > 0)
            {
                _siteHeader = this.siteBLL.GetSiteHeaderLogo(userId);

                if (_siteHeader.Logo != null && _siteHeader.Logo.Length > 0)
                {
                    byte[] _imageBytes = _siteHeader.Logo;
                    if (_imageBytes != null)
                    {
                        using (System.IO.MemoryStream imageStream = new System.IO.MemoryStream(_imageBytes))
                        {
                             imgImage = Image.FromStream(imageStream);
                        }
                    }
                    string sFileExtension = _siteHeader.FileName.Substring(_siteHeader.FileName.IndexOf('.') + 1, 

_siteHeader.FileName.Length - (_siteHeader.FileName.IndexOf('.') + 1));

                    Response.ContentType = Utility.GetContentTypeByExtension(sFileExtension.ToLower());
                    Response.Cache.SetCacheability(HttpCacheability.NoCache);
                    Response.BufferOutput = false;
                    if (imgImage != null)
                    {
                         ImageFormat _imageFormat = Utility.GetImageFormat(sFileExtension.ToLower());
                         imgImage.Save(Response.OutputStream, _imageFormat);
                         imgImage.Dispose();
                    }
              }
           }

       return new EmptyResult();
    }

我上传原始图片时工作正常。但是当我上传任何下载的图像时，它会抛出以下错误：

It works fine when i upload original image. But when i upload any downloaded images, it throws the following error:

 System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.

System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.
   at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams)
   at System.Drawing.Image.Save(Stream stream, ImageFormat format)

For。例如：当我上传原始图像时，它在我的网站中显示为徽标，我从网站上下载了该徽标，当我重新上传相同的下载图像时，它会抛出上述错误。这对我来说似乎很奇怪，而且无法找到它发生的原因。有什么想法吗？

For. Ex: When i upload the original image, it shows as logo in my site and i downloaded that logo from the site and when i re-upload the same downloaded image, it throws the above error. It seems very weird to me and not able to find why its happening. Any ideas on this?

推荐答案

我猜你的问题就在这里：

I'd guess that your problem lies here:

using (System.IO.MemoryStream imageStream = new System.IO.MemoryStream(_imageBytes)) 

    { 
      imgImage = Image.FromStream(imageStream); 
    } 

因为在使用.FromStream之后，Image拥有了流，可能会非常沮丧如果你关闭它。要验证是否存在问题，您可以尝试：

Because after using .FromStream, the Image owns the stream and might be very upset if you close it. To verify if that's the problem you can just try:

using (System.IO.MemoryStream imageStream = new System.IO.MemoryStream(_imageBytes)) 
{ 
  imgImage = new Bitmap( Image.FromStream(imageStream) ); 
} 

这篇关于“GDI +中发生了一般性错误”显示上传的图像时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！