CODEWITHSUNDEEP
asp.net-mvcasp.net-mvc-3http-headerszip
user571874
user571874

Reputation: 589

ASP.NET MVC returns damaged zipped file

I'm trying to download zip file. But downloaded zip file is damaged or corrupted and I can't open it. I use Ionic.Zip library for create my File.zip. My code:

public static Stream LoadImages(int[] ids)
{
    var images = new List<byte[]>();
    var imgNames = new List<string>();

    foreach (var id in ids)
    {
        string fName;
        images.Add(LoadImage(id, out fName));
        imgNames.Add(fName);
    }

    MemoryStream outputStream = new MemoryStream();

    using (var zip = new Ionic.Zip.ZipFile())
    {
        for(int i = 0; i < images.Count; i++)
        {
            zip.AddEntry(imgNames[i], images[i]);
        }

        zip.Save(outputStream);
    }
    return outputStream;
}

And my Controller action:

public FileResult DownloadGallery(int[] ids)
{
    var stream = ImageManager.LoadImages(ids);
    return File(stream, "application/zip", "gallery.zip");
}

Maybe my zip file incorrect or problem in my Http Response... Have you any ideas?

Upvotes: 1

Views: 1229

Answers (1)

vcsjones
vcsjones

Reputation: 141638

You need to rewind your MemoryStream back to the beginning:

public FileResult DownloadGallery(int[] ids)
{
    var stream = ImageManager.LoadImages(ids);
    stream.Position = 0;
    return File(stream, "application/zip", "gallery.zip");
}

The FileResult only starts writing from the stream where ever its current position is.

Upvotes: 3

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