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Editorial Team
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Asked: 2026-05-25T02:58:43+00:00

I’m trying to return a zipped file public FileResult Download() { MemoryStream outputStream =

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I’m trying to return a zipped file

public FileResult Download()
        {
                MemoryStream outputStream = new MemoryStream();

                using (ZipFile zip = new ZipFile())
                {
                    zip.AddEntry("asdasd.html", "<html>fgdfg</html>");
                    zip.AddEntry("asdassssd.html", "<html>asddsaf</html>");
                    zip.Save(outputStream);
                }

               return File(outputStream, "application/zip", "file.zip");
}

but in response it returns an error (in XML):

XML Parsing Error: no element found Location:
moz-nullprincipal:{122aa411-1418-43f5-b950-4347af7c7217} Line Number
1, Column 1:

What is wrong with my response (to zip files i use DotNetZip)?

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1 Answer

  1. Editorial Team

    You probably need to reset the MemoryStream to the beginning of its buffer before you return it to the client as a File.

    outputStream.Seek(0, SeekOrigin.Begin);

    I also suggest you use a proxy like Fiddler to inspect the Http response to get a better handle on what exactly your request is sending.

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