how to avoid [Content_Types].xml in .net's ZipPackage class

Question

I wish to know if there is any way to avoid to have a [Content_Types].xml file inside the zip file while using .net\'s ZipPackage

Answer 1

Yes you can create zip packages without the extra XML content file added

Inspired by this link: Using System.IO.Packaging to generate a ZIP file

Using above discovery mentioned by Yiping you can avoid the extra xml file added into the package. Save zip stream from memory stream to a physical zip file before zip archive is closed like this:

public static void AddFilesToZip(string zipFilename, List filesToAdd)
{
    using (var memStream = new MemoryStream())
    {
        using (Package zip = System.IO.Packaging.Package.Open(memStream, FileMode.Create))
        {

            foreach (var fileToAdd in filesToAdd)
            {
                string destFilename = ".\\" + Path.GetFileName(fileToAdd);
                Uri uri = PackUriHelper.CreatePartUri(new Uri(destFilename, UriKind.Relative));

                //Existing parts not likely in fresh memory stream
                if (zip.PartExists(uri))
                {
                    zip.DeletePart(uri);
                }

                PackagePart part = zip.CreatePart(uri, "", CompressionOption.Normal);

                using (FileStream fileStream = new FileStream(fileToAdd, FileMode.Open, FileAccess.Read))
                {

                    using (Stream dest = part.GetStream())
                    {
                        CopyStream(fileStream, dest);
                    }
                }
            }

            //The zip Package will add an XML content type file to memeory stream when it closes
            //so before it closes we save the memorystream to physical zip file.
            using (FileStream zipfilestream = new FileStream(zipFilename, FileMode.Create, FileAccess.Write))
            {
                memStream.Position = 0;
                CopyStream(memStream, zipfilestream);
            }

            // That's it. Zip file saved to file. Things added by package after this point will be to memory stream finally disposed.
        }
    }
}