Extract or Unzip Nested ZIP Archives in C# .NET

readme.md

Learn how to extract nested ZIP archives in C#: https://blog.aspose.com/2022/01/12/extract-nested-zip-archives-in-csharp-net/

extract-nested-zip.cs

// Open ZIP file in a file stream
using (FileStream zipFile = File.Open("Archives/nested-archive.zip", FileMode.Open))
{
    // Load ZIP file using Archive class
    using (Archive archive = new Archive(zipFile, new ArchiveLoadOptions()))
    {
        // Access each entry in ZIP archive
        foreach(ArchiveEntry entry in archive.Entries)
        {
            if(entry.Name.ToLower().Contains(".zip"))
            {
                // Create memory stream for nested archive
                MemoryStream nestedArchiveStream = new MemoryStream();

                // Copy archive to memory stream
                entry.Open().CopyTo(nestedArchiveStream);

                // Load the nested archive from memory stream
                using (var nestedArchive = new Archive(nestedArchiveStream))
                {
                    // Extract archive to disk.
                    nestedArchive.ExtractToDirectory("Archives/Extracted/"+entry.Name);
                }                               

            }

        } 
    }
}