How to decompress data from a memory stream in C#

Question

I am trying to decompress a compressed base64 encoded string but have no idea how to do so. It is not a gzip and I am trying to decompress it without having to write to a file.

Answer 1

Tried suggestions from Unzip a memorystream (Contains the zip file) and get the files and finally found one that works with some changes made to use it as a method.

public static string DecompressData(string val)
    {
        byte[] bytes = Convert.FromBase64String(val).ToArray();
        Stream data = new MemoryStream(bytes);
        Stream unzippedEntryStream;  
        MemoryStream ms = new MemoryStream();
        ZipArchive archive = new ZipArchive(data);
        foreach (ZipArchiveEntry entry in archive.Entries)
        {
            unzippedEntryStream = entry.Open();
            unzippedEntryStream.CopyTo(ms);  
        }

        string result = Encoding.UTF8.GetString(ms.ToArray());
        return result;
    }