github:https://github.com/tomap/SevenZipSharp
The compression ratio is very high, with a 32-bit core of 64 bits

if (Environment.Is64BitProcess)
{
      SevenZipBase.SetLibraryPath("7z64.dll");
}
else
{
      SevenZipBase.SetLibraryPath("7z.dll");
}

Reference: https://www.cnblogs.com/gdouzz/p/7090710.html