MongoDB.Types.ObjectId.FromString C# (CSharp) Метод

        private static ObjectId FromString(string hex)
        {
            Contract.Requires(hex != null);
              Contract.Requires(oidString.IsMatch(hex));
              var bytes = new byte[12];
              for (int i = 0; i < 24; i += 2)
              {
            bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
              }
              return new ObjectId(bytes);
        }