using System;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        var a = UidGenerator.NewGuid(98780853900912, 899975);

        a.Dump();

    }

​

    public static class UidGenerator

    {

        public static long NewUid(Guid guid)

        {

            byte[] guidByte = guid.ToByteArray();

            string bin1 = "";

            string bin2 = "";

            long mult = 256 * 256;

            for (int i = 0; i < 4; i++)

            {

                bin1 += guidByte[i].ToString("X").PadLeft(2, '0');

            }

​

            bin2 = guidByte[4].ToString("X").PadLeft(2, '0');

            bin2 += guidByte[5].ToString("X").PadLeft(2, '0');

            long data1 = long.Parse(bin1, NumberStyles.HexNumber);

            long data2 = long.Parse(bin2, NumberStyles.HexNumber);

            return (data2 * mult * mult) + data1;

        }

​

        public static long NewUid()

        {

            return NewUid(Guid.NewGuid());

        }

​

        public static string NewUidString(Guid guid)

        {

            return NewUid(guid).ToString().PadRight(20);

        }

​

        public static string NewUidString()

        {

            return NewUidString(Guid.NewGuid());

        }

​

        public static Guid NewGuid(long? uid, int? clientId)

        {

            if (!uid.HasValue || !clientId.HasValue)

            {

                return Guid.Empty;

            }

​

            byte[] bytes = new byte[16];

            BitConverter.GetBytes(uid.Value).CopyTo(bytes, 0);

            BitConverter.GetBytes(clientId.Value).CopyTo(bytes, 12);

            return new Guid(bytes);

        }

​

        public static Tuple<long, int> ParseGuid(Guid id)

        {

            byte[] gb = id.ToByteArray();

            long empUid = BitConverter.ToInt64(gb, 0);

            int clientId = BitConverter.ToInt32(gb, 12);

            return new Tuple<long, int>(empUid, clientId);

        }

    }

}