MARKUS

using System;

using System.Collections.Generic;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

using System.Threading.Tasks;

namespace Markus.Service.Extensions

{

    public static class GuidExtension

    {

        public static Guid CreateUniqueGuid(this Guid guid)

        {

            return GetUniqueGuid();

        }

        private static Guid GetUniqueGuid()

        {

            char[] chars = "ABCDEF1234567890".ToCharArray();

            byte[] data = new byte[1];

            System.Security.Cryptography.RNGCryptoServiceProvider crypto = new System.Security.Cryptography.RNGCryptoServiceProvider();

            crypto.GetNonZeroBytes(data);

            data = new byte[32];

            crypto.GetNonZeroBytes(data);

            StringBuilder result = new StringBuilder(32);

            foreach (byte b in data)

            {

                result.Append(chars[b % (chars.Length - 1)]);

            }

            return Guid.ParseExact(result.ToString(0, 8) + "-" + result.ToString(8, 4) + "-" + result.ToString(11, 4) + "-"

                + result.ToString(16, 4) + "-" + result.ToString(20, 12), "D");

        }

        public static string shortGuid()

        {

            byte[] numArray = new byte[16];

            using (RandomNumberGenerator randomNumberGenerator = RandomNumberGenerator.Create())

                randomNumberGenerator.GetBytes(numArray);

            return Convert.ToBase64String(new Guid(numArray).ToByteArray()).Substring(0, 10).Replace("/", "").Replace("+", "") + DateTime.UtcNow.Ticks.ToString("x");

        }

    }

}