C#使用GUID(全局统一标识符)

    class Program
    {
        static void Main(string[] args)
        {

            var uuid = Guid.NewGuid().ToString(); // 67b69599-5026-4765-8707-def49a214219

            var uuidN = Guid.NewGuid().ToString("N"); // f93618e93beb4a4181526d7a38c169a4

            var uuidD = Guid.NewGuid().ToString("D"); //c747ac63-a9c2-46f9-80d7-f635c330a59f

            var uuidB = Guid.NewGuid().ToString("B"); // {2a77d03e-0366-4977-97f1-229c17fe906f}

            var uuidP = Guid.NewGuid().ToString("P"); // (8165193f-8595-439d-bbaf-9ce55171eecf)

            var uuidX = Guid.NewGuid().ToString("X"); // {0x48645e66,0xbe0c,0x4990,{0x8e,0xee,0x3c,0x84,0xba,0xda,0x0d,0x83}}

            var guid1 = GenerateId1();//5a0aec9398c64e09

            var guid2 = GenerateId2();//4976172849618296785
        }
        
        private static  string GenerateId1()
        {
            long i = 1;
            foreach (byte b in Guid.NewGuid().ToByteArray())
            {
                i *= ((int)b + 1);
            }
            return string.Format("{0:x}", i - DateTime.Now.Ticks);
        }

        private static  long GenerateId2()
        {
            byte[] buffer = Guid.NewGuid().ToByteArray();
            return BitConverter.ToInt64(buffer, 0);
        }
    }