Guid PK Petapoco

guid.cs

    [TableName("Tests"), PrimaryKey("Id", autoIncrement = false)]
    public class Test
    {
        public Test()
        {
            Id = GuidComb.NewGuid();
        }

        public Guid Id { get; set; }
    }

GuidComb.cs

    public static class GuidComb
    {
        public static Guid NewGuid()
        {
            byte[] b = Guid.NewGuid().ToByteArray();
            DateTime dateTime = new DateTime(1900, 1, 1);
            DateTime now = DateTime.Now;
            TimeSpan timeSpan = new TimeSpan(now.Ticks - dateTime.Ticks);
            TimeSpan timeOfDay = now.TimeOfDay;
            byte[] bytes1 = BitConverter.GetBytes(timeSpan.Days);
            byte[] bytes2 = BitConverter.GetBytes((long)(timeOfDay.TotalMilliseconds / 3.333333));
            Array.Reverse(bytes1);
            Array.Reverse(bytes2);
            Array.Copy(bytes1, bytes1.Length - 2, b, b.Length - 6, 2);
            Array.Copy(bytes2, bytes2.Length - 4, b, b.Length - 4, 4);
            return new Guid(b);
        }
    }

Insert.cs

var db = new Database("conn");
var test = new Test();
db.Insert(test);
var guid = test.Id;