C#生成一个按时间排序的GUID

/// <summary>
        /// 创建一个按时间排序的Guid
        /// </summary>
        /// <returns></returns>
        public static string GetID()
        {
            byte[] guidArray = Guid.NewGuid().ToByteArray();
            DateTime now = DateTime.Now;

            DateTime baseDate = new DateTime(1900, 1, 1);

            TimeSpan days = new TimeSpan(now.Ticks - baseDate.Ticks);

            TimeSpan msecs = new TimeSpan(now.Ticks - (new DateTime(now.Year, now.Month, now.Day).Ticks));
            byte[] daysArray = BitConverter.GetBytes(days.Days);
            byte[] msecsArray = BitConverter.GetBytes((long)(msecs.TotalMilliseconds / 3.333333));

            Array.Copy(daysArray, 0, guidArray, 2, 2);
            //毫秒高位
            Array.Copy(msecsArray, 2, guidArray, 0, 2);
            //毫秒低位
            Array.Copy(msecsArray, 0, guidArray, 4, 2);
            return new System.Guid(guidArray).ToString();
        }