DAL/Function.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace GoodsProject.DAL
{
    public class Function
    {

        /// <summary>
        /// 获取一个32位ID值 chenjy 2013-08-27
        /// </summary>
        /// <returns>返回一个 32 位ID值</returns>
        public static string GetID()
        {
            byte[] guidArray = System.Guid.NewGuid().ToByteArray();
            DateTime baseDate = new DateTime(1900, 1, 1);
            DateTime now = DateTime.Now;
            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.Reverse(daysArray);
            Array.Reverse(msecsArray);
            Array.Copy(daysArray, daysArray.Length - 2, guidArray, guidArray.Length - 6, 2);
            Array.Copy(msecsArray, msecsArray.Length - 4, guidArray, guidArray.Length - 4, 4);

            return new System.Guid(guidArray).ToString().Replace("-", "").ToLower();
        }

    }
}