C# 生成唯一订单号

根据GUID+DateTime.Now.Ticks生产唯一订单号

 1     /// <summary> 2     /// 生成唯一数 3     /// </summary> 4     public class UniqueData 5     { 6         private static object obj = new object(); 7         private static int GuidInt { get { return Guid.NewGuid().GetHashCode(); } } 8         private static string GuidIntStr { get { return Math.Abs(GuidInt).ToString(); } } 9 10         /// <summary>11         /// 生成12         /// </summary>13         /// <param name="mark">前缀</param>14         /// <param name="timeType">时间精确类型  1 日,2 时,3 分，4 秒(默认) </param>15         /// <param name="id">id 小于或等于0则随机生成id</param>16         /// <returns></returns>17         public static string Gener(string mark, int timeType = 4, int id = 0)18         {19             lock (obj)20             {21                 var number = mark;22                 var ticks = (DateTime.Now.Ticks - GuidInt).ToString();23                 int fillCount = 0;//填充位数24 25                 number += GetTimeStr(timeType, out fillCount);26                 if (id > 0)27                 {28                     number += ticks.Substring(ticks.Length - (fillCount + 3)) + id.ToString().PadLeft(10, '0');29                 }30                 else31                 {32                     number += ticks.Substring(ticks.Length - (fillCount + 3)) + GuidIntStr.PadLeft(10, '0');33                 }34                 return number;35             }36         }37 38         /// <summary>39         /// 生成40         /// </summary>41         /// <param name="mark">前缀</param>42         /// <param name="timeType">时间精确类型  1 日,2 时,3 分，4 秒(默认)</param>43         /// <param name="id">id 小于或等于0则随机生成id</param>44         /// <returns></returns>45         public static string GenerLong(string mark, int timeType = 4, long id = 0)46         {47             lock (obj)48             {49                 var number = mark;50                 var ticks = (DateTime.Now.Ticks - GuidInt).ToString();51                 int fillCount = 0;//填充位数52 53                 number += GetTimeStr(timeType, out fillCount);54                 if (id > 0)55                 {56                     number += ticks.Substring(ticks.Length - fillCount) + id.ToString().PadLeft(19, '0');57                 }58                 else59                 {60                     number += GuidIntStr.PadLeft(10, '0') + ticks.Substring(ticks.Length - (9 + fillCount));61                 }62                 return number;63             }64         }65 66         /// <summary>67         /// 获取时间字符串68         /// </summary>69         /// <param name="timeType">时间精确类型  1 日,2 时,3 分，4 秒(默认)</param>70         /// <param name="fillCount">填充位数</param>71         /// <returns></returns>72         private static string GetTimeStr(int timeType, out int fillCount)73         {74             var time = DateTime.Now;75             if (timeType == 1)76             {77                 fillCount = 6;78                 return time.ToString("yyyyMMdd");79             }80             else if (timeType == 2)81             {82                 fillCount = 4;83                 return time.ToString("yyyyMMddHH");84             }85             else if (timeType == 3)86             {87                 fillCount = 2;88                 return time.ToString("yyyyMMddHHmm");89             }90             else91             {92                 fillCount = 0;93                 return time.ToString("yyyyMMddHHmmss");94             }95         }96     }

原文出处：https://www.cnblogs.com/ylkbdw/p/9565295.html