C# 生成唯一訂單號

根據GUID+DateTime.Now.Ticks生產唯一訂單號

 1     /// <summary>
 2     /// 生成唯一數
 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">首碼</param>
14         /// <param name="timeType">時間精確類型  1 日,2 時,3 分，4 秒(預設) </param>
15         /// <param name="id">id 小於或等於0則隨機生成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;//填充位數
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                 else
31                 {
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">首碼</param>
42         /// <param name="timeType">時間精確類型  1 日,2 時,3 分，4 秒(預設)</param>
43         /// <param name="id">id 小於或等於0則隨機生成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;//填充位數
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                 else
59                 {
60                     number += GuidIntStr.PadLeft(10, '0') + ticks.Substring(ticks.Length - (9 + fillCount));
61                 }
62                 return number;
63             }
64         }
65 
66         /// <summary>
67         /// 獲取時間字元串
68         /// </summary>
69         /// <param name="timeType">時間精確類型  1 日,2 時,3 分，4 秒(預設)</param>
70         /// <param name="fillCount">填充位數</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             else
91             {
92                 fillCount = 0;
93                 return time.ToString("yyyyMMddHHmmss");
94             }
95         }
96     }