C# 生成唯一订单号

 1     /// 

 2     /// 生成唯一数
 3     /// 
 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         /// 

11         /// 生成
12         /// 
13         /// 前缀
14         /// 时间精确类型  1 日,2 时,3 分，4 秒(默认) 
15         /// id 小于或等于0则随机生成id
16         /// 
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                 else
31                 {
32                     number += ticks.Substring(ticks.Length - (fillCount + 3)) + GuidIntStr.PadLeft(10, ‘0‘);
33                 }
34                 return number;
35             }
36         }
37 
38         /// 

39         /// 生成
40         /// 
41         /// 前缀
42         /// 时间精确类型  1 日,2 时,3 分，4 秒(默认)
43         /// id 小于或等于0则随机生成id
44         /// 
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                 else
59                 {
60                     number += GuidIntStr.PadLeft(10, ‘0‘) + ticks.Substring(ticks.Length - (9 + fillCount));
61                 }
62                 return number;
63             }
64         }
65 
66         /// 

67         /// 获取时间字符串
68         /// 
69         /// 时间精确类型  1 日,2 时,3 分，4 秒(默认)
70         /// 填充位数
71         /// 
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     }