1
//生成23位的随机数
public class RandomHash
2 {
3 public static System.Collections.Generic.Dictionary<string, HashSet<string>> Hashtable = new Dictionary<string, HashSet<string>>();
4
5 /// <summary>
6 /// Check digit（模10）
7 /// </summary>
8 /// <param name="num"></param>
9 /// <returns></returns>
10 public static string Genchecknum(string num)
11 {
12 string result = string.Empty;
13 try
14 {
15 if (num.Length == 22)
16 {
17 int sum = 0;
18 for (int i = 0; i < 22; i++)
19 {
20 int dit = 0;
21 //is Odd
22 if (Convert.ToBoolean(i % 2))
23 {
24 dit = int.Parse(num.Substring(i, 1)) * 2;
25 if (dit > 9)
26 dit = dit - 9;
27 }
28 else
29 {
30 dit = int.Parse(num.Substring(i, 1));
31 }
32 sum = sum + dit;
33 }
34 double doublesum = Math.Ceiling(Convert.ToDouble(sum) / 10) * 10;
35 result = (doublesum - sum).ToString();
36 }
37 }
38 catch
39 {
40 }
41 return result;
42 }
43
44 public static string GenRandom(string acct, string country, string type, string tranName)
45 {
46 string refnum = string.Empty;
47 Random random = new Random();
48 DateTime dt = DateTime.Now;
49 string acctnum = string.Empty;
50 string prefix = string.Empty;
51 string fieldType = string.Empty;
52 string binNum = string.Empty;
53 try
54 {
55 prefix = "7";
56 acctnum = binNum == null ? acct.Substring(0, 6) : binNum;
57 }
58 catch (Exception ex)
59 {
60 throw ex;
61 }
62 string ID = dt.ToString("yyyyMMddHHmmss");
63 {
64 if (Hashtable.ContainsKey(ID))
65 {
66 bool isnotunique = true;
67 int runnum = 0;
68 do
69 {
70 string ran = random.Next(99999).ToString("00000");
71 //refNum 由站位数字prefix + acct账号的前6位 + 年份的最后一位数字 + 当天是当年的第多少天 + 当前的HHmmss + 五位的随机数， 以及 校验生成的一位数字
72 refnum = prefix + acctnum + dt.Year.ToString().Substring(3, 1) + dt.DayOfYear.ToString("000") + dt.ToString("HHmmss") + ran;
73
74 string checknum = Genchecknum(refnum);
75 refnum = refnum + checknum;
76 //插入非重的Refnum到Hashtable中去，确保同一秒种生成的RefNum不出现重复
77 if (!Hashtable[ID].Contains(refnum))
78 {
79 isnotunique = false;
80 Hashtable[ID].Add(refnum);
81 }
82 //循环再获取新的Refnum
83 runnum++;
84 if (runnum > 50000)
85 {
86 dt = DateTime.Now;
87 ID = dt.ToString("yyyyMMddHHmmss");
88 }
89 } while (isnotunique);
90
91 }
92 else
93 {
94 Hashtable.Clear();
95 string ran = random.Next(99999).ToString("00000");
96 refnum = prefix + acctnum + dt.Year.ToString().Substring(3, 1) + dt.DayOfYear.ToString("000") + dt.ToString("HHmmss") + ran;
97
98 string checknum = Genchecknum(refnum);
99 refnum = refnum + checknum;
100 HashSet<string> hs = new HashSet<string>();
101 hs.Add(refnum);
102 Hashtable.Add(ID, hs);
103 }
104 }
105 return refnum;
106 }
107 }
