C# 按照相应逻辑生成指定位数的随机数

  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     }
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原文地址：https://www.cnblogs.com/allenzhang/p/11233348.html