RandomHelper生成随机数

　　Random random=new Random();//伪随机

 1     public class RandomHelper
 2     {
 3         /// <summary>
 4         /// 获取随机数
 5         /// </summary>
 6         /// <param name="min">包含，能出现的最小值</param>
 7         /// <param name="max">包含，能出现的最大值</param>
 8         /// <returns></returns>
 9         public static int GetRandomNumber(int min, int max)
10         {
11             Guid guid = Guid.NewGuid();
12             string sGuid = guid.ToString();
13             int seed = DateTime.Now.Millisecond;
14             for (int i = 0; i < sGuid.Length; i++)
15             {
16                 switch (sGuid[i])
17                 {
18                     case 'a':
19                     case 'b':
20                     case 'c':
21                     case 'd':
22                     case 'e':
23                     case 'f':
24                     case 'g':
25                         seed = seed + 1;
26                         break;
27                     case 'h':
28                     case 'i':
29                     case 'j':
30                     case 'k':
31                     case 'l':
32                     case 'm':
33                     case 'n':
34                         seed = seed + 2;
35                         break;
36                     case 'o':
37                     case 'p':
38                     case 'q':
39                     case 'r':
40                     case 's':
41                     case 't':
42                         seed = seed + 3;
43                         break;
44                     case 'u':
45                     case 'v':
46                     case 'w':
47                     case 'x':
48                     case 'y':
49                     case 'z':
50                         seed = seed + 4;
51                         break;
52                     default:
53                         seed = seed + 4;
54                         break;
55                 }
56             }
57             Random random = new Random(seed);
58             return random.Next(min, max);
59         }
60     }

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