1          /// <summary>
 2         /// 随机中文码
 3         /// </summary>
 4         /// <returns></returns>
 5         private string GetRndCh()
 6         {
 7             System.Text.Encoding gb = System.Text.Encoding.Default;//获取GB2312编码页（表）
 8             object[] bytes = CreateRegionCode(4);//调用函数产生4个随机中文汉字编码
 9             string[] str = new string[4];
10             System.Text.StringBuilder sb = new System.Text.StringBuilder();
11             for (int i = 0; i < 4; i++)
12             {
13                 //根据汉字编码的字节数组解码出中文汉字
14                 str[i] = gb.GetString((byte[])Convert.ChangeType(bytes[i], typeof(byte[])));
15                 sb.Append( str[i].ToString());
16             }
17             return sb.ToString ();
18         }       
19
20
21         /// <summary>
22         /// 产生随机中文汉字编码
23         /// </summary>
24         /// <param name="strlength"></param>
25         /// <returns></returns>
26         private static object[] CreateRegionCode(int strlength)
27         {
28             //定义一个字符串数组储存汉字编码的组成元素
29             string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
30             Random rnd = new Random();
31             object[] bytes = new object[strlength];
32
33             for (int i = 0; i < strlength; i++)
34             {
35                 //区位码第1位
36                 int r1 = rnd.Next(11, 14);
37                 string str_r1 = rBase[r1].Trim();
38
39                 //区位码第2位
40                 rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);
41                 int r2;
42                 if (r1 == 13)
43                 {
44                     r2 = rnd.Next(0, 7);
45                 }
46                 else
47                 {
48                     r2 = rnd.Next(0, 16);
49                 }
50                 string str_r2 = rBase[r2].Trim();
51
52                 //区位码第3位
53                 rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机种子
54                 int r3 = rnd.Next(10, 16);
55                 string str_r3 = rBase[r3].Trim();
56
57                 //区位码第4位
58                 rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i);
59                 int r4;
60                 if (r3 == 10)
61                 {
62                     r4 = rnd.Next(1, 16);
63                 }
64                 else if (r3 == 15)
65                 {
66                     r4 = rnd.Next(0, 15);
67                 }
68                 else
69                 {
70                     r4 = rnd.Next(0, 16);
71                 }
72                 string str_r4 = rBase[r4].Trim();
73
74                 //定义两个字节变量存储产生的随机汉字区位码
75                 byte byte1 = Convert.ToByte(str_r1 + str_r2, 16);
76                 byte byte2 = Convert.ToByte(str_r3 + str_r4, 16);
77
78                 //将两个字节变量存储在字节数组中
79                 byte[] str_r = new byte[] { byte1, byte2 };
80
81                 //将产生的一个汉字的字节数组放入object数组中
82                 bytes.SetValue(str_r, i);
83             }
84             return bytes;
85         }