用C＃实现由15位身份证号升级到18位的算法

1using System;
2using System.Collections;
3
4public class MyClass
5{
6    public static void Main()
7    {
8        Console.WriteLine(per15To18("429005811009091"));
9        RL();
10    }
11
12    public static string per15To18(string perIDSrc)
13 {
14   int iS = 0;
15
16   //加权因子常数
17   int[] iW=new int[]{7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
18   //校验码常数
19   string LastCode="10X98765432";
20   //新身份证号
21   string perIDNew;
22
23   perIDNew=perIDSrc.Substring(0,6);
24   //填在第6位及第7位上填上‘1’，‘9’两个数字
25   perIDNew += "19";
26
27   perIDNew += perIDSrc.Substring(6,9);
28
29   //进行加权求和
30   for( int i=0; i<17; i++)
31   {
32    iS += int.Parse(perIDNew.Substring(i,1)) * iW[i];
33   }
34
35   //取模运算，得到模值
36   int iY = iS%11;
37   //从LastCode中取得以模为索引号的值，加到身份证的最后一位，即为新身份证号。
38   perIDNew += LastCode.Substring(iY,1);
39
40   return perIDNew;
41 }
42
43
44
45
46    Helper methods#region Helper methods
47
48    private static void WL(object text, params object[] args)
49    {
50        Console.WriteLine(text.ToString(), args);
51    }
52
53    private static void RL()
54    {
55        Console.ReadLine();
56    }
57
58    private static void Break()
59    {
60        System.Diagnostics.Debugger.Break();
61    }
62
63    #endregion
64}
http://www.cnblogs.com/goody9807/archive/2006/11/13/559378.html