ASP.net实现信用卡检查和自定义确认控件(二)[1]

1:     using system;
2:     using system.web.ui;
3:     using system.web.ui.webcontrols;
4:     
5:     namespace customvalidators
6:     {
7:     /// <summary>
8:     /// summary description for class1.
9:     /// </summary>
10:    
11:    //-- 从 basevalidator 类继承过来, 从而可以基类的一些功能.
12:    public class creditcardvalidator : basevalidator
13:    {
14:      protected override bool evaluateisvalid()
15:      {
16:        //--  把validation 控件的 controltovalidate 值赋给valuetovalidate.
17:        string valuetovalidate = this.getcontrolvalidationvalue(this.controltovalidate);
18:        int indicator = 1;        //-- 每隔一位数的标记
19:        int firstnumtoadd = 0;  //-- 用来储存第一组数字的和
20:        int secondnumtoadd = 0; //-- 用来储存第二组数字的和
21:        string num1;    //-- 用于当每隔一位数相加的和大于10时,储存最左边的整数
22:                        
23:        string num2;    //-- 用于当每隔一位数相加的和大于10时,储存最右边的整数
24:                        
25:    
26:        //-- 把信用卡号字符串转换为一个字符数组
27:        char[] ccarr = valuetovalidate.tochararray();
28:    
29:        for (int i=ccarr.length-1;i>=0;i--)
30:        {
31:        char ccnoadd = ccarr[i];
32:        int ccadd = int32.parse(ccnoadd.tostring());
33:        if (indicator == 1)
34:        {
35:        //-- 当我们碰到奇数位时,将它加入到总值里
36:        firstnumtoadd += ccadd;
37:        //-- 将标记设为0,使下一次循环跳过此程序段
38:        indicator = 0;
39:        }
40:        else
41:        {
42:        //-- 如果当前整数乘以2之后大于10,就将和分为两个整数并将它们相加,
43:        //-- 相加的值再加到总值里.
44:        
45:        if ((ccadd + ccadd) >= 10)
46:        {
47:            int temporary = (ccadd + ccadd);
48:            num1 = temporary.tostring().substring(0,1);
49:            num2 = temporary.tostring().substring(1,1);
50:            secondnumtoadd += (convert.toint32(num1) + convert.toint32(num2));
51:        }
52:        else
53:        {
54:            //-- 否则,将它们相加,相加的值再加到总值里.
55:            secondnumtoadd += ccadd + ccadd;
56:        }
57:        //-- //-- 将标记设为1,我们就能对下一个整数执行不同的代码
58:        
59:        indicator = 1;
60:        }
61:        }
62:        //-- 如果两个数的和被10整除,那么卡是有效的,否则,无效.
63:        
64:        bool isvalid = false;
65:        if ((firstnumtoadd + secondnumtoadd) % 10 == 0)
66:        {
67:            isvalid = true;
68:        }
69:        else
70:        {
71:            isvalid = false;
72:        }
73:        return isvalid;
74:            }                
75:        }
76:    }
77: