ASP.net实现信用卡检查和自定义确认控件(一)

1:     private bool ValidateCC(string creditNo)
2:     {
3:         int indicator = 1;        //-- 每隔一位数的标记 
4:         int firstNumToAdd = 0;  //-- 用来储存第一组数字的和
5:         int secondNumToAdd = 0; //-- 用来储存第二组数字的和
6:         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
7:                        
8:         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
9:                        
10:    
11:        //-- 把信用卡号字符串转换为一个字符数组
12:        char[] ccArr = creditNo.ToCharArray();
13:    
14:    for (int i=ccArr.Length-1;i>=0;i--)
15:    {
16:        char ccNoAdd = ccArr[i];
17:        int ccAdd = Int32.Parse(ccNoAdd.ToString());
18:        if (indicator == 1)
19:        {
20:            //-- 当我们碰到奇数位时,将它加入到总值里
21:           
22:            firstNumToAdd += ccAdd;
23:            //-- 将标记设为0,使下一次循环跳过此程序段
24:           
25:            indicator = 0;
26:        }
27:        else
28:        {
29:            //-- 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,
30:            //-- 相加的值再加到总值里.
31:          
32:            if ((ccAdd + ccAdd) >= 10)
33:            {
34:                int temporary = (ccAdd + ccAdd);
35:                num1 = temporary.ToString().Substring(0,1);
36:                num2 = temporary.ToString().Substring(1,1);
37:                secondNumToAdd += (Convert.ToInt32(num1) + Convert.ToInt32(num2));
38:            }
39:            else
40:            {
41:                //-- 否则,将它们相加,相加的值再加到总值里.
42:                secondNumToAdd += ccAdd + ccAdd;
43:            }
44:            //-- 将标记设为1,我们就能对下一个整数执行不同的代码
45:          
46:            indicator = 1;
47:        }
48:    }
49:        //-- 如果两个数的和被10整除,那么卡是有效的,否则,无效.
50:      
51:        bool isValid = false;
52:        if ((firstNumToAdd + secondNumToAdd) % 10 == 0)
53:        {
54:                isValid = true;
55:        }
56:        else
57:        {
58:            isValid = false;
59:        }
60:        return isValid;
61:    }

1:     private void Page_Load(object sender, System.EventArgs e)
2:     {
3:         if (Page.IsPostBack)
4:         {
5:              if (ValidateCC(CCNo.Text))
6:              {
7:                  Result.Text = "Is Valid!";
8:               }
9:          else
10:              {
11:                 Result.Text = "Nope!";
12:              }
13:         }
14:    }
15: