1 #region 检测是否是正确的身份证
2 /// <summary>
3 /// 身份证验证
4 /// </summary>
5 /// <param name="num"></param>
6 /// <returns></returns>
7 public static bool isIdCardNo(string cardid)
8 {
9 string num = cardid.ToUpper();
10 int[] factorArr = new int[] { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1 };
11 char[] parityBit = new char[] { '1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2' };
12 char[] varArray = new char[18];
13 var lngProduct = 0;
14 int intCheckDigit = 0;
15 var intStrLen = num.Length;
16 var idNumber = num;
17 // initialize
18 if ((intStrLen != 15) && (intStrLen != 18))
19 {
20 return false;
21 }
22 // check and set value
23
24 for (int i = 0; i < intStrLen; i++)
25 {
26 varArray[i] = (char)Convert.ToInt32(idNumber[i]);
27 if (((varArray[i] - 48) < 0 || (varArray[i] - 48) > 9) && (i != 17))
28 {
29 return false;
30 }
31 else if (i < 17)
32 {
33 varArray[i] = (char)((varArray[i] - 48) * factorArr[i]);
34 }
35 }
36 if (intStrLen == 18)
37 {
38 //check date
39 var date8 = idNumber.Substring(6, 8);
40 if (isDate8(date8) == false)
41 {
42 return false;
43 }
44 // calculate the sum of the products
45 for (int i = 0; i < 17; i++)
46 {
47 lngProduct = lngProduct + varArray[i];
48 }
49 // calculate the check digit
50 intCheckDigit = parityBit[lngProduct % 11];
51 // check last digit
52 if (varArray[17] != intCheckDigit)
53 {
54 return false;
55 }
56 }
57 else
58 { //length is 15
59 //check date
60 var date6 = idNumber.Substring(6, 6);
61 if (isDate6(date6) == false)
62 {
63 return false;
64 }
65 }
66 return true;
67 }
68
69 /// <summary>
70 /// 15位身份证日期检测--年/月--6位
71 /// </summary>
72 /// <param name="sDate"></param>
73 /// <returns></returns>
74 static bool isDate6(string sDate)
75 {
76 if (!Regex.IsMatch(sDate, "^[0-9]{6}$"))
77 {
78 return false;
79 }
80 int year, month;
81 year = Convert.ToInt32(sDate.Substring(0, 4));
82 month = Convert.ToInt32(sDate.Substring(4, 2));
83 if (year < 1700 || year > 2500) return false;
84 if (month < 1 || month > 12) return false;
85 return true;
86 }
87
88 /// <summary>
89 /// 18位身份证日期检测--年/月/日--8位
90 /// </summary>
91 /// <param name="sDate"></param>
92 /// <returns></returns>
93 static bool isDate8(string sDate)
94 {
95 if (!Regex.IsMatch(sDate, "^[0-9]{8}$"))
96 {
97 return false;
98 }
99 int year, month, day;
100 year = Convert.ToInt32(sDate.Substring(0, 4));
101 month = Convert.ToInt32(sDate.Substring(4, 2));
102 day = Convert.ToInt32(sDate.Substring(6, 2));
103 int[] iaMonthDays = new int[] { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
104 if (year < 1700 || year > 2500) return false;
105 if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) iaMonthDays[1] = 29;
106 if (month < 1 || month > 12) return false;
107 if (day < 1 || day > iaMonthDays[month - 1]) return false;
108 return true;
109 }
110 #endregion
