1 /// <summary>
2 /// 身份证帮助类
3 /// </summary>
4 public class IDCardHelper
5 {
6 #region 检测身份证的合法性
7 public static bool Check(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 if ((intStrLen != 15) && (intStrLen != 18))
18 {
19 return false;
20 }
21
22 for (int i = 0; i < intStrLen; i++)
23 {
24 varArray[i] = (char)Convert.ToInt32(idNumber[i]);
25 if (((varArray[i] - 48) < 0 || (varArray[i] - 48) > 9) && (i != 17))
26 {
27 return false;
28 }
29 else if (i < 17)
30 {
31 varArray[i] = (char)((varArray[i] - 48) * factorArr[i]);
32 }
33 }
34 if (intStrLen == 18)
35 {
36 var date8 = idNumber.Substring(6, 8);
37 if (isDate8(date8) == false)
38 {
39 return false;
40 }
41 for (int i = 0; i < 17; i++)
42 {
43 lngProduct = lngProduct + varArray[i];
44 }
45 intCheckDigit = parityBit[lngProduct % 11];
46 if (varArray[17] != intCheckDigit)
47 {
48 return false;
49 }
50 }
51 else
52 {
53 var date6 = idNumber.Substring(6, 6);
54 if (isDate6(date6) == false)
55 {
56 return false;
57 }
58 }
59 return true;
60 }
61 #endregion
62
63 #region 位身份证日期检测--年/月--6位
64 /// <summary>
65 /// 15位身份证日期检测--年/月--6位
66 /// </summary>
67 /// <param name="sDate"></param>
68 /// <returns></returns>
69 static bool isDate6(string sDate)
70 {
71 if (!System.Text.RegularExpressions.Regex.IsMatch(sDate, "^[0-9]{6}$"))
72 {
73 return false;
74 }
75 int year = Convert.ToInt32(sDate.Substring(0, 4));
76 int month = Convert.ToInt32(sDate.Substring(4, 2));
77 if (year < 1700 || year > 2500) return false;
78 if (month < 1 || month > 12) return false;
79 return true;
80 }
81 #endregion
82
83 #region 18位身份证日期检测--年/月/日--8位
84 /// <summary>
85 /// 18位身份证日期检测--年/月/日--8位
86 /// </summary>
87 /// <param name="sDate"></param>
88 /// <returns></returns>
89 static bool isDate8(string sDate)
90 {
91 if (!System.Text.RegularExpressions.Regex.IsMatch(sDate, "^[0-9]{8}$"))
92 {
93 return false;
94 }
95 int year = Convert.ToInt32(sDate.Substring(0, 4));
96 int month = Convert.ToInt32(sDate.Substring(4, 2));
97 int day = Convert.ToInt32(sDate.Substring(6, 2));
98
99 int[] iaMonthDays = new int[] { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
100 if (year < 1700 || year > 2500) return false;
101 if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) iaMonthDays[1] = 29;
102 if (month < 1 || month > 12) return false;
103 if (day < 1 || day > iaMonthDays[month - 1]) return false;
104 return true;
105 }
106 #endregion
107
108 #region 根据身份证号码获取年龄、生日
109 public static DateTime? GetBirthday(string cardId)
110 {
111 bool result = Check(cardId);
112 if (result)
113 {
114 int year = Convert.ToInt32(cardId.Substring(6, 4));
115 int month = Convert.ToInt32(cardId.Substring(10, 2));
116 int day = Convert.ToInt32(cardId.Substring(12, 2));
117 return new DateTime(year, month, day);
118 }
119 return null;
120 }
121 #endregion
122 }
