C# 身份证号码15位和18位验证
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2022-04-09 09:01:50
/// /// 身份证 /// [Serializable] public class IDCard { /// /// 身份证号 /// public string IDCardNum { get; set; } ......
/// <summary> /// 身份证 /// </summary> [serializable] public class idcard { /// <summary> /// 身份证号 /// </summary> public string idcardnum { get; set; } /// <summary> /// 行政区 /// </summary> public string canton { get; private set; } /// <summary> /// 出生日期 /// </summary> public datetime birthday { get; private set; } /// <summary> /// 性别(0-女;1-男) /// </summary> public int gander { get; private set; } /// <summary> /// 是否为合法身份证号 /// </summary> public bool isidcard { get; private set; } public idcard() { } public idcard(string idnumber) { this.idcardnum = idnumber; } /// <summary> /// /// </summary> /// <param name="number"></param> /// <returns></returns> public static idcard parse(string number) { idcard idcard = new idcard(number); const int s5bits = 15; const int s8bits = 18; #region 15位 if (number.length == s5bits) //15位的处理 { //检查输入是否为数字 for (int i = 0; i < number.length; i++) { if ((number[i] < '0') || (number[i] > '9')) { throw new formatexception("身份证号错误"); } } //出生日期 string birthday = "19" + number.substring(6, 6); string year = birthday.substring(0, 4); string month = birthday.substring(4, 2); string day = birthday.substring(6, 2); birthday = string.format("{0}-{1}-{2}", year, month, day); datetime date = new datetime(); if (datetime.tryparse(birthday, out date)) { idcard.birthday = date; } else { throw new invalidcastexception("身份证号出生日期错误"); } //性别 if ((number[s5bits - 1] == '0') || (number[s5bits - 1] % 2 == 0)) { idcard.gander = 0; // 女 } else { idcard.gander = 1; // 男 } idcard.isidcard = true; return idcard; } #endregion #region 18位 else if (number.length == s8bits) //18位的处理 { // 检查前17位是否为数字 for (int i = 0; i < number.length -1; i++) { if ((number[i] < '0') || (number[i] > '9')) { throw new formatexception("身份证号错误"); } } char end = number[s8bits - 1]; //最后一位 //最后1位是x转成大写x if (end == 'x') { end = 'x'; number = number.substring(0, s8bits - 1) + end; } if (!(end == 'x' || (end >= '0' && end <= '9'))) { throw new formatexception("身份证号错误"); } /// 校验 int num = 0; char proof; for (int i = 17; i > 0; i--) { num = num + (int)(math.pow(2, i) % 11) * (number[17 - i] - 48); } num %= 11; switch (num) { case 0: proof = '1'; break; case 1: proof = '0'; break; case 2: proof = 'x'; break; default: proof = (char)(12 - num + 48); break; } if (end != proof) //最后一位与校验码不符 { throw new formatexception("身份证号错误"); } //出生日期 string birthday = number.substring(6, 8); string year = birthday.substring(0, 4); string month = birthday.substring(4, 2); string day = birthday.substring(6, 2); birthday = string.format("{0}-{1}-{2}", year, month, day); datetime date = new datetime(); if (datetime.tryparse(birthday, out date)) { idcard.birthday = date; } else { throw new invalidcastexception("身份证号出生日期错误"); } //行政区 idcard.canton = number.substring(0, 6); //性别 if ((number[16] == '0') || (number[16] % 2 == 0)) { idcard.gander = 0; //女 } else { idcard.gander = 1; //男 } idcard.isidcard = true; return idcard; } #endregion else { throw new formatexception("无效的身份证号码位数:" + number.length); } } public static bool tryparse(string number, out idcard card) { idcard idcard = null; bool isidcard = true; try { parse(number); } catch (exception) { isidcard = false; } card = idcard; return isidcard; } }
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