随着如今互联网的发展，越来越多的注冊用户的地方都用到了身份证。那么对于输入的身份证怎样验证呢？看以下的代码，事实上非常easy。

主要注意的是，眼下的身份证分为16和18位，然后分别验证校验位。省份，生日就可以。

主要类：

/// 
    /// 验证身份证号码类    /// 
    public class IDCardValidation    {        /// 
        /// 验证身份证合理性        /// 
        ///         /// 
             public bool CheckIDCard(string idNumber)        {            if (idNumber.Length == 18)            {                bool check = CheckIDCard18(idNumber);                return check;            }            else if (idNumber.Length == 15)            {                bool check = CheckIDCard15(idNumber);                return check;            }            else            {                return false;            }        }        /// 
        /// 18位身份证号码验证        /// 
        private bool CheckIDCard18(string idNumber)        {            long n = 0;            if (long.TryParse(idNumber.Remove(17), out n) == false                 || n < Math.Pow(10, 16) || long.TryParse(idNumber.Replace('x', '0').Replace('X', '0'), out n) == false)            {                return false;//数字验证            }            string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";            if (address.IndexOf(idNumber.Remove(2)) == -1)            {                return false;//省份验证            }            string birth = idNumber.Substring(6, 8).Insert(6, "-").Insert(4, "-");            DateTime time = new DateTime();            if (DateTime.TryParse(birth, out time) == false)            {                return false;//生日验证            }            string[] arrVarifyCode = ("1,0,x,9,8,7,6,5,4,3,2").Split(',');            string[] Wi = ("7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2").Split(',');            char[] Ai = idNumber.Remove(17).ToCharArray();            int sum = 0;            for (int i = 0; i < 17; i++)            {                sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());            }            int y = -1;            Math.DivRem(sum, 11, out y);            if (arrVarifyCode[y] != idNumber.Substring(17, 1).ToLower())            {                return false;//校验码验证            }            return true;//符合GB11643-1999标准        }        /// 
        /// 16位身份证号码验证        /// 
        private bool CheckIDCard15(string idNumber)        {            long n = 0;            if (long.TryParse(idNumber, out n) == false || n < Math.Pow(10, 14))            {                return false;//数字验证            }            string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";            if (address.IndexOf(idNumber.Remove(2)) == -1)            {                return false;//省份验证            }            string birth = idNumber.Substring(6, 6).Insert(4, "-").Insert(2, "-");            DateTime time = new DateTime();            if (DateTime.TryParse(birth, out time) == false)            {                return false;//生日验证            }            return true;        }     }

測试调用：

 

IDCardValidation card = new IDCardValidation();            //从网上身份证大全找来的。验证结果为true            bool result = card.CheckIDCard("522324197508045617");            Console.WriteLine(result.ToString());            //随便编的，验证结果为false            result = card.CheckIDCard("612427199901281214");            Console.WriteLine(result.ToString());            Console.ReadLine();