编程乐趣：身份证号码验证的方法

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：

/// <summary>
    /// 验证身份证号码类
    /// </summary>
    public class IDCardValidation
    {
        /// <summary>
        /// 验证身份证合理性
        /// </summary>
        /// <param name="Id"></param>
        /// <returns></returns>
        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;
            }
        }


        /// <summary>
        /// 18位身份证号码验证
        /// </summary>
        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
        }


        /// <summary>
        /// 16位身份证号码验证
        /// </summary>
        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();