C# 身份证号码验证正则和验证函数

做身份证验证的时候要求能够按照标准18位身份证验证，普通正则表达式不能满足需求，所以在网上找到了这个函数，很好用，虽然还是有漏洞，不过一般乱填的号码都能被屏蔽掉

         身份证验证函数(标准18位验证)
        private bool CheckIDCard18(string idNumber)
        {
            long n = ;
            if (long.TryParse(idNumber.Remove(), out n) == false
                || n < Math.Pow(, ) || long.TryParse(idNumber.Replace('x', '').Replace('X', ''), out n) == false)
            {
                return false;//数字验证
            }
            string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
            if (address.IndexOf(idNumber.Remove()) == -)
            {
                return false;//省份验证
            }
            string birth = idNumber.Substring(, ).Insert(, "-").Insert(, "-");
            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().ToCharArray();
            int sum = ;
            for (int i = ; i < ; i++)
            {
                sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());
            }
            int y = -;
            Math.DivRem(sum, , out y);
            if (arrVarifyCode[y] != idNumber.Substring(, ).ToLower())
            {
                return false;//校验码验证
            }
            return true;//符合GB11643-1999标准
        }
private bool CheckIDCard15(string Id) { long n = 0; if (long.TryParse(Id, out n) == false || n < Math.Pow(10, 14)) { return false;//数字验证  } string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91"; if (address.IndexOf(Id.Remove(2)) == -1) { return false;//省份验证  } string birth = Id.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;//符合15位身份证标准  }

函数调用方法
if (!CheckIDCard18(“身份证号”.Text.ToString()) )
{
     MessageBox.Show("请输入正确的身份证号码！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        return;
}
                    ```
普通正则验证

if ((!Regex.IsMatch(txt_IdCard.Text, @"^(\d{15}$|^\d{18}$|^\d{17}(\d|X|x))$", RegexOptions.IgnoreCase)))
{
     MessageBox.Show("请输入正确的身份证号码！", "提示",MessageBoxButtons.OK, MessageBoxIcon.Warning);
     return;
}

最好将普通正则验证放在函数验证之前，节约资源！