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 = 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 }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！
