这段C#代码主要是验证身份证的开头和身份证的格式和长度是否正确，没有按照身份证的编码规则进行严格验证

/// <summary> /// 验证身份证是否合法 /// </summary> /// <param name="idCard">要验证的身份证</param> public static bool IsIdCard(string idCard) { //如果为空，认为验证合格 if (IsNullOrEmpty(idCard)) { return true; } //清除要验证字符串中的空格 idCard = idCard.Trim(); //模式字符串 StringBuilder pattern = new StringBuilder(); pattern.Append(@"^(11|12|13|14|15|21|22|23|31|32|33|34|35|36|37|41|42|43|44|45|46|"); pattern.Append(@"50|51|52|53|54|61|62|63|64|65|71|81|82|91)"); pattern.Append(@"(\d{13}|\d{15}[\dx])$"); //验证 return RegexHelper.IsMatch(idCard, pattern.ToString()); }

更为复杂些的验证方法：

private string CheckCidInfo(string cid) { string[] aCity = new string[]{null,null,null,null,null,null,null,null,null,null,null,"北京","天津","河北","山西","内蒙古",null,null,null,null,null,"辽宁","吉林","黑龙江",null,null,null,null,null,null,null,"上海","江苏","浙江","安微","福建","江西","山东",null,null,null,"河南","湖北","湖南","广东","广西","海南",null,null,null,"重庆","四川","贵州","云南","西藏",null,null,null,null,null,null,"陕西","甘肃","青海","宁夏","新疆",null,null,null,null,null,"台湾",null,null,null,null,null,null,null,null,null,"香港","澳门",null,null,null,null,null,null,null,null,"国外"}; double iSum=0; string info=""; System.Text.RegularExpressions.Regex rg = new System.Text.RegularExpressions.Regex(@"^\d{17}(\d|x)$"); System.Text.RegularExpressions.Match mc = rg.Match(cid); if(!mc.Success) { return ""; } cid = cid.ToLower(); cid = cid.Replace("x","a"); if(aCity[int.Parse(cid.Substring(0,2))]==null) { return "非法地区"; } try { DateTime.Parse(cid.Substring(6,4)+"-"+cid.Substring(10,2)+"-"+cid.Substring(12,2)); } catch { return "非法生日"; } for(int i=17;i>=0;i--) { iSum +=(System.Math.Pow(2,i)%11)*int.Parse(cid[17-i].ToString(),System.Globalization.NumberStyles.HexNumber); } if(iSum%11!=1) return("非法证号"); return(aCity[int.Parse(cid.Substring(0,2))]+","+cid.Substring(6,4)+"-"+cid.Substring(10,2)+"-"+cid.Substring(12,2)+","+(int.Parse(cid.Substring(16,1))%2==1&iexcl;"男":"女")); }调用测试：Response.Write(CheckCidInfo("340524198002300019"));Response.Write(CheckCidInfo("34052419800101001x"));

方法三：

/// <summary>/// 身份证验证/// </summary>/// <param name="Id">身份证号</param>/// <returns></returns>public bool CheckIDCard(string Id){ if (Id.Length == 18) { bool check = CheckIDCard18(Id); return check; } else if (Id.Length == 15) { bool check = CheckIDCard15(Id); return check; } else { return false; } } /// <summary> /// 18位身份证验证 /// </summary> /// <param name="Id">身份证号</param> /// <returns></returns> PRivate bool CheckIDCard18(string Id) { long n = 0; if (long.TryParse(Id.Remove(17), out n) == false || n < Math.Pow(10, 16) || long.TryParse(Id.Replace('x', '0').Replace('X', '0'), out n) == false) { 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, 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 = Id.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] != Id.Substring(17, 1).ToLower()) { return false;//校验码验证 } return true;//符合GB11643-1999标准 } /// <summary> /// 15位身份证验证 /// </summary> /// <param name="Id">身份证号</param> /// <returns></returns> 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 }

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