/// <summary>    /// 驗證身份證是否合法    /// </summary>    /// <param name="idCard">要驗證的身份證</param>        public static bool IsIdCard(string idCard)    {      //如果為空，認為驗證合格      if (IsNullOrEmpty(idCard))      {        return true;      }       //清除要驗證字符串中的空格      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])$");       //驗證      return RegexHelper.IsMatch(idCard, pattern.ToString());    }

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","內蒙古",null,null,null,null,null,"遼寧","吉林","黑龍江",null,null,null,null,null,null,null,"上海","江蘇","浙江","安微","福建","江西","山東",null,null,null,"河南","湖北","湖南","廣東","廣西","海南",null,null,null,"重慶","四川","貴州","云南","西藏",null,null,null,null,null,null,"陜西","甘肅","青海","寧夏","新疆",null,null,null,null,null,"臺灣",null,null,null,null,null,null,null,null,null,"香港","澳門",null,null,null,null,null,null,null,null,"國外"};  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 "非法地區";  }  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("非法證號");    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¡"男":"女"));  }調用測試：Response.Write(CheckCidInfo("340524198002300019"));Response.Write(CheckCidInfo("34052419800101001x"));

/// <summary>/// 身份證驗證/// </summary>/// <param name="Id">身份證號</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位身份證驗證 /// </summary> /// <param name="Id">身份證號</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;//數字驗證   }   string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";   if (address.IndexOf(Id.Remove(2)) == -1)   {     return false;//省份驗證   }   string birth = Id.Substring(6, 8).Insert(6, "-").Insert(4, "-");   DateTime time = new DateTime();   if (DateTime.TryParse(birth, out time) == false)   {     return false;//生日驗證   }   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;//校驗碼驗證   }   return true;//符合GB11643-1999標準 } /// <summary> /// 15位身份證驗證 /// </summary> /// <param name="Id">身份證號</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;//數字驗證   }   string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";   if (address.IndexOf(Id.Remove(2)) == -1)   {     return false;//省份驗證   }   string birth = Id.Substring(6, 6).Insert(4, "-").Insert(2, "-");   DateTime time = new DateTime();   if (DateTime.TryParse(birth, out time) == false)   {     return false;//生日驗證   }   return true;//符合15位身份證標準 }