C#验证身份证的函数
投稿：hebedich
因做项目需要，参考网上资料写了一个身份证验证的C#方法，本方法是在VS2005[C/S] 下写的。前面2个是网友们的实现方法，第三个才是项目中使用的哦，小伙伴们参考下吧。
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¡"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
}
以上所述就是本文的全部内容了，希望大家能够喜欢。