通过身份证号获取出生日期年龄性别信息

/// <summary>
/// 根据出生日期，计算精确的年龄
/// </summary>
/// <param name="birthDay">出生日期</param>
/// <returns></returns>
public string CalculateAge(string birthDay)
{
DateTime birthDate = DateTime.Parse(birthDay);
DateTime nowDateTime = DateTime.Now;
int age = nowDateTime.Year - birthDate.Year;
//再考虑月、天的因素
if (nowDateTime.Month < birthDate.Month || (nowDateTime.Month == birthDate.Month && nowDateTime.Day < birthDate.Day))
{
age--;
}
return age.ToString();
}

/// <summary>
/// 根据身份证号，获取出生日期、年龄、性别
/// </summary>
/// <param name="identityCard"></param>
/// <returns></returns>
public string[] GetBirthdayAgeSex(string identityCard)
{
if (string.IsNullOrEmpty(identityCard))
{
return null;
}
else
{
if (identityCard.Length != 15 && identityCard.Length != 18)//身份证号码只能为15位或18位其它不合法
{
return null;
}
}

string[] entity = new string[3];
string strSex = string.Empty;
if (identityCard.Length == 18)//处理18位的身份证号码从号码中得到生日和性别代码
{
entity[0] = identityCard.Substring(6, 4) + "-" + identityCard.Substring(10, 2) + "-" + identityCard.Substring(12, 2);
strSex = identityCard.Substring(14, 3);
}
if (identityCard.Length == 15)
{
entity[0] = "19" + identityCard.Substring(6, 2) + "-" + identityCard.Substring(8, 2) + "-" + identityCard.Substring(10, 2);
strSex = identityCard.Substring(12, 3);
}

entity[1] = CalculateAge(entity[0]);//根据生日计算年龄
if (int.Parse(strSex) % 2 == 0)//性别代码为偶数是女性奇数为男性
{
entity[2] = "女";
}
else
{
entity[2] = "男";
}
return entity;
}