本文实例讲述了C#实现身份证号码验证的方法。随着现在互联网的发展，越来越多的注册用户的地方都用到了身份证，那么对于输入的身份证如何验证呢？看下面的代码，其实很简单。主要注意的是，目前的身份证分为16和18位，然后分别验证校验位，省份，生日即可。
主要类如下：
/// <summary>
/// 验证身份证号码类
/// </summary>
public class IDCardValidation
{
/// <summary>
/// 验证身份证合理性
/// </summary>
/// <param name="Id"></param>
/// <returns></returns>
public bool CheckIDCard(string idNumber)
{
if (idNumber.Length == 18)
{
bool check = CheckIDCard18(idNumber);
return check;
}
else if (idNumber.Length == 15)
{
bool check = CheckIDCard15(idNumber);
return check;
}
else
{
return false;
}
}
/// <summary>
/// 18位身份证号码验证
/// </summary>
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
}
/// <summary>
/// 16位身份证号码验证
/// </summary>
private bool CheckIDCard15(string idNumber)
{
long n = 0;
if (long.TryParse(idNumber, out n) == false || n < Math.Pow(10, 14))
{
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, 6).Insert(4, "-").Insert(2, "-");
DateTime time = new DateTime();
if (DateTime.TryParse(birth, out time) == false)
{
return false;//生日验证
}
return true;
}
}
代码如下:
IDCardValidation card = new IDCardValidation();
//从网上身份证大全找来的，验证结果为true
bool result = card.CheckIDCard("522324197508045617");
Console.WriteLine(result.ToString());
//随便编的，验证结果为false
result = card.CheckIDCard("612427199901281214");
Console.WriteLine(result.ToString());
Console.ReadLine();
IDCardValidation card = new IDCardValidation();
//从网上身份证大全找来的，验证结果为true
bool result = card.CheckIDCard("522324197508045617");
Console.WriteLine(result.ToString());
//随便编的，验证结果为false
result = card.CheckIDCard("612427199901281214");
Console.WriteLine(result.ToString());
Console.ReadLine();
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