C#随机生成18位身份证号码

In fact, the PIN code is just simple, but only with a checksum in the last char. With many guys asp/php and also js 's help, I get on my way!

http://blog.csdn.net/crabo/

private void GenPinCode()

{

System.Random rnd;

string[] _crabodistrict=new string[]{"350201","350202","350203","350204","350205","350206","350211","350205","350213"};

rnd = new Random(System.DateTime.Now.Millisecond);

//PIN = District + Year(50-92) + Month(01-12) + Date(01-30) + Seq(001-600)

string _pinCode=string.Format("{0}19{1}{2:00}{3:00}{4:000}",_crabodistrict[rnd.Next(0,8)],rnd.Next(50,92),rnd.Next(1,12),rnd.Next(1,30),rnd.Next(1,600));

#region Verify

char[] _chrPinCode = _pinCode.ToCharArray();

//校验码字符值

char[] _chrVerify=new char[]{'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};

//i----表示号码字符从由至左包括校验码在内的位置序号；

//ai----表示第i位置上的号码字符值；

//Wi----示第i位置上的加权因子，其数值依据公式intWeight=2（n-1）(mod 11)计算得出。

int[] _intWeight=new int[]{7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1};

int _craboWeight=0;

for(int i=0;i<17;i++)//从1 到 17 位,18为要生成的验证码

{

_craboWeight=_craboWeight+Convert.ToUInt16(_chrPinCode[i].ToString())*_intWeight[i];

}

_craboWeight=_craboWeight%11;

_pinCode+=_chrVerify[_craboWeight];

#endregion

this.txtPIN.Text=_pinCode;

}