十五位的身份证号转为十八位

public string ID15T18(string strTemp)
  {
   string ToString=null;
   int  nTemp = 0;
   int[] ArrInt = new int[]{7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
   char[] ArrCh = new char[]{'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};
   if(strTemp.Length==15)
   {
              strTemp = strTemp.Substring(0,6) + '1'+ '9' + strTemp.Substring(6,strTemp.Length-6);
                for(int i = 0; i < strTemp.Length; i ++)
                {
                  nTemp+= Convert.ToInt16(strTemp.Substring(i,1)) * ArrInt[i];
                }
                  strTemp+= ArrCh[nTemp % 11];
      ToString = strTemp;
   }
   return ToString;
  }
转自CSDN