统计字符串的长度

public int WordStatistical(string CString)
{
     int digit = 0 ;
     for (int i = 0 ;i < CString.Length ; i++)
      {
          if (Convert.ToInt32(Convert.ToChar(CString.Substring(i,1)))<Convert.ToInt32(Convert.ToChar(128)))
          {
              digit += 1;
          }
          else
         {
              digit += 2;
         }
      }
      return digit;
}