C # Query IP addresses by domain name (Enter CMD command parameters or start the program before entering the query)

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net;namespace IPSearch{    class Program    {        static void Main(string[] args)        {            string www = "";            if (args.Length > 0)            {                www = args[0];                if (string.IsNullOrEmpty(www) || string.IsNullOrWhiteSpace(www))                {                    Console.WriteLine("Input is empty!");                    www = inputWWW();                }            }            else            {                www = inputWWW();            }            Console.WriteLine("Search...");            while (true)            {                                             IPAddress[] ipAddresses = null;                try                {                    ipAddresses = Dns.GetHostAddresses(formatWWW(www));//Important.                }                catch (System.Exception ex)                {                    Console.WriteLine(ex.Message);                    www = inputWWW();                    continue;                }                foreach (IPAddress ipAddress in ipAddresses)                {                                        Console.WriteLine(ipAddress.ToString());                }                Console.WriteLine("Search Completed!");                Console.WriteLine("Q:Quit.Other key:Continue.");                www = Console.ReadLine();                if (www.ToUpper().Equals("Q"))                {                    break;                }                else                {                    www = inputWWW();                }                            }                   }        private static string inputWWW()        {            Console.WriteLine("Input www");            string www = Console.ReadLine();            if (string.IsNullOrEmpty(www) || string.IsNullOrWhiteSpace(www))            {                Console.WriteLine("Input is empty!If you want to exit,please input Q!");                www = Console.ReadLine();                if (www.ToUpper().Equals("Q"))                {                    Environment.Exit(1);                }                www = inputWWW();                           }              return www;        }        private static string formatWWW(string www)        {            if (string.IsNullOrEmpty(www) || string.IsNullOrWhiteSpace(www))            {                return "";            }            string newWWW = www.ToUpper().Replace("HTTP://", "");            newWWW = newWWW.Split('/')[0];            return newWWW;        }    }}