using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;namespace ip2Long
{class Program{static void Main(string[] args){//首先,输入一个标准的IP地址 例如 192.168.1.1Console.WriteLine("请输入一个标准的IP地址 例如 192.168.1.1");//接收用户输入的数据string ip = Console.ReadLine();string IntIp = ipToLong(ip);Console.WriteLine(string.Format("IP  {0} 地址 转换后结果 :{1}", ip, IntIp));IntIp = ipToLong(ip);Console.WriteLine(string.Format("IP2  {0} 地址 转换后结果 :{1}", ip, IntIp));ip = LongToip(IntIp);Console.WriteLine(string.Format("数字 {0}  转换后IP地址结果 :{1}", IntIp, ip));Console.ReadKey();}/// <summary>/// IP地址转换为数字/// </summary>/// <param name="ip">ip地址</param>/// <returns></returns>static string ipToLong(string ip){long IntIp = 0;string[] ips = ip.Split('.');IntIp = long.Parse(ips[0]) << 0x18 | long.Parse(ips[1]) << 0x10 | long.Parse(ips[2]) << 0x8 | long.Parse(ips[3]);return IntIp.ToString();}/// <summary>/// C# 简单的写法/// </summary>/// <param name="ip"></param>/// <returns></returns>static string ipToLong2(string ip){IPAddress ipaddress = IPAddress.Parse(ip);byte[] addbuffer = ipaddress.GetAddressBytes();Array.Reverse(addbuffer);return System.BitConverter.ToUInt64(addbuffer, 0).ToString();}/// <summary>/// IP地址转换为数字/// </summary>/// <param name="ip">ip地址</param>/// <returns></returns>static string LongToip(string ip){long IntIp = long.Parse(ip);StringBuilder sb = new StringBuilder();sb.Append(IntIp >> 0x18 & 0xff).Append(".");sb.Append(IntIp >> 0x10 & 0xff).Append(".");sb.Append(IntIp >> 0x8 & 0xff).Append(".");sb.Append(IntIp & 0xff);return sb.ToString();}}
}