using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;
using?System.Threading.Tasks;
using?System.Net.Sockets;
using?System.Net;
using?System.Runtime.InteropServices;

namespace?QueryMyPublicNetworkIP
{
????class?Program
????{
????????//TCP?Client
????????public?static?string?QueryMyPublicNetworkIPbyTcp（）
????????{
????????????string?ipstr?=?string.Empty;
????????????try
????????????{
????????????????//1.Socket（）
????????????????Socket?s?=?new?Socket（AddressFamily.InterNetwork?SocketType.Stream?ProtocolType.Tcp）;
????????????????//2.Connect（）
????????????????s.Connect（“148.70.217.194“?1002）;
????????????????//3.Send（）
????????????????byte[]?buf?=?new?byte[50];
????????????????string?pass?=?“Please?tell?me?My?Public?Network?IPAddress“;
????????????????buf?=?Encoding.ASCII.GetBytes（pass）;
????????????????s.Send（buf）;
????????????????////4.Receive（）
????????????????byte[]?data?=?new?byte[50];
????????????????s.Receive（data）;
????????????????ipstr?=?Encoding.ASCII.GetString（data）.TrimEnd（‘\0‘）;
?