program.cs

里面包括很多网络的模拟 有一个网页下载工具 基于控制台

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;


namespace SimpleEchoServer
{
    class Program
    {
        static void Main(string[] args)
        {
            int recv;
            byte[] data = new byte[1024];
            IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 9050);
            Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            newsock.Bind(ipep);
            newsock.Listen(10);
            Console.WriteLine("Waiting for a client...");
            Socket client = newsock.Accept();
            IPEndPoint clientep = (IPEndPoint)client.RemoteEndPoint;
            Console.WriteLine("Connected with {0} at port {1}",clientep.Address, clientep.Port);

            string welcome = "Welcome to my test server";
            data = Encoding.ASCII.GetBytes(welcome);
            client.Send(data, data.Length, SocketFlags.None);
            while (true)
            {
                data = new byte[1024];
                recv = client.Receive(data);
                if (recv == 0)
                    break;

                string recvStr = Encoding.ASCII.GetString(data, 0, recv);
                Console.WriteLine(recvStr);
                
                client.Send(Encoding.ASCII.GetBytes(recvStr.ToUpper()), recv, SocketFlags.None);
            }
            Console.WriteLine("Disconnected from {0}",clientep.Address);
            client.Close();
            newsock.Close();

        }
    }
}