tcp/ip客户端与服务器

单击“发送数据”把数据发送到指定IP地址的指定端口号

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;

namespace tcpClient
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            txtSendMssg.Text = "ceshifasong";
            Thread thrListener = new Thread(new ThreadStart(Listen));
            thrListener.Start();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            Environment.Exit(0);
        }


        
        private void btnSend_Click(object sender, EventArgs e)
        {
            TcpClient tcpClient = new TcpClient();
            tcpClient.Connect(IPAddress.Parse("127.0.0.1"), 2014);
            //tcpClient.Connect(IPAddress.Parse("192.168.1.111"), 9300);
            NetworkStream ntwStream = tcpClient.GetStream();
            if (ntwStream.CanWrite)
            {
                Byte[] bytSend = Encoding.UTF8.GetBytes(txtSendMssg.Text);
                ntwStream.Write(bytSend, 0, bytSend.Length);
            }
            else
            {
                MessageBox.Show("无法写入数据流");

                ntwStream.Close();
                tcpClient.Close();

                return;
            }

            ntwStream.Close();
            tcpClient.Close();
           
        }

        private void Listen()
        {
            Socket listener = new Socket(AddressFamily.InterNetwork,
                SocketType.Stream, ProtocolType.Tcp);
            listener.Bind(new IPEndPoint(IPAddress.Any, 9300));

            //不断监听端口
            while (true)
            {
                listener.Listen(0);
                Socket socket = listener.Accept();
                NetworkStream ntwStream = new NetworkStream(socket);
                StreamReader strmReader = new StreamReader(ntwStream);
                Invoke(new PrintRecvMssgDelegate(PrintRecvMssg),
                    new object[] { strmReader.ReadToEnd() });
                socket.Close();
            }

            //程序的listener一直不关闭
            //listener.Close();
        }

        //线程内向文本框txtRecvMssg中添加字符串及委托
        private delegate void PrintRecvMssgDelegate(string s);
        private void PrintRecvMssg(string info)
        {
            txtRecvMssg.Text += string.Format("[{0}]:{1}
",
                DateTime.Now.ToLongTimeString(), info);
        }

        private void button1_Click(object sender, EventArgs e)
        {
           
        }

    }
}