tcp/ip客户端与服务器

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}\r\n",
DateTime.Now.ToLongTimeString(), info);
}

private void button1_Click(object sender, EventArgs e)
{

}

}
}