谁能帮我用c#做一个UDP或TCP聊天程序

Question

我最近想学网络编程方面，但是做的聊天程序很不成功，有哪位高手可以不啻赐教，编写一个让我研究一下？

Answer 1

MSDN多的是
：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
//添加的命名空间引用
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace UdpChatExample
{
    public partial class FormChat : Form
    {
        delegate void AddListBoxItemCallback(string text);
        AddListBoxItemCallback listBoxCallback;
        //使用的接收端口号
        private int port = 8001;
        private UdpClient udpClient;
        public FormChat()
        {
            InitializeComponent();
            listBoxCallback = new AddListBoxItemCallback(AddListBoxItem);
        }
        private void AddListBoxItem(string text)
        {
            //如果listBoxReceive被不同的线程访问则通过委托处理；
            if (listBoxReceive.InvokeRequired)
            {
                this.Invoke(listBoxCallback, text);
            }
            else
            {
                listBoxReceive.Items.Add(text);
                listBoxReceive.SelectedIndex = listBoxReceive.Items.Count - 1;
            }
        }
        /// <summary>
        /// 在后台运行的接收线程
        /// </summary>
        private void ReceiveData()
        {
            //在本机指定的端口接收
            udpClient = new UdpClient(port);
            IPEndPoint remote = null;
            //接收从远程主机发送过来的信息；
            while (true)
            {
                try
                {
                    //关闭udpClient时此句会产生异常
                    byte[] bytes = udpClient.Receive(ref remote);
                    string str = Encoding.UTF8.GetString(bytes, 0, bytes.Length);
                    AddListBoxItem(string.Format("来自{0}：{1}", remote, str));
                }
                catch
                {
                    //退出循环，结束线程
                    break;
                }
            }
        }
        /// <summary>
        /// 发送数据到远程主机
        /// </summary>
        private void sendData()
        {
            UdpClient myUdpClient = new UdpClient();
            IPAddress remoteIP;
            if (IPAddress.TryParse(textBoxRemoteIP.Text, out remoteIP) == false)
            {
                MessageBox.Show("远程IP格式不正确");
                return;
            }
            IPEndPoint iep = new IPEndPoint(remoteIP, port);
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(textBoxSend.Text);
            try
            {
                myUdpClient.Send(bytes, bytes.Length, iep);
                textBoxSend.Clear();
                myUdpClient.Close();
                textBoxSend.Focus();
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message, "发送失败");
            }
            finally
            {
                myUdpClient.Close();
            }
        }
        private void FormChat_Load(object sender, EventArgs e)
        {
            //设置listBox样式
            listBoxReceive.HorizontalScrollbar = true;
            listBoxReceive.Dock = DockStyle.Fill;
            //获取本机第一个可用IP地址
            IPAddress myIP = (IPAddress)Dns.GetHostAddresses(Dns.GetHostName()).GetValue(0);
            //为了在同一台机器调试，此IP也作为默认远程IP
            textBoxRemoteIP.Text = myIP.ToString();
            //创建一个线程接收远程主机发来的信息
            Thread myThread = new Thread(new ThreadStart(ReceiveData));
            //将线程设为后台运行
            myThread.IsBackground = true;
            myThread.Start();
            textBoxSend.Focus();
        }
        /// <summary>
        /// 单击发送按钮触发的事件
        /// </summary>
        private void buttonSend_Click(object sender, EventArgs e)
        {
            sendData();
        }
        /// <summary>
        /// 在textBoxSend中按下并释放Enter键后触发的事件
        /// </summary>
        private void textBoxData_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)Keys.Enter)
                sendData();
        }
        private void FormChat_FormClosing(object sender, FormClosingEventArgs e)
        {
            udpClient.Close();
        }
    }
}
    (3) 按<F5>键编译并执行，向默认远程主机发送一些信息，运行效果如图3-2所示。