winform tcp demo

好的，我可以为您提供一个简单的WinForm TCP Demo，用于建立客户端和服务器之间的TCP连接。

首先，您需要创建两个项目：一个客户端项目和一个服务器项目。然后，将以下代码添加到每个项目中的Form1.cs文件中。

服务器代码：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace Server
{
    public partial class Form1 : Form
    {
        private TcpListener _server;
        private TcpClient _client;
        private Thread _listenThread;
        private NetworkStream _clientStream;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            StartServer();
        }

        private void StartServer()
        {
            _server = new TcpListener(IPAddress.Any, 8888);
            _server.Start();
            _listenThread = new Thread(ListenForClients);
            _listenThread.Start();
        }

        private void ListenForClients()
        {
            while (true)
            {
                _client = _server.AcceptTcpClient();
                _clientStream = _client.GetStream();

                byte[] message = Encoding.ASCII.GetBytes("Welcome to the server!");
                _clientStream.Write(message, 0, message.Length);

                Thread clientThread = new Thread(HandleClientComm);
                clientThread.Start();
            }
        }

        private void HandleClientComm()
        {
            byte[] buffer = new byte[1024];
            int bytesRead;

            while (true)
            {
                bytesRead = 0;

                try
                {
                    bytesRead = _clientStream.Read(buffer, 0, 1024);
                }
                catch
                {
                    break;
                }

                if (bytesRead == 0)
                {
                    break;
                }

                string message = Encoding.ASCII.GetString(buffer, 0, bytesRead);
                MessageBox.Show("Client says: " + message);
            }

            _client.Close();
        }
    }
}

客户端代码：

using System;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;

namespace Client
{
    public partial class Form1 : Form
    {
        private TcpClient _client;
        private NetworkStream _clientStream;

        public Form1()
        {
            InitializeComponent();
        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            try
            {
                _client = new TcpClient("localhost", 8888);
                _clientStream = _client.GetStream();

                byte[] message = new ASCIIEncoding().GetBytes("Hello, server!");
                _clientStream.Write(message, 0, message.Length);

                btnSend.Enabled = true;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            byte[] message = new ASCIIEncoding().GetBytes(txtMessage.Text);
            _clientStream.Write(message, 0, message.Length);
        }
    }
}

这些代码将创建一个TCP服务器和一个TCP客户端，当客户端与服务器建立连接时，服务器将发送一个欢迎消息。客户端可以向服务器发送消息并在对话框中显示服务器的响应。