帮我用C#winform写一个局域网聊天的代码

在C# Winform中创建一个简单的局域网聊天程序需要一些网络编程的基础知识，包括Socket通信和多线程处理。下面是一个基本的示例代码框架，展示了如何创建客户端和服务端的基本功能：

首先，我们需要创建一个服务器端的`ServerForm.cs`：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public partial class ServerForm : Form
{
    private TcpListener listener;
    public ServerForm()
    {
        InitializeComponent();
        StartServer();
    }

    private void StartServer()
    {
        listener = new TcpListener(IPAddress.Any, 8080); // 使用8080端口
        listener.Start();

        labelStatus.Text = "等待连接...";

        while (true)
        {
            Console.WriteLine("等待连接...");
            var client = listener.AcceptTcpClient(); // 接受新的连接

            Thread clientThread = new Thread(new ParameterizedThreadStart(ClientThreadProcedure));
            clientThread.Start(client);
        }
    }

    private void ClientThreadProcedure(object obj)
    {
        TcpClient client = (TcpClient)obj;
        NetworkStream stream = client.GetStream();
        
        StreamReader reader = new StreamReader(stream);
        StreamWriter writer = new StreamWriter(stream);

        string message = "";
        while ((message = reader.ReadLine()) != null)
        {
            textBoxMessages.AppendText(message + "\n");
            SendToAllClients(writer, message);
        }

        client.Close();
    }

    private void SendToAllClients(StreamWriter writer, string message)
    {
        foreach (var conn in connections) // 假设connections存储了所有连接的客户端
        {
            if (conn != writer.BaseStream)
                conn.Write(Encoding.ASCII.GetBytes(message));
        }
    }
}

然后，创建一个客户端的`ClientForm.cs`，这里我们假设有一个全局的`List<TcpClient>` `connections` 来保存所有的连接：

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

public partial class ClientForm : Form
{
    public ClientForm(string ipAddress, int port)
    {
        InitializeComponent();
        Connect(ipAddress, port);
    }

    private TcpClient client;
    private void Connect(string ipAddress, int port)
    {
        try
        {
            client = new TcpClient(ipAddress, port);
            connectionBox.AppendText($"已连接到服务器 {ipAddress}:{port}\n");

            NetworkStream stream = client.GetStream();
            SendTextBox.Text = "开始发送消息";
            SendMessage(stream);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    private void SendMessage(NetworkStream stream)
    {
        string input = sendTextBox.Text;
        byte[] data = Encoding.ASCII.GetBytes(input);
        stream.Write(data, 0, data.Length);
        sendTextBox.Clear();
    }
}

为了实现局域网范围内的通信，你需要确保服务器和客户端都在同一个局域网内。注意这只是一个非常基础的示例，实际应用中还需要考虑错误处理、用户身份验证、消息格式化等复杂情况。