C#写一个可以聊天及收发文件的软件的服务端和客户端

以下是一个基本的C#聊天和文件传输软件的服务端和客户端示例代码：

服务端：

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

namespace ChatServer
{
    class Program
    {
        static TcpListener listener;
        static void Main(string[] args)
        {
            listener = new TcpListener(IPAddress.Any, 8888);
            listener.Start();
            Console.WriteLine("服务器已启动，等待客户端连接...");
            while (true)
            {
                TcpClient client = listener.AcceptTcpClient();
                Thread t = new Thread(new ParameterizedThreadStart(HandleClient));
                t.Start(client);
            }
        }

        static void HandleClient(object obj)
        {
            TcpClient client = (TcpClient)obj;
            Console.WriteLine("客户端已连接：" + client.Client.RemoteEndPoint.ToString());
            NetworkStream stream = client.GetStream();
            byte[] buffer = new byte[1024];
            int bytesRead;
            while (true)
            {
                bytesRead = 0;
                try
                {
                    bytesRead = stream.Read(buffer, 0, 1024);
                }
                catch
                {
                    break;
                }
                if (bytesRead == 0)
                {
                    break;
                }
                string message = Encoding.UTF8.GetString(buffer, 0, bytesRead);
                Console.WriteLine("收到消息：" + message);
                byte[] data = Encoding.UTF8.GetBytes("收到消息：" + message);
                stream.Write(data, 0, data.Length);
            }
            client.Close();
            Console.WriteLine("客户端已断开连接：" + client.Client.RemoteEndPoint.ToString());
        }
    }
}

客户端：

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

namespace ChatClient
{
    class Program
    {
        static TcpClient client;
        static void Main(string[] args)
        {
            Console.WriteLine("请输入服务器IP地址：");
            string ip = Console.ReadLine();
            Console.WriteLine("请输入服务器端口号：");
            int port = int.Parse(Console.ReadLine());
            client = new TcpClient();
            client.Connect(IPAddress.Parse(ip), port);
            Console.WriteLine("已连接服务器：" + client.Client.RemoteEndPoint.ToString());
            while (true)
            {
                Console.WriteLine("请输入要发送的消息：");
                string message = Console.ReadLine();
                byte[] data = Encoding.UTF8.GetBytes(message);
                NetworkStream stream = client.GetStream();
                stream.Write(data, 0, data.Length);
                data = new byte[1024];
                string responseData = string.Empty;
                int bytes = stream.Read(data, 0, data.Length);
                responseData = Encoding.UTF8.GetString(data, 0, bytes);
                Console.WriteLine(responseData);
            }
            client.Close();
        }
    }
}

这段代码实现了一个基本的聊天功能，当客户端发送消息时，服务端会将其输出并回复客户端“收到消息：XXX”。 若要实现文件传输功能，需要在代码中添加相应的逻辑。