C#写一个socket客户端和服务器

以下是一个简单的C# Socket客户端和服务器的代码示例：

服务器端代码：

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

class Server
{
    static void Main(string[] args)
    {
        IPAddress ipAddress = IPAddress.Any;
        int port = 12345;

        TcpListener listener = new TcpListener(ipAddress, port);
        listener.Start();
        Console.WriteLine("Server started on " + ipAddress.ToString() + ":" + port);

        while (true)
        {
            TcpClient client = listener.AcceptTcpClient();
            Console.WriteLine("Client connected: " + client.Client.RemoteEndPoint.ToString());

            NetworkStream stream = client.GetStream();

            byte[] buffer = new byte[1024];
            int bytesRead = stream.Read(buffer, 0, buffer.Length);
            string message = Encoding.ASCII.GetString(buffer, 0, bytesRead);
            Console.WriteLine("Received message from client: " + message);

            byte[] data = Encoding.ASCII.GetBytes("Hello from server!");
            stream.Write(data, 0, data.Length);

            client.Close();
        }
    }
}

客户端代码：

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

class Client
{
    static void Main(string[] args)
    {
        IPAddress ipAddress = IPAddress.Parse("127.0.0.1");
        int port = 12345;

        TcpClient client = new TcpClient();
        client.Connect(ipAddress, port);
        Console.WriteLine("Connected to server on " + ipAddress.ToString() + ":" + port);

        NetworkStream stream = client.GetStream();

        string message = "Hello from client!";
        byte[] data = Encoding.ASCII.GetBytes(message);
        stream.Write(data, 0, data.Length);
        Console.WriteLine("Sent message to server: " + message);

        byte[] buffer = new byte[1024];
        int bytesRead = stream.Read(buffer, 0, buffer.Length);
        string response = Encoding.ASCII.GetString(buffer, 0, bytesRead);
        Console.WriteLine("Received message from server: " + response);

        client.Close();
    }
}

在这个例子中，服务器监听指定的IP地址和端口，当客户端连接时会处理客户端发送的消息，并回复一个简单的消息。客户端连接到服务器，发送一个简单的消息并等待服务器的响应。请注意，这个示例仅用于演示目的，实际实现时需要考虑更多的异常处理和安全问题。