c# 手写socket套接字

在C#中，你可以手动编写TCP或UDP套接字（Socket）来实现网络通信。以下是一个简单的例子，展示如何创建一个TCP服务器端和客户端：

**TCP服务器端（Server.cs）**:

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

class Server
{
    static void Main()
    {
        TcpListener listener = new TcpListener(IPAddress.Any, 1234); // 设置IP地址和端口
        listener.Start();

        Console.WriteLine("Server started. Listening on port {0}", listener.LocalEndpoint.Port);

        while (true)
        {
            TcpClient client = listener.AcceptTcpClient();
            HandleClient(client);
        }
    }

    static void HandleClient(TcpClient client)
    {
        NetworkStream stream = client.GetStream();
        using (StreamReader reader = new StreamReader(stream))
        using (StreamWriter writer = new StreamWriter(stream))
        {
            string message = reader.ReadLine();
            Console.WriteLine($"Received from client: {message}");
            writer.WriteLine("Hello, Client!");
        }

        client.Close();
    }
}

**TCP客户端（Client.cs）**:

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

class Client
{
    static void Main()
    {
        TcpClient client = new TcpClient("localhost", 1234); // 连接到服务器的IP地址和端口
        NetworkStream stream = client.GetStream();

        using (StreamWriter writer = new StreamWriter(stream))
        {
            writer.WriteLine("Hello, Server!"); // 发送消息
        }

        using (StreamReader reader = new StreamReader(stream))
        {
            string response = reader.ReadLine();
            Console.WriteLine($"Response from server: {response}");
        }

        client.Close();
    }
}

在这个示例中，服务器等待连接请求，接受新连接并处理来自客户端的消息。客户端则建立连接并向服务器发送信息，接收响应并关闭连接。