C# 控制台程序 Socket 简单使用

参考

• 豆包
• https://www.cnblogs.com/cuihongyu3503319/p/9232275.html
• https://learn.microsoft.com/zh-cn/dotnet/api/system.threading.thread?view=net-9.0#definition
• https://learn.microsoft.com/zh-cn/dotnet/api/system.threading?view=net-9.0
• https://blog.csdn.net/weixin_44295783/article/details/117464768
• https://www.cnblogs.com/Kirito-Asuna-Yoyi/p/Close_Task.html
• https://q.cnblogs.com/q/142340
• https://learn.microsoft.com/zh-cn/dotnet/api/system.net.sockets.socket.disconnect?view=net-9.0#system-net-sockets-socket-disconnect(system-boolean)
• https://learn.microsoft.com/zh-cn/dotnet/fundamentals/networking/sockets/socket-services
• https://learn.microsoft.com/zh-cn/dotnet/api/system.net.sockets.tcpclient?view=net-9.0
• https://blog.csdn.net/m0_59293490/article/details/144872081
• https://blog.csdn.net/ba_wang_mao/article/details/107392724
• https://learn.microsoft.com/zh-cn/dotnet/api/system.collections.concurrent.concurrentbag-1?view=net-9.0

环境

软件/系统	版本	说明
Windows	windows 10 专业版 22H2 64 位操作系统, 基于 x64 的处理器
git命令行工具	2.47.1.windows.1
Visual Studio Code	1.100.2
.NET Framework	9.0

代码

Socket 没有提供如监听断开连接等事件方法。

1. SERVER

   using System.Collections.Concurrent;
   using System.Net;
   using System.Net.Sockets;
   using System.Text;
   
   IPAddress iP = IPAddress.Parse("127.0.0.1");
   IPEndPoint ipEndPoint = new IPEndPoint(iP, 2300);
   
   using Socket listener = new(
   	ipEndPoint.AddressFamily,
   	SocketType.Stream,
   	ProtocolType.Tcp);
   
   listener.Bind(ipEndPoint);
   listener.Listen(100);
   
   // 客户端列表
   ConcurrentBag<Socket> clients = new();
   //
   while (true)
   {
   	var client = listener.Accept();
   	clients.Add(client);
   	Console.WriteLine("Socket server accepted client.");
   	Thread thread = new(() =>
   	{
   		while (true)
   		{
   			try
   			{
   				// 接受消息
   				var buffer = new byte[1024];
   				var received = client.Receive(buffer, SocketFlags.None);
   				var response = Encoding.UTF8.GetString(buffer, 0, received);
   				Console.WriteLine(response);
   				// 循环发送给 其他客户端
   				foreach (var i in clients)
   				{
   					// 排除自己
   					if (i == client)
   					{
   						continue;
   					}
   					// 发送消息
   					buffer = Encoding.UTF8.GetBytes(response);
   					i.Send(buffer, SocketFlags.None);
   				}
   			}
   			catch (Exception e)
   			{
   				// 移除指定客户端（如果不移除，下次连接时会导致发送一条消息后就自动下线）
   				clients.TryTake(out Socket? client);
   				// 打印异常信息
   				Console.WriteLine(e.StackTrace);
   				// 接触线程
   				break;
   			}
   		}
   
   	});
   	thread.Start();
   }
   
   

2. CLIENT

   using System.Net;
   using System.Net.Sockets;
   using System.Text;
   
   IPAddress iP = IPAddress.Parse("127.0.0.1");
   IPEndPoint ipEndPoint = new IPEndPoint(iP, 2300);
   
   using Socket client = new(
   	ipEndPoint.AddressFamily,
   	SocketType.Stream,
   	ProtocolType.Tcp);
   
   client.Connect(ipEndPoint);
   //
   // 监听服务端的消息
   Thread thread = new(() =>
   {
   	while (true)
   	{
   		try
   		{
   			// 接受消息
   			var buffer = new byte[1024];
   			var received = client.Receive(buffer, SocketFlags.None);
   			var response = Encoding.UTF8.GetString(buffer, 0, received);
   			Console.WriteLine(response);
   		}
   		catch (Exception e)
   		{
   			Console.WriteLine(e.Message);
   			break;
   		}
   	}
   });
   thread.Start();
   // 客户端发送消息
   while (true)
   {
   	var message = Console.ReadLine();
   	if (message == null)
   	{
   		continue;
   	}
   	// Console.WriteLine(message);
   	var messageBytes = Encoding.UTF8.GetBytes(message);
   	var code = client.Send(messageBytes, SocketFlags.None);
   	Console.WriteLine("code: "+code);
   }
   
   // client.Shutdown(SocketShutdown.Both);