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桌面不需要使用控件

Program.cs

internal class Program
{
    static TcpListener server;
    [STAThread]
    static void Main()
    {
        Program p = new Program();        
        p.start();
    }
    void start()
    {
        server = new TcpListener(IPAddress.Parse(GetIP()), 3333);
        server.Start(100);
        // 等待客户进行连入
        Thread th = new Thread(WaitClinetInto);
        th.Start();
    }
    List<MyClient> List = new List<MyClient>();
    void WaitClinetInto()
    {
        // 等待多个客户端进行连入
        while (true)
        {
            // 如果现在有客户端要连入了
            if (server.Pending())
            {
                TcpClient client = server.AcceptTcpClient();// 接受客户端连接
                Console.WriteLine("有客户端连入："+client.Client.RemoteEndPoint.ToString());
                // 自定义客户端 把接受消息和发消息等功能进行封装
                MyClient MC = new MyClient(client,this); // this 就是Program对象
                List.Add(MC);
                Thread.Sleep(100);
            }
        }
    }
    // 群发消息
    public void ChatGroup(string msg, MyClient my)
    {
        foreach (MyClient item in List)
        {
            if (my != item)
            {
                item.sendMessage(msg);
            }
        }
    }
    // 选择IP
     string GetIP()
    {
        Console.WriteLine("1.我的线上IP:192.168.107.72");
        Console.WriteLine("2.测试我的服务器:127.0.0.1");
        Console.WriteLine("3.其他IP地址");
        string num = Console.ReadLine();
        string ip = "";
        if (num == "1")
        {
            ip = "192.168.107.72";
        }
        else if (num =="2")
        {
            ip = "127.0.0.1";
        }
        else
        {
            Console.WriteLine("请输入你想连的服务器ip");
            ip = Console.ReadLine();
        }
        Console.WriteLine("我选择的IP是:"+ip);
        return ip;
    }

}

选着ip形式三个CW输入1,2,3选择

MyClient.cs

internal class MyClient
{
    public TcpClient Client; // Program文件获取客户端对象
    public Program Program; // program对象
    public NetworkStream Stream; // 接受或者发送消息
    public MyClient(TcpClient t1,Program p)
    {
        this.Client = t1;
        this.Program = p;
        this.Stream = t1.GetStream();

        // 开始接受数据 在异步接受数据
        // 开启分线程
        Thread th = new Thread(MytheadHandle);
        th.Start();
    }
    // 处理收发消息的
    public void MytheadHandle()
    {
        while (true)
        {
            try
            {
                byte[] bs = new byte[1024];
                // 接受数据
                int length = this.Stream.Read(bs, 0, bs.Length);
                string msg = Encoding.UTF8.GetString(bs, 0, length);
                Console.WriteLine(msg);
                if (!String.IsNullOrEmpty(msg))
                {
                    // 调用群聊的方法
                    this.Program.ChatGroup(msg,this);
                }
            }
            catch(Exception ex)
            {
                Console.WriteLine("111"+ex.Message);
                break;
            }
        }
    }
    // 封装一个发送消息的方法
    public void sendMessage(string msg)
    {
        try
        {
            byte[] bs = Encoding.UTF8.GetBytes(msg);
            this.Stream.Write(bs, 0, bs.Length);
        }
        catch (Exception e)
        {
            this.Client.Close();
            Console.WriteLine("222" + e.Message);
            
        }
    }
}

右键项目属性选择输出类型“控制台应用程序”

运行效果服务器启动成功