网络奇怪的行为

Question

public class MultiplayerState : IState
{
    Game1 game;
    Socket sck;
    EndPoint epLocal, epRemote;
    SpriteFont font;
    string localIp, remoteIp = "192.168.137.2";
    int localPort = 80, remotePort = 80;

    public MultiplayerState(Game1 game)
    {
        this.game = game;
        sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
        localIp = GetLocalIP();
        remoteIp = localIp;
        Console.WriteLine(localIp);
        connect();
        sendMessage("Hello");
    }

    private string GetLocalIP()
    {
        IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());
        foreach (IPAddress ip in host.AddressList)
        {
            if (ip.AddressFamily == AddressFamily.InterNetwork)
                return ip.ToString();
        }
        return "127.0.0.1";
    }

    void connect()
    {

        epLocal = new IPEndPoint(IPAddress.Parse(localIp), localPort);
        sck.Bind(epLocal);

        epRemote = new IPEndPoint(IPAddress.Parse(remoteIp), remotePort);
        sck.Connect(epRemote);

        byte[] buffer = new byte[1500];
        sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);

        Console.WriteLine("Connected to " + remoteIp);
    }


    void sendMessage(string str)
    {
        System.Text.ASCIIEncoding enc = new ASCIIEncoding();
        byte[] msg = new byte[8000];
        msg = enc.GetBytes(str);

        sck.Send(msg);

    }

    void MessageCallBack(IAsyncResult aResult)
    {
        Console.WriteLine("Message received");
        byte[] buffer = new byte[1500];
        int size = 0;


        size = sck.EndReceiveFrom(aResult, ref epRemote);


        if (size > 0)
        {
            byte[] receivedData = new Byte[1464];
            receivedData = (byte[])aResult.AsyncState;

            ASCIIEncoding eEncpding = new ASCIIEncoding();
            string receivedMessage = eEncpding.GetString(receivedData);
            Console.WriteLine("received message:" + receivedMessage);
        }


        sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);
    }

    public void Update(GameTime gameTime)
    {
        if (Keyboard.GetState().IsKeyDown(Keys.Escape))
        {
            sck.Close();
            game.gameState = new MenuState(game);
        }
        if (Keyboard.GetState().IsKeyDown(Keys.Enter))
            sendMessage("Hello");

    }
}

这是我将一些字符串发送到网络上的计算机的代码。在课外需要时调用Update方法。当我创建一个实例时，一切都运行良好，直到我按Enter键，它应该在控制台上写“Hello”，但没有任何反应。另一个问题是，当我创建类的第二个实例时，代码会卡在Console.WriteLine(localIp)行上，没有任何反应。为什么会发生这种情况？我该如何解决？