服务器不会响应超过一条消息

Question

我最近使用在 CodeProject.com 上找到的代码制作了这个服务器和客户端。我可以将数据从客户端发送到服务器一次，但在那之后，我发送的数据都没有得到确认。我需要在某处实现一个循环吗？代码如下：

    string hi;
    Socket sListener;
    Socket handler;
    Socket senderSocket;

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {

    }

    private void button1_Click(object sender, EventArgs e)
    {
        IPHostEntry ipHost = Dns.GetHostEntry("localhost");
        IPAddress ipAddr = ipHost.AddressList[0];
        IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, 4510);
        sListener = new Socket(ipAddr.AddressFamily, SocketType.Stream, ProtocolType.Tcp); 
        sListener.Bind(ipEndPoint);
        sListener.Listen(10);
        AsyncCallback aCallback = new AsyncCallback(AcceptCallback);
        sListener.BeginAccept(aCallback, sListener); 
    }

    private void AcceptCallback(IAsyncResult ar)
    {
        Socket listener = (Socket)ar.AsyncState;
        handler = listener.EndAccept(ar);
        Byte[] buffer = new Byte[1024];
        handler.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), handler);
        hi = Encoding.Unicode.GetString(buffer);
    }

    private void ReceiveCallback(IAsyncResult ar)
    {
        Socket listener = (Socket)ar.AsyncState;
        int endreceive = listener.EndReceive(ar);
    }

    private void button2_Click(object sender, EventArgs e)
    {
        IPHostEntry ipHost = Dns.GetHostEntry("localhost");
        IPAddress ipAddr = ipHost.AddressList[0];
        IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, 4510);
        senderSocket = new Socket(ipAddr.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
        senderSocket.Connect(ipEndPoint);
        byte[] msg = Encoding.Unicode.GetBytes(textBox2.Text);
        senderSocket.Send(msg); 
    }

    private void button3_Click(object sender, EventArgs e)
    {
        textBox1.Text = hi;
    }

    private void button4_Click(object sender, EventArgs e)
    {
        byte[] msg = Encoding.Unicode.GetBytes("whatuphello");
        senderSocket.Send(msg);
    }

Answer 1

使用异步 BeginReceive 方法时，您还应该调用 EndReceive。 这是一个带有示例的类似问题的链接： C# Socket.BeginReceive/EndReceive