C sharp 套接字接收挂起

你好！为什么程序会在收到对字符串 answer = ReceiveDataFromServer(); 的响应之前挂起？那些。直到它收到一个套接字作为响应。如果她不明白，就挂起。如果是这样，那么它就是一个损坏的编码。

namespace HotKeyTest
{
public partial class Form1 : Form
{
    // Receiving byte array  
    byte[] bytes = new byte[1024];
    Socket senderSock;

    public Form1()
    {
        InitializeComponent();

        Boolean success = Form1.RegisterHotKey(this.Handle, this.GetType().GetHashCode(), 0x0002, 0x4c);//Set hotkey as 'ctrl+l'
    }

    private void button1_Click(object sender, EventArgs e)
    {
        StreamReader sr = new StreamReader("settings");
        IPAddress ip = IPAddress.Parse(sr.ReadLine());
        Connect(ip);
        sr.Close();
        Thread.Sleep(2000);
        Sendswitch();
        Disconnect();
    }

    private void Connect(IPAddress ip)
    {
        try
        {
            // Create one SocketPermission for socket access restrictions 
            SocketPermission permission = new SocketPermission(
                NetworkAccess.Connect,    // Connection permission 
                TransportType.Tcp,        // Defines transport types 
                "",                       // Gets the IP addresses 
                SocketPermission.AllPorts // All ports 
                );

            // Ensures the code to have permission to access a Socket 
            permission.Demand();

            // Resolves a host name to an IPHostEntry instance            
            IPHostEntry ipHost = Dns.GetHostEntry("");

            // Gets first IP address associated with a localhost 
            IPAddress ipAddr = ip;

            // Creates a network endpoint 
            IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, 55443);

            // Create one Socket object to setup Tcp connection 
            senderSock = new Socket(
                ipAddr.AddressFamily,// Specifies the addressing scheme 
                SocketType.Stream,   // The type of socket  
                ProtocolType.Tcp     // Specifies the protocols  
                );

            senderSock.NoDelay = false;   // Using the Nagle algorithm 

            // Establishes a connection to a remote host 
            senderSock.Connect(ipEndPoint);
        }
        catch (Exception exc) { MessageBox.Show(exc.ToString()); }
    }

    private void Sendswitch()
    {
        try
        {
            // Sending message 
            //<Client Quit> is the sign for end of data 
            byte[] msg = Encoding.Unicode.GetBytes("{\"id\":1,\"method\":\"get_prop\",\"params\":[\"power\", \"not_exist\", \"bright\"]}");

            // Sends data to a connected Socket. 
            int bytesSend = senderSock.Send(msg);

            Thread.Sleep(2000);

            string answer = ReceiveDataFromServer();

            MessageBox.Show(answer);
        }
        catch (Exception exc) { MessageBox.Show(exc.ToString()); }
    }

    private string ReceiveDataFromServer()
    {
        try
        {
            // Receives data from a bound Socket. 
            int bytesRec = senderSock.Receive(bytes);

            // Converts byte array to string 
            String theMessageToReceive = Encoding.Unicode.GetString(bytes, 0, bytesRec);

            // Continues to read the data till data isn't available 
            while (senderSock.Available > 0)
            {
                bytesRec = senderSock.Receive(bytes);
                theMessageToReceive += Encoding.Unicode.GetString(bytes, 0, bytesRec);
            }

            return theMessageToReceive;
        }
        catch (Exception exc) { return exc.ToString(); }
    }

    private void Disconnect()
    {
        try
        {
            // Disables sends and receives on a Socket. 
            senderSock.Shutdown(SocketShutdown.Both);

            //Closes the Socket connection and releases all resources 
            senderSock.Close();
        }
        catch (Exception exc) { MessageBox.Show(exc.ToString()); }
    }
}

}