在C#winform中断开连接后无法重新连接服务器

我正在做一个应用程序，它要求我作为客户端连接到服务器并从服务器接收数据。当连接断开时，我需要重新连接。下面是我的代码：

   public enum MySocketState
   {
       Disconnected = 0,
       Connecting,
       Connected
   }

    private Socket _serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    private byte[] _recieveBuffer = new byte[128];

    void DataProcess()
    {
        try
        {
            if (_serverSocket == null || sockState == MySocketState.Disconnected)
            {
                Console.WriteLine("Trying to connect...");

                SetupServer();
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
    }

    private void SetupServer()
    {
        try
        {
            _serverSocket.Connect("192.168.1.11", 1000);
        }
        catch (SocketException ex)
        {
            Console.WriteLine(ex.Message);
        }

        sockState = MySocketState.Connected;
        Console.WriteLine("Server connected...");
        _serverSocket.BeginReceive(_recieveBuffer, 0, _recieveBuffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), null);

    }

    private void ReceiveCallback(IAsyncResult AR)
    {
        try
        {
            if (_serverSocket == null)
                _serverSocket = (Socket)AR.AsyncState;

            int recieved = _serverSocket.EndReceive(AR);

            if (recieved <= 0)
            {
                CloseSocket();
                return;
            }

            byte[] recData = new byte[recieved];
            Buffer.BlockCopy(_recieveBuffer, 0, recData, 0, recieved);
            string strData = ASCIIEncoding.ASCII.GetString(recData);
            Console.WriteLine(strData);

            //Process the data stored in recData
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
            CloseSocket();
        }
        finally
        {
            try
            {
                //Start receiving again
                if (_serverSocket != null)
                    _serverSocket.BeginReceive(_recieveBuffer, 0, _recieveBuffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), null);
            }
            catch (Exception ex2)
            { }
        }
    }

    public void CloseSocket()
    {
        try
        {
            if (_serverSocket != null)
            {
                if (_serverSocket.Connected)
                    _serverSocket.Shutdown(SocketShutdown.Both);
                _serverSocket.Close();
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
        _serverSocket = null;
        sockState = MySocketState.Disconnected;
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        DataProcess();
    }

---

你们知道为什么不能重新连接吗？

可能是因为在关闭Socket（）后将_serverSocket设置为null，并且在尝试重新连接时没有创建新的Socket实例

public void CloseSocket()
{
    ...
    _serverSocket = null;
    ...
}

查看错误消息中的行号

在c:\Work\Project 2015\Form1.cs:行中的fform.Form1.SetupServer（）处 143位于c:\Work\Project中的fform.Form1.DataProcess（） 2015\Form1.cs:第79行

重新连接时，您可能应该执行以下操作：

private void SetupServer()
{
    try
    {
        _serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); //Added
        _serverSocket.Connect("192.168.1.11", 1000);
    }
    ...
}

---

第79行参考DataProcess（）中的SetupServer（）行。第143行引用了_serverSocket.Connect（“192.168.1.11”，1000），这就是我在问题中提到的。正是我所怀疑的：）引用我看到的。好的，谢谢！它起作用了！但就连接和重新连接到服务器而言，这些编码是最好的方式吗？我使用BeginConnect（）以另一种方式执行此操作，但有问题。哪种方式最好？使用像这个问题中那样的直接连接或BeginConnect（）？应该使用socket.connect（）后跟socket.BeginReceive（）。socket.BeginConnect（）将在另一个线程中连接，因此socket.BeginReceive（）可能会在连接套接字之前开始接收消息，这是一个问题。

private void SetupServer()
{
    try
    {
        _serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); //Added
        _serverSocket.Connect("192.168.1.11", 1000);
    }
    ...
}