C#SocketException无法连接,因为目标计算机已主动拒绝连接

首先,我用(非常简单的)以下代码启动服务器:

服务器.cs

    private readonly MessageManager _messageManager;
    private readonly ChatServer _chatServer;

    public ChatServerSkeleton()
    {
        _messageManager = new MessageManager();
        _chatServer = new ChatServer();
        Console.WriteLine("Server is running on: " + _messageManager.MyAddress);
    }

客户机.cs

    private readonly MessageManager _messageManager;
    public ChatClient ChatClient { get; }

    public ChatClientSkeleton(IPEndPoint serverAddress, string name)
    {
        _messageManager = new MessageManager();
        ChatClient = new ChatClient(new ChatServerStub(serverAddress, _messageManager), name);

        Console.WriteLine($"IPAddress of {name} is: {_messageManager.MyAddress}");
        Console.WriteLine($"IPAddress of Server is: { serverAddress}");
    }

    private readonly TcpListener _serverSocket;
    public IPEndPoint MyAddress { get; }

    public MessageManager()
    {
        try
        {
            //Create server socket on random port
            _serverSocket = new TcpListener(IPAddress.Any, FindFreeTcpPort());

            //Get host ip address
            IPAddress[] localIps = Dns.GetHostAddresses(Dns.GetHostName());
            IPAddress localhost = localIps.First(ip => ip.AddressFamily == AddressFamily.InterNetwork);

            //Get port of serversocket
            IPEndPoint ipEndPoint = _serverSocket.LocalEndpoint as IPEndPoint;
            int port = ipEndPoint.Port;

            //Create address
            MyAddress = new IPEndPoint(localhost, port);
        }
        catch (Exception ex)
        {
            Console.Error.WriteLine("Something went wrong with the serversocket:");
            Console.Error.WriteLine(ex);
        } 
    }

FindFreeTcp端口来自这里: https://stackoverflow.com/a/150974/5985593

到现在为止一切似乎都正常。例如,服务器现在 192.168.0.219:51080 还有客户 192.168.0.219:51085 .

消息管理器.cs

    public void Send(MethodCallMessage message, IPEndPoint address)
    {
        try
        {
            _serverSocket.Start();
            TcpClient destination = new TcpClient(address.Address.ToString(), address.Port);
            NetworkStream output = destination.GetStream();
            MessageReaderWriter.Write(message, output);
            destination.Close();
        }
        catch (Exception ex)
        {
            Console.Error.WriteLine("Failed to write a message:");
            Console.Error.WriteLine(ex);
        }
        finally
        {
            _serverSocket.Stop();
        }
    }

_server.Start(); 行。

有人知道我做错了什么吗?

提前谢谢!

在服务器上注册客户端时,它可以正常运行1次。但在那之后,如果我想发送一条消息,我会得到SocketException,目标机器主动拒绝了它。

消息管理器.cs

    public MethodCallMessage WReceive()
    {
        MethodCallMessage result = null;

        try
        {
            //_serverSocket.Start();
            TcpClient client = _serverSocket.AcceptTcpClient();
            NetworkStream input = new NetworkStream(client.Client, true);
            result = MessageReaderWriter.Read(input);
            client.Close();
        }
        catch (Exception ex)
        {
            Console.Error.WriteLine("Failed to receive a message:");
            Console.Error.WriteLine(ex);
        }
        finally
        {
            //_serverSocket.Stop();
        }

        return result;
    }

此方法在ServerSkeleton&ClientSkeleton中使用,如下所示:

    public void Run()
    {
        while (true)
        {
            MethodCallMessage request = _messageManager.WReceive();
            HandleRequest(request);
        }
    }

所以基本上流程如下:

1. 我启动服务器(实例化新的消息管理器,第三个片段
2. 服务器打印IP
3. 将服务器ip设置为我复制粘贴的内容
4. 启动客户端骨架(最后一个 片段)