如何将 TCPListener 设置为始终侦听以及新连接何时丢弃当前连接

Question

我想承认我在c#方面不是最强的，我是通过看几个教程开发这个程序的，如果你能详细回答我将不胜感激。
我希望我的 TCP 服务器始终侦听传入连接，并且当新的 TCP 客户端连接时，我希望它丢弃旧连接并使用新连接。

我已经尝试实现这个答案；
但我的问题是当我模拟一个 TCP 客户端时，但不知何故上面的答案只会收到一条消息（我当前的代码接收所有发送的消息），我也尝试转换数据所以我收到它与下面的代码相同，但没有成功。
另外我认为上面的代码只是接受新客户端，而不丢弃以前连接的客户端。

我当前的代码可以处理连接并在断开连接后搜索新连接，我想做到这一点，所以我一直在寻找新连接，如果有新客户端想要连接我' m 丢弃当前的让新的通过

public class TCPListener
{
    public static void Listener()
    {
        TcpListener server = null;
        try
        {
            // Set the TcpListener on carPort.
            Int32 port = 5002;

            // TcpListener server = new TcpListener(port);
            server = new TcpListener(IPAddress.Any, port);

            // Start listening for client requests.
            server.Start();

            // Buffer for reading data
            Byte[] bytes = new Byte[256];
            String data = null;

            // Enter the listening loop.
            while (true)
            {
                Console.Write("Waiting for a connection... ");

                // Perform a blocking call to accept requests.
                TcpClient client = server.AcceptTcpClient();
                Console.WriteLine("Connected!");

                // Get a stream object for reading
                NetworkStream stream = client.GetStream();

                int i;

                // Loop to receive all the data sent by the client.
                while ((i = stream.Read(bytes, 0, bytes.Length)) != 0)
                {
                    // Translate data bytes to a ASCII string.
                    data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
                    Console.WriteLine("Received: {0}", data);
                }
                // Shutdown and end connection
                Console.WriteLine("Client close");
                client.Close();
            }
        }
        catch (SocketException e)
        {
            Console.WriteLine("SocketException: {0}", e);
        }
        finally
        {
            // Stop listening for new clients.
            Console.WriteLine("Stop listening for new clients.");
            server.Stop();
        }

    }
}

编辑： 如果有人需要我的问题的解决方案，那么这就是我应用 Cecilio Pardo 建议时代码的样子，效果非常好！

public class TCPListener
{
    Form form = new Form();
    public static void Listener()
    {
        TcpListener server = null;
        try
        {
            // Set the TcpListener on carPort.
            Int32 port = 5002;

            // TcpListener server = new TcpListener(port);
            server = new TcpListener(IPAddress.Any, port);

            // Start listening for client requests.
            server.Start();

            // Buffer for reading data
            Byte[] bytes = new Byte[256];
            String data = null;

            // Enter the listening loop.
            while (true)
            {
                Console.Write("Waiting for a connection... ");

                // Perform a blocking call to accept requests.
                TcpClient client = server.AcceptTcpClient();
                Console.WriteLine("Connected!");

                data = null;
                bool dataAvailable = false;
                // Get a stream object for reading
                NetworkStream stream = client.GetStream();

                int i;
                while (true)
                {
                    if (!dataAvailable)
                    {
                        dataAvailable = stream.DataAvailable;
                        //Console.WriteLine("Data Available: "+dataAvailable);
                        if (server.Pending())
                        {
                            Console.WriteLine("found new client");
                            break;
                        }
                    }

                    if (dataAvailable)
                    {
                        // Loop to receive all the data sent by the client.
                        i = stream.Read(bytes, 0, bytes.Length);
                        data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);

                        Console.WriteLine("Received: {0}", data);
                        dataAvailable = false;
                    }

                    if (server.Pending())
                    {
                        Console.WriteLine("found new client");
                        break;
                    }
                }

                Console.WriteLine("Client close");
                // Shutdown and end connection
                client.Close();
            }
        }
        catch (SocketException e)
        {
            Console.WriteLine("SocketException: {0}", e);
        }
        finally
        {
            // Stop listening for new clients.
            Console.WriteLine("Stop listening for new clients.");
            server.Stop();
        }

    }
}

Answer 1

当您处于内部 while 循环中时，您无法检查新连接。所以你必须在循环中添加这样的东西：

if ( server.Pending() ) break;

这将在另一个连接等待时立即退出循环。

另一个问题是 stream.Read 会阻塞，直到有一些数据可用，所以如果活动连接空闲，新连接将不会得到处理。所以你必须改变它，而不是调用 Read 除非有一些数据，使用 stream.DataAvailable

Answer 2

这就是我正在使用的，到目前为止它运行良好，我刚刚开始使用这种类型的应用程序。如果我对这段代码进行任何重大更改或发现错误，我将更新：

class ClientListener
{
    const int PORT_NO = 4500;
    const string SERVER_IP = "127.0.0.1";
    private TcpListener listener;

    public async Task Listen()
    {
        IPAddress localAddress = IPAddress.Parse(SERVER_IP);
        listener = new TcpListener(localAddress, PORT_NO);
        Console.WriteLine("Listening on: " + SERVER_IP + ":" + PORT_NO);
        listener.Start();

        while (true)
        {
            // Accept incoming connection that matches IP / Port number
            // We need some form of security here later
            TcpClient client = await listener.AcceptTcpClientAsync();

            if (client.Connected)
            {
                // Get the stream of data send by the server and create a buffer of data we can read
                NetworkStream stream = client.GetStream();
                byte[] buffer = new byte[client.ReceiveBufferSize];

                int bytesRead = stream.Read(buffer, 0, client.ReceiveBufferSize);

                // Convert the data recieved into a string
                string data = Encoding.ASCII.GetString(buffer, 0, bytesRead);
                Console.WriteLine("Recieved Data: " + data);
            }
        }
    }

    public void StopListening()
    {
        listener.Stop();
    }
}

如何将 TCPListener 设置为始终侦听以及新连接何时丢弃当前连接

How to set TCPListener to always listen and when new connection discard current

c#

sockets

tcp

tcplistener

networkstream