问在循环中接收异步采样客户端套接字

EN

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;


namespace ConsoleApplication48
{
    class Program
    {
        public class StateObject {  
            // Client socket.  
            public Socket workSocket = null;  
            // Size of receive buffer.  
            public const int BufferSize = 256;  
            // Receive buffer.  
            public byte[] buffer = new byte[BufferSize];  
            // Received data string.  
            public StringBuilder sb = new StringBuilder(); 
        }


        public class AsynchronousClient
        {
            // The port number for the remote device.  
            private const int port = 1200;

            // ManualResetEvent instances signal completion.  
            private static ManualResetEvent connectDone =
                new ManualResetEvent(false);
            private static ManualResetEvent sendDone =
                new ManualResetEvent(false);
            private static ManualResetEvent receiveDone =
                new ManualResetEvent(false);

            // The response from the remote device.  
            private static String response = String.Empty;

            private static void StartClient()
            {
                // Connect to a remote device.  
                try
                {
                    string LocalHostName = Dns.GetHostName();
                    IPHostEntry LocalHostIPEntry = Dns.GetHostEntry(LocalHostName); ;

                    IPAddress ipAddress = LocalHostIPEntry.AddressList.Where(x => !x.IsIPv6LinkLocal).FirstOrDefault();
                    IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);

                    // Create a TCP/IP socket.  
                    Socket client = new Socket(ipAddress.AddressFamily,
                        SocketType.Stream, ProtocolType.Tcp);

                    // Connect to the remote endpoint.  
                    client.BeginConnect(remoteEP,
                        new AsyncCallback(ConnectCallback), client);
                    connectDone.WaitOne();

                    // Send data to the remote device.  
                    Send(client, "HELLO");
                    sendDone.WaitOne();

                    while (true)
                    {
                        Receive(client);
                        receiveDone.WaitOne();

                        if (!string.IsNullOrWhiteSpace(response))
                            Console.WriteLine(response);
                    }

                    // Release the socket.  
                    client.Shutdown(SocketShutdown.Both);
                    client.Close();
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.ToString());
                }
            }

            private static void ConnectCallback(IAsyncResult ar)
            {
                // Retrieve the socket from the state object.  
                Socket client = (Socket)ar.AsyncState;

                // Complete the connection.  
                client.EndConnect(ar);

                Console.WriteLine("Socket connected to {0}",
                    client.RemoteEndPoint.ToString());

                // Signal that the connection has been made.  
                connectDone.Set();
            }

            private static void Receive(Socket client)
            {
                // Create the state object.  
                StateObject state = new StateObject();
                state.workSocket = client;

                // Begin receiving the data from the remote device.  
                client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                    new AsyncCallback(ReceiveCallback), state);
            }

            private static void ReceiveCallback(IAsyncResult ar)
            {
                // Retrieve the state object and the client socket   
                // from the asynchronous state object.  
                StateObject state = (StateObject)ar.AsyncState;
                Socket client = state.workSocket;

                // Read data from the remote device.  
                int bytesRead = client.EndReceive(ar);

                if (bytesRead > 0)
                {
                    // There might be more data, so store the data received so far.  
                    state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

                    Send(client, "HELLO");

                    // Get the rest of the data.  
                    client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                        new AsyncCallback(ReceiveCallback), state);
                }
                else
                {
                    // All the data has arrived; put it in response.  
                    if (state.sb.Length > 1)
                    {
                        response = state.sb.ToString();
                    }

                    // Signal that all bytes have been received.  
                    receiveDone.Set();
                }
            }

            private static void Send(Socket client, String data)
            {
                // Convert the string data to byte data using ASCII encoding.  
                byte[] byteData = Encoding.ASCII.GetBytes(data);

                // Begin sending the data to the remote device.  
                client.BeginSend(byteData, 0, byteData.Length, 0,
                    new AsyncCallback(SendCallback), client);
            }

            private static void SendCallback(IAsyncResult ar)
            {
                // Retrieve the socket from the state object.  
                Socket client = (Socket)ar.AsyncState;

                // Complete sending the data to the remote device.  
                int bytesSent = client.EndSend(ar);
                Console.WriteLine("Sent {0} bytes to server.", bytesSent);

                // Signal that all bytes have been sent.  
                sendDone.Set();
            }
            public static void AcceptCallback(IAsyncResult ar) {  
                // Signal the main thread to continue.  

                // Get the socket that handles the client request.  
                TcpListener  listener = (TcpListener) ar.AsyncState;  
                Socket handler = listener.Server.EndAccept(ar);  

                // Create the state object.  
                StateObject state = new StateObject();  
                state.workSocket = handler;  
                handler.BeginReceive( state.buffer, 0, StateObject.BufferSize, 0,  
                    new AsyncCallback(ListenerReadCallback), state);  
            }  

            public static void ListenerReadCallback(IAsyncResult ar) {  
                String content = String.Empty;  

                // Retrieve the state object and the handler socket  
                // from the asynchronous state object.  
                StateObject state = (StateObject) ar.AsyncState;  
                Socket handler = state.workSocket;  

                // Read data from the client socket.   
                int bytesRead = handler.EndReceive(ar);  

                if (bytesRead > 0) {  

                        handler.BeginSend(state.buffer, 0, bytesRead, 0,  
                           new AsyncCallback(ListenerSendCallback), handler);  
                } 
                // Not all data received. Get more.  
                handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,  
                new AsyncCallback(ListenerReadCallback), state);    
            }
            private static void ListenerSendCallback(IAsyncResult ar) {
                Socket handler = (Socket)ar.AsyncState; 
                int bytesSent = handler.EndSend(ar);  
            }
            static void Main(string[] args)
            {
                TcpListener listener = new TcpListener(IPAddress.Any, 1200);
                listener.Start();
                listener.Server.BeginAccept(   
                    new AsyncCallback(AcceptCallback),  
                    listener );
                StartClient();

            }
        }
    }

}