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

namespace ConsoleApplication1
{
    public static class SocketTest
    {
        private static Encoding encode = Encoding.Default;

        /// <summary>
        /// 监听请求
        /// </summary>
        /// <param name="port"></param>
        public static void Listen(int port)
        {
            Socket listenSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            listenSocket.Bind(new IPEndPoint(IPAddress.Any, port));
            listenSocket.Listen(100);
            Console.WriteLine("Listen " + port + " ...");

            while (true)
            {
                Socket acceptSocket = listenSocket.Accept();
                string receiveData = Receive(acceptSocket, 1000); //1 seconds timeout.
                Console.WriteLine("Receive：" + receiveData);
                Send(acceptSocket, "ok");
                DestroySocket(acceptSocket); //import
            }
        }

        /// <summary>
        /// 发送数据
        /// </summary>
        /// <param name="host"></param>
        /// <param name="port"></param>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string Send(string host, int port, string data)
        {
            string result = string.Empty;

            Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            clientSocket.Connect(host, port);
            Send(clientSocket, data);
            result = Receive(clientSocket, 1000 * 2); //1*2 seconds timeout.
            DestroySocket(clientSocket);
            //Console.WriteLine("Send：{0}\r\nReceive：{1}", data, result);

            return result;
        }

        /// <summary>
        /// 发送数据
        /// </summary>
        /// <param name="socket"></param>
        /// <param name="data"></param>
        private static void Send(Socket socket, string data)
        {
            socket.Send(encode.GetBytes(data));
        }

        /// <summary>
        /// 接收数据
        /// </summary>
        /// <param name="socket"></param>
        /// <param name="timeout"></param>
        /// <returns></returns>
        private static string Receive(Socket socket, int timeout)
        {
            string result = string.Empty;

            socket.ReceiveTimeout = timeout;
            List<byte> data = new List<byte>();
            byte[] buffer = new byte[1024];
            int length = 0;
            try //timeout Exception
            {
                //心得：
                //1.若缓冲区buffer比接收数据小，需多次Receive才能完成；
                //2.多次Receive时，每次接收字节数length大小不固定；
                while ((length = socket.Receive(buffer)) > 0)
                {
                    for (int j = 0; j < length; j++)
                    {
                        data.Add(buffer[j]);
                    }
                    //if (length < buffer.Length) { break; }
                }
            }
            catch { }
            if (data.Count > 0)
            {
                result = encode.GetString(data.ToArray(), 0, data.Count);
            }

            return result;
        }

        /// <summary>
        /// 销毁Socket对象
        /// </summary>
        /// <param name="socket"></param>
        private static void DestroySocket(Socket socket)
        {
            if (socket != null)
            {
                if (socket.Connected)
                {
                    socket.Shutdown(SocketShutdown.Both);
                }
                socket.Close();
            }
        }
    }
}

SocketTest.Listen(8888);

string data = "mzwu.com";
string result = SocketTest.Send("127.0.0.1", 8888, data);
Console.WriteLine("Send：{0}\r\nReceive：{1}", data, result);

byte[] buffer = new byte[1024];
int length = socket.Receive(buffer);
Console.WriteLine("Receive length: " + length);
while (length > 0)
{
    //todo
                
    length = socket.Receive(buffer);
    Console.WriteLine("Receive length: " + length);
}