TCP Socket服务端客户端（二）

本文服务端客户端封装代码转自https://blog.csdn.net/zhujunxxxxx/article/details/44258719，并作了简单的修改。

1）服务端

此类主要处理服务端相关消息

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

namespace TcpSocketServer
{
    /// <summary>
    /// Socket异步TCP服务器 
    /// 建议把close方法改为私有，即服务端不主动关闭连接
    /// 客户端主动关闭连接后，其receive仍在
    /// </summary>
    public class TCPServerAsync : IDisposable
    {
        #region Fields  

        private int _maxClient;// 服务器程序允许的最大客户端连接数

        private int _clientCount;// 当前的连接的客户端数  
 
        private Socket _serverSock;// 服务器使用的异步socket 
   
        private List<ClientInfo> _clients;// 客户端会话列表 

        private bool disposed = false;//内存释放

        #endregion

        #region Properties 

        public bool IsRunning { get; private set; }// 服务器是否正在运行 

        public IPAddress Address { get; private set; }// 监听的IP地址 

        public int Port { get; private set; }// 监听的端口  
 
        public Encoding Encoding { get; set; }// 通信使用的编码

        #endregion
  
        #region 构造函数  

        /// <summary>  
        /// 异步Socket TCP服务器  
        /// </summary>  
        public TCPServerAsync(int listenPort)
            : this(IPAddress.Any, listenPort, 1024)
        {
        }

        public TCPServerAsync(IPEndPoint localEP)
            : this(localEP.Address, localEP.Port, 1024)
        {
        }

        public TCPServerAsync(IPAddress localIPAddress, int listenPort, int maxClient)
        {
            this.Address = localIPAddress;
            this.Port = listenPort;
            this.Encoding = Encoding.Default;

            _maxClient = maxClient;
            _clients = new List<ClientInfo>();
            _serverSock = new Socket(localIPAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
        }

        #endregion

        #region Method 

        /// <summary>  
        /// 启动服务器  
        /// </summary>  
        public void Start()
        {
            if (!IsRunning)
            {
                IsRunning = true;
                _serverSock.Bind(new IPEndPoint(this.Address, this.Port));
                _serverSock.Listen(1024);
                _serverSock.BeginAccept(new AsyncCallback(HandleAcceptConnected), _serverSock);
            }
        }

        /// <summary>  
        /// 启动服务器  
        /// </summary>  
        /// <param name="backlog">  
        /// 服务器所允许的挂起连接序列的最大长度  
        /// </param>  
        public void Start(int backlog)
        {
            if (!IsRunning)
            {
                IsRunning = true;
                _serverSock.Bind(new IPEndPoint(this.Address, this.Port));
                _serverSock.Listen(backlog);
                _serverSock.BeginAccept(new AsyncCallback(HandleAcceptConnected), _serverSock);
            }
        }

        /// <summary>  
        /// 停止服务器  
        /// </summary>  
        public void Stop()
        {
            if (IsRunning)
            {
                IsRunning = false;
                _serverSock.Close();
                //TODO 关闭对所有客户端的连接  
                CloseAllClient();
            }
        }

        #region Close  
        /// <summary>  
        /// 关闭一个与客户端之间的会话  
        /// </summary>  
        /// <param name="state">需要关闭的客户端会话对象</param>  
        public void Close(ClientInfo state)
        {
            if (state != null)
            {
                //state.Datagram = null;
                state.RecvDataBuffer = null;

                _clients.Remove(state);
                _clientCount--;
                //TODO 触发关闭事件  
                state.Close();
            }
        }
        /// <summary>  
        /// 关闭所有的客户端会话,与所有的客户端连接会断开  
        /// </summary>  
        public void CloseAllClient()
        {
            foreach (ClientInfo client in _clients)
            {
                Close(client);
            }
            _clientCount = 0;
            _clients.Clear();
        }
        #endregion

        /// <summary>  
        /// 处理客户端连接  
        /// </summary>  
        /// <param name="ar"></param>  
        private void HandleAcceptConnected(IAsyncResult ar)
        {
            if (IsRunning)
            {
                Socket server = (Socket)ar.AsyncState;
                Socket client = server.EndAccept(ar);

                //检查是否达到最大的允许的客户端数目  
                if (_clientCount >= _maxClient)
                {
                    //C-TODO 触发事件  
                    RaiseOtherException(null);
                }
                else
                {
                    ClientInfo state = new ClientInfo(client);
                    lock (_clients)
                    {
                        _clients.Add(state);
                        _clientCount++;
                        RaiseClientConnected(state); //触发客户端连接事件  
                    }
                    state.RecvDataBuffer = new byte[client.ReceiveBufferSize];
                    //开始接受来自该客户端的数据  
                    client.BeginReceive(state.RecvDataBuffer, 0, state.RecvDataBuffer.Length, SocketFlags.None,
                     new AsyncCallback(HandleDataReceived), state);
                }
                //接受下一个请求  
                server.BeginAccept(new AsyncCallback(HandleAcceptConnected), ar.AsyncState);
            }
        }
        /// <summary>  
        /// 处理客户端数据  
        /// </summary>  
        /// <param name="ar"></param>  
        private void HandleDataReceived(IAsyncResult ar)
        {
            if (IsRunning)
            {
                ClientInfo state = (ClientInfo)ar.AsyncState;
                Socket client = state.ClientSocket;
                try
                {
                    //异步接收,当客户端退出的时候会再次执行EndReceive                      
                    int recv = client.EndReceive(ar);

     //客户端主动断开连接时(采用close关闭）recv == 0
     //所以执行回掉RaiseClientDisconnected,并在回掉函数中关闭连接
     //以不在RaiseClientDisconnected回掉中关闭连接为优，即直接调用Close关闭
     if (recv == 0)
                    {
                        //C- TODO 触发事件 (关闭客户端)  
                        //Close(state);
                        RaiseClientDisconnected(state);
                        return;
                    }
                    //TODO 处理已经读取的数据 ps:数据在state的RecvDataBuffer中  
                    state._recvdBufferLength = recv;
                    //C- TODO 触发数据接收事件  
                    RaiseDataReceived(state);
                }
                catch (SocketException)
                {
                    //C- TODO 异常处理  
                    RaiseNetError(state);
     //客户端主动断开连接时(直接关闭程序，而非采用close关闭）引发以尝
     //所以执行回掉RaiseClientDisconnected,并在回掉函数中关闭连接
     //以不在回掉中关闭连接为优，直接/Close(state)关闭
     state._recvdBufferLength = 0;
                    RaiseClientDisconnected(state);
                    return;
                }

                //继续接收来自来客户端的数据 
                //ps: 如果未接收到数据则始终处于挂起状态；
                //pss:当收到close消息，server主动关闭连接（212行RaiseDataReceived中进行了关闭）时由于已经关闭连接，所以下述代码会有异常
                //后续可在应用只要不是通过客户端发消息主动close就可避免此问题，所以在此加一个异常处理，或者加一个bool变量判断是否断掉
                try
                {
                    client.BeginReceive(state.RecvDataBuffer, 0, state.RecvDataBuffer.Length, SocketFlags.None,
                     new AsyncCallback(HandleDataReceived), state);
                }
                catch{}   
            }
        }

        /// <summary>  
        /// 发送数据  
        /// </summary>  
        /// <param name="state">接收数据的客户端会话</param>  
        /// <param name="data">数据报文</param>  
        public void Send(ClientInfo state, byte[] data)
        {
            RaisePrepareSend(state);
            Send(state.ClientSocket, data);
        }

        /// <summary>  
        /// 异步发送数据至指定的客户端  
        /// </summary>  
        /// <param name="client">客户端</param>  
        /// <param name="data">报文</param>  
        public void Send(Socket client, byte[] data)
        {
            if (!IsRunning)
                throw new InvalidProgramException("This TCP Scoket server has not been started.");

            if (client == null)
                throw new ArgumentNullException("client");

            if (data == null)
                throw new ArgumentNullException("data");
            client.BeginSend(data, 0, data.Length, SocketFlags.None,
             new AsyncCallback(SendDataEnd), client);
        }

        /// <summary>  
        /// 发送数据完成处理函数  
        /// </summary>  
        /// <param name="ar">目标客户端Socket</param>  
        private void SendDataEnd(IAsyncResult ar)
        {
            ((Socket)ar.AsyncState).EndSend(ar);
            RaiseCompletedSend(new TcpSocketServer.ClientInfo((Socket)ar.AsyncState));
        }
        #endregion

        #region 事件 

        #region 客户端连接事件
        public event EventHandler<TCPMessageArgs> ClientConnecting;//客户端正在连接事件
        public event EventHandler<TCPMessageArgs> ClientConnected; //客户端连接事件     
        public event EventHandler<TCPMessageArgs> ClientDisconnected;//客户端断开连接
        //挂起事件
        private void RaiseClientConnecting(ClientInfo state)
        {
            if(ClientConnecting!=null)
            {
                ClientConnecting(this, new TCPMessageArgs(state));
            }
        }
        private void RaiseClientConnected(ClientInfo state)
        {
            if (ClientConnected != null)
            {
                ClientConnected(this, new TCPMessageArgs(state));
            }
        }
        private void RaiseClientDisconnected(ClientInfo state)
        {
            if (ClientDisconnected != null)
            {
                ClientDisconnected(this, new TCPMessageArgs(state));
            }
        }
        #endregion

        #region 数据发送事件 
        public event EventHandler<TCPMessageArgs> PrepareSend;//数据准备发送事件
        public event EventHandler<TCPMessageArgs> DataSending;//数据正在发送事件
        public event EventHandler<TCPMessageArgs> CompletedSend;//数据发送结束事件
        public event EventHandler<TCPMessageArgs> DataReceived;//接受到客户端数据事件
        //挂起事件
        private void RaisePrepareSend(ClientInfo state)
        {
            if (PrepareSend != null)
            {
                PrepareSend(this, new TCPMessageArgs(state));
            }
        }
        private void RaiseDataSending(ClientInfo state)
        {
            if (PrepareSend != null)
            {
                DataSending(this, new TCPMessageArgs(state));
            }
        }
        private void RaiseDataReceived(ClientInfo state)
        {
            if (DataReceived != null)
            {
                DataReceived(this, new TCPMessageArgs(state));
            }
        }
        private void RaiseCompletedSend(ClientInfo state)
        {
            if (CompletedSend != null)
            {
                CompletedSend(this, new TCPMessageArgs(state));
            }
        }
        #endregion

        #region 关闭连接事件
        public event EventHandler<TCPMessageArgs> ClientClose;//关闭客户端事件
        public event EventHandler<TCPMessageArgs> AllClientsClose;//关闭所有客户端事件
        //挂起事件
        private void RaiseClientClose(ClientInfo state)
        {
            if(ClientClose!=null)
            {
                ClientClose(this, new TcpSocketServer.TCPMessageArgs(state));
            }
        }
        private void RaiseAllClientClose(ClientInfo state)
        {
            if (AllClientsClose != null)
            {
                AllClientsClose(this, new TcpSocketServer.TCPMessageArgs(state));
            }
        }
        #endregion

        #region 其他事件
        public event EventHandler<TCPMessageArgs> NetError;// 网络错误事件 
        public event EventHandler<TCPMessageArgs> OtherException;//其他异常
        //挂起事件
        private void RaiseNetError(ClientInfo state)
        {
            if (OtherException != null)
            {
                OtherException(this, new TCPMessageArgs(state));
            }
        }
        private void RaiseOtherException(ClientInfo state)
        {
            RaiseOtherException(state);
        }
        #endregion

        #endregion

        #region 释放  
        /// <summary>  
        /// Performs application-defined tasks associated with freeing,   
        /// releasing, or resetting unmanaged resources.  
        /// </summary>  
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        /// <summary>  
        /// Releases unmanaged and - optionally - managed resources  
        /// </summary>  
        /// <param name="disposing"><c>true</c> to release   
        /// both managed and unmanaged resources; <c>false</c>   
        /// to release only unmanaged resources.</param>  
        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    try
                    {
                        Stop();
                        if (_serverSock != null)
                        {
                            _serverSock = null;
                        }
                    }
                    catch (SocketException)
                    {
                        //TODO  
                        RaiseOtherException(null);
                    }
                }
                disposed = true;
            }
        }
        #endregion
    }
}

2）客户端

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

namespace TcpSocketClient
{
    public class TCPClientAsync
    {
        #region 字段

        private Socket clientSock;

        //private byte[] recvBuffer;

        private ClientInfo state;

        #endregion

        #region 属性

        public IPAddress Address { get; private set; }// 监听的IP地址  

        public int Port { get; private set; }// 监听的端口  
        public bool IsConnected { get;private set; }

        #endregion

        #region 构造方法

        public TCPClientAsync(IPAddress ipAddress,int port)
        {
            this.Address = ipAddress;
            this.Port = port;
            clientSock=new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        }

        public TCPClientAsync(IPEndPoint ipEndPort)
            :this(ipEndPort.Address,ipEndPort.Port)
        {
        }

        #endregion

        #region Method

        public void Connect()//开始连接
        {
            if(!IsConnected)
            {
                //clientSock.BeginConnect(Address, Port, new AsyncCallback(HandleConnectAccepted), clientSock);
                clientSock.BeginConnect(Address, Port, iAsyncResult=>
                {
                    try
                    {
                        clientSock.EndConnect(iAsyncResult);
                        IsConnected = true;
                        state = new TcpSocketClient.ClientInfo(clientSock);
                        RaiseConnectAccepted(state);//挂起连接事件
                    }
                    catch
                    {
                        //TODO连接失败
                        RaiseConnectFailed();
                    }
                    
                }, null);
            }            
        }

        //private void HandleConnectAccepted(IAsyncResult iAsyncResult)
        //{
        //    clientSock.EndConnect(iAsyncResult);
        //    IsConnected = true;
        //}

        public void Send(byte[] data)
        {
            if (!IsConnected) return;

            //clientSock.BeginSend(data, 0, data.Length, SocketFlags.None, new AsyncCallback(HandleDataSend), null);
            clientSock.BeginSend(data, 0, data.Length, SocketFlags.None, iAsyncResult=>
            {
                clientSock.EndSend(iAsyncResult);

                RaiseDataSend(state);
            }, null);
        }

        public void Receive()
        {
            if (!IsConnected) return;

            state.RecvDataBuffer = new byte[clientSock.ReceiveBufferSize];
            clientSock.BeginReceive(state.RecvDataBuffer, 0, state.RecvDataBuffer.Length, SocketFlags.None, new AsyncCallback(HandleDataReceive), null);
        }

        private void HandleDataReceive(IAsyncResult iAsyncResult)
        {
            int recv = 0;
            try
            {
                recv = clientSock.EndReceive(iAsyncResult);

                if (recv == 0)//客户端主动断开连接时recv=0
                {
                    Close();
                    RaiseServerCloseLink();
                    return;
                }

                state._recvdBufferLength = recv;

                RaiseDataReceived(state);
            }
            catch(Exception ex)
            {
                //TODO 信息获取失败
                string str = ex.Message;
                return;
            }

            //if (!IsConnected) return;
            clientSock.BeginReceive(state.RecvDataBuffer, 0, state.RecvDataBuffer.Length, SocketFlags.None, new AsyncCallback(HandleDataReceive), null);
        }
        //private void HandleDataSend(IAsyncResult iAsyncResult)
        //{
        //    clientSock.EndSend(iAsyncResult);
        //}

        public void Close()
        {
            //关闭数据的接受和发送  
            clientSock.Shutdown(SocketShutdown.Both);

            //清理资源  
            clientSock.Close();

            state = null;
            IsConnected = false;
            GC.Collect();
        }
        #endregion

        #region 事件

        public event EventHandler<TCPMessageArgs> ConnectAccepted;//连接事件 

        public event EventHandler<TCPMessageArgs> DataSend;//数据发送事件  

        public event EventHandler<TCPMessageArgs> DataReceived;//数据发送事件

        public event EventHandler<TCPMessageArgs> ErrorException;//错误信息

        public event EventHandler<TCPMessageArgs> ServerCloseLink;//服务端关闭连接

        public event EventHandler<TCPMessageArgs> ConnectFailed;//连接失败

        private void RaiseConnectAccepted(ClientInfo state)
        {
            if (ConnectAccepted != null)
            {
                ConnectAccepted(this, new TCPMessageArgs(state));
            }
        }

        private void RaiseDataSend(ClientInfo state)
        {
            if (DataSend != null)
            {
                DataSend(this, new TcpSocketClient.TCPMessageArgs(state));
            }
        }

        private void RaiseDataReceived(ClientInfo state)
        {
            if(DataReceived!=null)
            {
                DataReceived(this, new TcpSocketClient.TCPMessageArgs(state));
            }
        }

        private void RaiseErrorException()
        {
            if(ErrorException!=null)
            {
                ErrorException(this, null);
            }
        }

        private void RaiseServerCloseLink()
        {
            if(ServerCloseLink!=null)
            {
                ServerCloseLink(this, null);
            }
        }

        private void RaiseConnectFailed()
        {
            if(ConnectFailed!=null)
            {
                ConnectFailed(this,null);
            }
        }

        #endregion
    }
}

3）消息类

此类存储相关消息

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TcpSocketServer
{
    /// <summary>
    /// Socket TCP事件参数
    /// </summary>
    public class TCPMessageArgs : EventArgs
    {
        /// <summary>  
        /// 提示信息  
        /// </summary>  
        public string _msg;

        /// <summary>  
        /// 客户端状态封装类  
        /// </summary>  
        public ClientInfo state;

        /// <summary>  
        /// 是否已经处理过了  
        /// </summary>  
       // public bool IsHandled { get; set; }

        public TCPMessageArgs(string msg)
        {
            this._msg = msg;
            //IsHandled = false;
        }
        public TCPMessageArgs(ClientInfo state)
        {
            this.state = state;
            // IsHandled = false;
        }
        public TCPMessageArgs(string msg, ClientInfo state)
        {
            this._msg = msg;
            this.state = state;
            //IsHandled = false;
        }
    }
}

4）服务端存储所有客户端类

通过

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;

namespace TcpSocketServer
{
    
    /// <summary>
    /// 客户端信息
    /// </summary>
    public class ClientInfo
    {
        #region 字段 

        public int _recvdBufferLength;//接收到的数据长度

        private byte[] _recvBuffer;// 接收数据缓冲区  

        private string _datagram;// 客户端发送到服务器的报文 
  
        private Socket _clientSock;// 客户端的Socket

        private string tempMsg = string.Empty;

        #endregion

        #region 属性  

        /// <summary>  
        /// 接收数据缓冲区   
        /// </summary>  
        public byte[] RecvDataBuffer
        {
            get
            {
                return _recvBuffer;
            }
            set
            {
                _recvBuffer = value;
            }
        }

        /// <summary>  
        /// 存取会话的报文  
        /// </summary>  
        public string Datagram
        {
            get
            {
                _datagram = Encoding.Default.GetString(_recvBuffer, 0, _recvdBufferLength);
                return _datagram;
            }
        }

        public List<MsgProtocol> MsgList
        {
            get
            {
                _datagram = Encoding.Default.GetString(_recvBuffer, 0, _recvdBufferLength);
                return HandlerRecvdString(_datagram);
            }
        }


        /// <summary>  
        /// 获得与客户端会话关联的Socket对象  
        /// </summary>  
        public Socket ClientSocket
        {
            get
            {
                return _clientSock;
            }
        }

        #endregion

        public ClientInfo(Socket clientSocket)
        {
            _clientSock = clientSocket;
        }

 
        public void Close()
        {
            //关闭数据的接受和发送  
            _clientSock.Shutdown(SocketShutdown.Both);

            //清理资源  
            _clientSock.Close();
        }

        public List<MsgProtocol> HandlerRecvdString(string msg)
        {
            List<MsgProtocol> msgProList = new List<MsgProtocol>();
            if (!String.IsNullOrEmpty(tempMsg))
            {
                msg = tempMsg + msg;
            }
            string pattern = "(^<protocol>.*?</protocol>)";
            if (Regex.IsMatch(msg, pattern))
            {
                //匹配协议内容
                string message = Regex.Match(msg, pattern).Groups[0].Value;
                //将匹配的内容添加到集合
                msgProList.Add(HandleMsg(message));
                tempMsg = string.Empty;
                //截取未匹配字符串，进行下一次匹配
                msg = msg.Substring(message.Length);
                if (!String.IsNullOrEmpty(msg))
                {
                    msgProList.AddRange(HandlerRecvdString(msg));
                }
            }
            else
            {
                tempMsg = msg;
            }
            return msgProList;
        }

        private MsgProtocol HandleMsg(string msg)
        {
            MsgProtocol msgProtocol = new TcpSocketServer.MsgProtocol();

            XmlDocument xml = new XmlDocument();
            xml.LoadXml(msg);
            XmlNode node = xml.DocumentElement;
            XmlNode message = node.FirstChild;// xml.SelectSingleNode("message");

            if(message.Attributes["type"].Value==MsgType.TEXT.ToString())
            {
                TextProtocol text = new TcpSocketServer.TextProtocol(message.Attributes["content"].Value);
                msgProtocol.type = MsgType.TEXT;
                msgProtocol.textProtocol = text;
            }
            else
            {
                FileProtocol file = new TcpSocketServer.FileProtocol(message.Attributes["content"].Value, message.Attributes["file"].Value);
                msgProtocol.type = MsgType.FILE;
                msgProtocol.fileProtocol = file;
            }

            return msgProtocol;
        }

    }
}

5）消息协议

处理每次消息发送时粘包问题

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace TcpSocketServer
{
    public enum MsgType
    {
        UNKNOWN = 0,
        TEXT = 1,
        FILE = 2
    }

    public class TextProtocol
    {
        public string content;

        private MsgType type=MsgType.TEXT;

        public TextProtocol(string content)
        {
            this.content = content;
        }

        //public byte[] ToBytes()
        //{
        //    string msgPackage = ToString();
        //    return Encoding.Default.GetBytes(msgPackage);
        //}

        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("<message ");
            sb.Append(string.Format("type="{0}"", type.ToString()));
            sb.Append(string.Format(" content="{0}"", content));
            sb.Append("/>");

            return sb.ToString();
        }
    }

    public class FileProtocol
    {
        public string filePath;

        public string content;

        private string fileName;

        private MsgType type = MsgType.FILE;

        public FileProtocol(string content,string filePath)
        {
            this.filePath = filePath;
            this.content = content;
        }

        public FileProtocol(string filePath)
        {
            this.filePath = filePath;
        }

        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("<message ");
            sb.Append(string.Format("type="{0}"", type.ToString()));
            sb.Append(string.Format(" file="{0}"", GetFileName()));
            sb.Append(string.Format(" content="{0}"", GetFileContent()));
            sb.Append("/>");

            return sb.ToString();
        }

        public byte[] ToBytes()
        {
            return Encoding.Default.GetBytes(content);
        }

        private string GetFileName()
        {
            if(File.Exists(filePath))
            {
                return Path.GetFileName(filePath);
            }
            else
            {
                return "";
            }
        }

        private string GetFileContent()
        {
            if(File.Exists(filePath))
            {
                byte[] bytes = File.ReadAllBytes(filePath);
                content = Encoding.Default.GetString(bytes);
            }
  
            return content;
        }
    }

    public class MsgProtocol
    {
        //公共字段
        //public string fileName;
        public MsgType type = MsgType.UNKNOWN;

        public TextProtocol textProtocol;

        public FileProtocol fileProtocol;

        public MsgProtocol()
        {

        }

        public MsgProtocol(TextProtocol textProtocol)
        {
            this.type = MsgType.TEXT;
            this.textProtocol = textProtocol;
        } 
        
        public MsgProtocol(FileProtocol fileProtocol)
        {
            this.type = MsgType.FILE;
            this.fileProtocol = fileProtocol;
        }

        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("<protocol>");

            if(type==MsgType.TEXT)
            {
                sb.Append(textProtocol.ToString());
            }
            else
            {
                sb.Append(fileProtocol.ToString());
            }

            sb.Append("</protocol>");

            return sb.ToString();
        }

        public byte[] ToBytes()
        {
            return Encoding.Default.GetBytes(this.ToString());
        }

        //public MsgProtocol(string filePath,MsgType type)
        //{
        //    type = MsgType.FILE;
        //    this.fileName = fileName;
        //    this.file
        //}      
    }
}

6）主程序应用

1、服务端

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TcpSocketServer
{
    class Program
    {
        private static TCPServerAsync tcpServer;

        static void Main(string[] args)
        {
            tcpServer = new TcpSocketServer.TCPServerAsync(8899);

            tcpServer.DataReceived += new EventHandler<TcpSocketServer.TCPMessageArgs>(OnDataReceived);
            tcpServer.ClientConnected += new EventHandler<TcpSocketServer.TCPMessageArgs>(OnClientConnected);
            tcpServer.ClientDisconnected += new EventHandler<TcpSocketServer.TCPMessageArgs>(OnClientDisconnected);

            tcpServer.Start();
            Console.ReadKey();        
        }

        public static void OnDataReceived(object obj,TCPMessageArgs message)
        {
            ClientInfo state = message.state;
            string sendData = "Server ";

            //byte[] data = state.RecvDataBuffer;
            //string strData = Encoding.Default.GetString(data);

            //Console.WriteLine(message.state.Datagram);


            #region 协议功能测试
            List<MsgProtocol> msgList = state.MsgList;

            foreach (MsgProtocol msgProtocol in msgList)
            {
                if (msgProtocol.type == MsgType.TEXT)
                {
                    Console.WriteLine(msgProtocol.textProtocol.content);
                    sendData += msgProtocol.textProtocol.content;
                }
                else
                {
                    Console.WriteLine(msgProtocol.fileProtocol.filePath);
                    sendData += msgProtocol.fileProtocol.filePath;
                }

            }
            #endregion

            if (message.state.Datagram=="close")
            {
                tcpServer.Close(message.state);
                return;
            }

            //数据处理后发送回客户端
            //string sendData = "Server " + message.state.Datagram;
            //byte[] sendBytes = Encoding.Default.GetBytes(sendData);
            //tcpServer.Send(state, sendBytes);

            #region 协议功能测试      
            MsgProtocol protocol = new TcpSocketServer.MsgProtocol(new TcpSocketServer.TextProtocol(sendData));
            tcpServer.Send(state, protocol.ToBytes());
            #endregion
        }

        public static void OnClientConnected(object obj, TCPMessageArgs message)
        {
            Console.WriteLine("Connect:" + message.state.ClientSocket.RemoteEndPoint.ToString());
        }
        public static void OnClientDisconnected(object obj, TCPMessageArgs message)
        {
            Console.WriteLine("Disconnect:" + message.state.ClientSocket.RemoteEndPoint.ToString());
            tcpServer.Close(message.state);
        }
    }
}

2、客户端调用

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

namespace TcpSocketClient
{
    class Program
    {
        private static TCPClientAsync tcpclient;
        private static bool b_Connecting = true;

        static void Main(string[] args)
        {
            IPAddress ip = IPAddress.Parse("192.168.8.15");
            tcpclient = new TcpSocketClient.TCPClientAsync(ip, 8899);
            tcpclient.ConnectAccepted += new EventHandler<TcpSocketClient.TCPMessageArgs>(OnConnected);
            tcpclient.DataReceived += new EventHandler<TcpSocketClient.TCPMessageArgs>(OnReceived);
            tcpclient.ServerCloseLink += new EventHandler<TCPMessageArgs>(OnDisConnected);
            tcpclient.Connect();

            while(b_Connecting)
            {
                string msg = Console.ReadLine();
                if(msg=="exit")
                {
                    tcpclient.Close();
                    //b_Connecting = false;
                    break;
                }

                if(msg=="close")
                {
                    //tcpclient.IsConnected = false;
                }

                //byte[] data = Encoding.Default.GetBytes(msg);
                //tcpclient.Send(data);
                //tcpclient.Receive();

                MsgProtocol msgProtocol = new TcpSocketClient.MsgProtocol(new TcpSocketClient.TextProtocol(msg));

                tcpclient.Send(msgProtocol.ToBytes());
            }            
        }

        public static void OnConnected(object obj,TCPMessageArgs msg)
        {
            Console.WriteLine("Connected.......");
            tcpclient.Receive();
        }

        public static void OnReceived(object obj, TCPMessageArgs msg)
        {
            //Console.WriteLine("Receivedd "+msg.state.Datagram);
            List<MsgProtocol> msgList = msg.state.MsgList;

            foreach(MsgProtocol msgProtocol in msgList)
            {
                if(msgProtocol.type==MsgType.TEXT)
                {
                    Console.WriteLine(msgProtocol.textProtocol.content);
                }
                else
                {
                    Console.WriteLine(msgProtocol.fileProtocol.filePath);
                }
                
            }
        }

        public static void OnDisConnected(object obj,TCPMessageArgs msg)
        {
            Console.WriteLine("Server Disconnected");
        }
    }
}

PS：未作客户端短线重连