原创性声明
本文作者：小竹zz 本文地址http://blog.csdn.net/zhujunxxxxx/article/details/44258719 转载请注明出处
文章系列文件夹
C#网络编程系列文章(一)之Socket实现异步TCPserver
C#网络编程系列文章(二)之Socket实现同步TCPserver
C#网络编程系列文章(三)之TcpListener实现异步TCPserver
C#网络编程系列文章(四)之TcpListener实现同步TCPserver
C#网络编程系列文章(五)之Socket实现异步UDPserver
C#网络编程系列文章(六)之Socket实现同步UDPserver
C#网络编程系列文章(七)之UdpClient实现异步UDPserver
C#网络编程系列文章(八)之UdpClient实现同步UDPserver
代码下载地址
http://download.csdn.net/detail/zhujunxxxxx/8510991
开篇
本人由于对于网络编程的喜爱，常常性的使用c#编写各类server(e.g TCPserver。UDPserver)。可是基本上都是搞着玩，网上也有非常多讲c#网络编程的文章，当然我也參考了非常多作者写的文章。看了这篇文章以后再也不用导出找资料了。
本系列文章会依次介绍使用Socket实现的异步TCPserver、同步TCPserver、异步UDPserver、同步UDPserver and 使用TcpListener和UdpClient实现的异步TCPserver、同步TCPserver、异步UDPserver、同步UDPserver。
Socket异步TCPserver
相信搞过网络编程的人来说这个TCP一点也不陌生吧，在C#中微软已经帮我们封装过了一个TcpListener和TcpClient这两个类了。实现了对于套接字的封装，可是呢实际上还是不怎么好用。所以我们用Socket来实现一个异步的TCPserver。
在本文中我仅仅给出server端代码。client代码自己能够找找别处，毕竟我仅仅是为了写出一个好的server端
以下是代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;
namespace NetFrame.Net.TCP.Sock.Asynchronous
{
/// <summary>
/// Socket实现的异步TCP服务器
/// </summary>
public class AsyncSocketTCPServer : IDisposable
{
#region Fields
/// <summary>
/// 服务器程序同意的最大客户端连接数
/// </summary>
private int _maxClient;
/// <summary>
/// 当前的连接的客户端数
/// </summary>
private int _clientCount;
/// <summary>
/// 服务器使用的异步socket
/// </summary>
private Socket _serverSock;
/// <summary>
/// 客户端会话列表
/// </summary>
private List<AsyncSocketState> _clients;
private bool disposed = false;
#endregion
#region Properties
/// <summary>
/// 服务器是否正在执行
/// </summary>
public bool IsRunning { get; private set; }
/// <summary>
/// 监听的IP地址
/// </summary>
public IPAddress Address { get; private set; }
/// <summary>
/// 监听的port
/// </summary>
public int Port { get; private set; }
/// <summary>
/// 通信使用的编码
/// </summary>
public Encoding Encoding { get; set; }
#endregion
#region 构造函数
/// <summary>
/// 异步Socket TCP服务器
/// </summary>
/// <param name="listenPort">监听的port</param>
public AsyncSocketTCPServer(int listenPort)
: this(IPAddress.Any, listenPort,1024)
{
}
/// <summary>
/// 异步Socket TCP服务器
/// </summary>
/// <param name="localEP">监听的终结点</param>
public AsyncSocketTCPServer(IPEndPoint localEP)
: this(localEP.Address, localEP.Port,1024)
{
}
/// <summary>
/// 异步Socket TCP服务器
/// </summary>
/// <param name="localIPAddress">监听的IP地址</param>
/// <param name="listenPort">监听的port</param>
/// <param name="maxClient">最大客户端数量</param>
public AsyncSocketTCPServer(IPAddress localIPAddress, int listenPort,int maxClient)
{
this.Address = localIPAddress;
this.Port = listenPort;
this.Encoding = Encoding.Default;
_maxClient = maxClient;
_clients = new List<AsyncSocketState>();
_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">
/// 服务器所同意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 关闭对全部客户端的连接
}
}
/// <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同意的客户端数目
if (_clientCount >= _maxClient)
{
//C-TODO 触发事件
RaiseOtherException(null);
}
else
{
AsyncSocketState state = new AsyncSocketState(client);
lock (_clients)
{
_clients.Add(state);
_clientCount++;
RaiseClientConnected(state); //触发客户端连接事件
}
state.RecvDataBuffer = new byte[client.ReceiveBufferSize];
//開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)
{
AsyncSocketState state = (AsyncSocketState)ar.AsyncState;
Socket client = state.ClientSocket;
try
{
//假设两次開始了异步的接收,所以当客户端退出的时候
//会两次执行EndReceive
int recv = client.EndReceive(ar);
if (recv == 0)
{
//C- TODO 触发事件 (关闭客户端)
Close(state);
RaiseNetError(state);
return;
}
//TODO 处理已经读取的数据 ps:数据在state的RecvDataBuffer中
//C- TODO 触发数据接收事件
RaiseDataReceived(state);
}
catch (SocketException)
{
//C- TODO 异常处理
RaiseNetError(state);
}
finally
{
//继续接收来自来客户端的数据
client.BeginReceive(state.RecvDataBuffer, 0, state.RecvDataBuffer.Length, SocketFlags.None,
new AsyncCallback(HandleDataReceived), state);
}
}
}
/// <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(AsyncSocketState 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(null);
}
#endregion
#region 事件
/// <summary>
/// 与客户端的连接已建立事件
/// </summary>
public event EventHandler<AsyncSocketEventArgs> ClientConnected;
/// <summary>
/// 与客户端的连接已断开事件
/// </summary>
public event EventHandler<AsyncSocketEventArgs> ClientDisconnected;
/// <summary>
/// 触发客户端连接事件
/// </summary>
/// <param name="state"></param>
private void RaiseClientConnected(AsyncSocketState state)
{
if (ClientConnected != null)
{
ClientConnected(this, new AsyncSocketEventArgs(state));
}
}
/// <summary>
/// 触发客户端连接断开事件
/// </summary>
/// <param name="client"></param>
private void RaiseClientDisconnected(Socket client)
{
if (ClientDisconnected != null)
{
ClientDisconnected(this, new AsyncSocketEventArgs("连接断开"));
}
}
/// <summary>
/// 接收到数据事件
/// </summary>
public event EventHandler<AsyncSocketEventArgs> DataReceived;
private void RaiseDataReceived(AsyncSocketState state)
{
if (DataReceived != null)
{
DataReceived(this, new AsyncSocketEventArgs(state));
}
}
/// <summary>
/// 发送数据前的事件
/// </summary>
public event EventHandler<AsyncSocketEventArgs> PrepareSend;
/// <summary>
/// 触发发送数据前的事件
/// </summary>
/// <param name="state"></param>
private void RaisePrepareSend(AsyncSocketState state)
{
if (PrepareSend != null)
{
PrepareSend(this, new AsyncSocketEventArgs(state));
}
}
/// <summary>
/// 数据发送完成事件
/// </summary>
public event EventHandler<AsyncSocketEventArgs> CompletedSend;
/// <summary>
/// 触发数据发送完成的事件
/// </summary>
/// <param name="state"></param>
private void RaiseCompletedSend(AsyncSocketState state)
{
if (CompletedSend != null)
{
CompletedSend(this, new AsyncSocketEventArgs(state));
}
}
/// <summary>
/// 网络错误事件
/// </summary>
public event EventHandler<AsyncSocketEventArgs> NetError;
/// <summary>
/// 触发网络错误事件
/// </summary>
/// <param name="state"></param>
private void RaiseNetError(AsyncSocketState state)
{
if (NetError != null)
{
NetError(this, new AsyncSocketEventArgs(state));
}
}
/// <summary>
/// 异常事件
/// </summary>
public event EventHandler<AsyncSocketEventArgs> OtherException;
/// <summary>
/// 触发异常事件
/// </summary>
/// <param name="state"></param>
private void RaiseOtherException(AsyncSocketState state, string descrip)
{
if (OtherException != null)
{
OtherException(this, new AsyncSocketEventArgs(descrip, state));
}
}
private void RaiseOtherException(AsyncSocketState state)
{
RaiseOtherException(state, "");
}
#endregion
#region Close
/// <summary>
/// 关闭一个与客户端之间的会话
/// </summary>
/// <param name="state">须要关闭的客户端会话对象</param>
public void Close(AsyncSocketState state)
{
if (state != null)
{
state.Datagram = null;
state.RecvDataBuffer = null;
_clients.Remove(state);
_clientCount--;
//TODO 触发关闭事件
state.Close();
}
}
/// <summary>
/// 关闭全部的客户端会话,与全部的客户端连接会断开
/// </summary>
public void CloseAllClient()
{
foreach (AsyncSocketState client in _clients)
{
Close(client);
}
_clientCount = 0;
_clients.Clear();
}
#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
}
}
事件參数类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace NetFrame.Net.TCP.Sock.Asynchronous
{
/// <summary>
/// 异步Socket TCP事件參数类
/// </summary>
public class AsyncSocketEventArgs:EventArgs
{
/// <summary>
/// 提示信息
/// </summary>
public string _msg;
/// <summary>
/// client状态封装类
/// </summary>
public AsyncSocketState _state;
/// <summary>
/// 是否已经处理过了
/// </summary>
public bool IsHandled { get; set; }
public AsyncSocketEventArgs(string msg)
{
this._msg = msg;
IsHandled = false;
}
public AsyncSocketEventArgs(AsyncSocketState state)
{
this._state = state;
IsHandled = false;
}
public AsyncSocketEventArgs(string msg, AsyncSocketState state)
{
this._msg = msg;
this._state = state;
IsHandled = false;
}
}
}
用户状态封装
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
namespace NetFrame.Net.TCP.Sock.Asynchronous
{
/// <summary>
/// 异步SOCKET TCP 中用来存储客户端状态信息的类
/// </summary>
public class AsyncSocketState
{
#region 字段
/// <summary>
/// 接收数据缓冲区
/// </summary>
private byte[] _recvBuffer;
/// <summary>
/// 客户端发送到server的报文
/// 注意:在有些情况下报文可能仅仅是报文的片断而不完整
/// </summary>
private string _datagram;
/// <summary>
/// 客户端的Socket
/// </summary>
private Socket _clientSock;
#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
{
return _datagram;
}
set
{
_datagram = value;
}
}
/// <summary>
/// 获得与客户端会话关联的Socket对象
/// </summary>
public Socket ClientSocket
{
get
{
return _clientSock;
}
}
#endregion
/// <summary>
/// 构造函数
/// </summary>
/// <param name="cliSock">会话使用的Socket连接</param>
public AsyncSocketState(Socket cliSock)
{
_clientSock = cliSock;
}
/// <summary>
/// 初始化数据缓冲区
/// </summary>
public void InitBuffer()
{
if (_recvBuffer == null&&_clientSock!=null)
{
_recvBuffer=new byte[_clientSock.ReceiveBufferSize];
}
}
/// <summary>
/// 关闭会话
/// </summary>
public void Close()
{
//关闭数据的接受和发送
_clientSock.Shutdown(SocketShutdown.Both);
//清理资源
_clientSock.Close();
}
}
}
本文作者：小竹zz 本文地址http://blog.csdn.net/zhujunxxxxx/article/details/44258719 转载请注明出处