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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
文章系列目录
C#网络编程系列文章(一)之Socket实现异步TCP服务器
C#网络编程系列文章(二)之Socket实现同步TCP服务器
C#网络编程系列文章(三)之TcpListener实现异步TCP服务器
C#网络编程系列文章(四)之TcpListener实现同步TCP服务器
C#网络编程系列文章(五)之Socket实现异步UDP服务器
C#网络编程系列文章(六)之Socket实现同步UDP服务器
C#网络编程系列文章(七)之UdpClient实现异步UDP服务器
C#网络编程系列文章(八)之UdpClient实现同步UDP服务器
本文介绍
UdpClient 类在同步阻塞模式中为发送和接收无连接的 UDP 数据包而提供了简单的方法。因为 UDP 是一种无连接的传输协议,所以你不需要在发送和接收数据之前建立任何远程主机连接。你只需要按照下列方式来建立默认的远程主机选项:
使用远程主机名称和端口号作为参数来创建 UdpClient 类的实例。
创建 UdpClient 类的实例然后调用 Connect 方法。
你可以使用任何由 UdpClient 所提供的发送方法把数据发送给远程设备。然后使用 Receive 方法来接收来自于远程主机的数据。
提示:如果你已经指定了一个默认的远程主机,就不要使用主机名称或者 IPEndPoint 来调用 Send 方法。如果你这样做,那么 UdpClient 将会抛出一个异常。
UdpClient 方法同样允许你发送和接收多点传送的数据包。而使用 JoinMulticastGroup 方法可以把 UdpClient 订阅到多点传送分组。也可以使用 DropMulticastGroup 方法把 UdpClient 从多点传送分组的订阅中取消。
本节介绍使用UdpClient实现一个异步的高性能UDP服务器
UdpClient异步UDP服务器
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Net.Sockets;
- using System.Net;
- namespace NetFrame.Net.UDP.Listener.Asynchronous
- {
- /// <summary>
- /// UdpClient 实现异步UDP服务器
- /// </summary>
- public class AsyncUDPServer
- {
- #region Fields
- /// <summary>
- /// 服务器程序允许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UdpClient
- /// </summary>
- private UdpClient _server;
- /// <summary>
- /// 客户端会话列表
- /// </summary>
- //private List<AsyncUDPState> _clients;
- private bool disposed = false;
- /// <summary>
- /// 数据接受缓冲区
- /// </summary>
- private byte[] _recvBuffer;
- #endregion
- #region Properties
- /// <summary>
- /// 服务器是否正在运行
- /// </summary>
- public bool IsRunning { get; private set; }
- /// <summary>
- /// 监听的IP地址
- /// </summary>
- public IPAddress Address { get; private set; }
- /// <summary>
- /// 监听的端口
- /// </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UdpClient UDP服务器
- /// </summary>
- /// <param name="listenPort">监听的端口</param>
- public AsyncUDPServer(int listenPort)
- : this(IPAddress.Any, listenPort,1024)
- {
- }
- /// <summary>
- /// 异步UdpClient UDP服务器
- /// </summary>
- /// <param name="localEP">监听的终结点</param>
- public AsyncUDPServer(IPEndPoint localEP)
- : this(localEP.Address, localEP.Port,1024)
- {
- }
- /// <summary>
- /// 异步UdpClient UDP服务器
- /// </summary>
- /// <param name="localIPAddress">监听的IP地址</param>
- /// <param name="listenPort">监听的端口</param>
- /// <param name="maxClient">最大客户端数量</param>
- public AsyncUDPServer(IPAddress localIPAddress, int listenPort, int maxClient)
- {
- this.Address = localIPAddress;
- this.Port = listenPort;
- this.Encoding = Encoding.Default;
- _maxClient = maxClient;
- //_clients = new List<AsyncUDPSocketState>();
- _server = new UdpClient(new IPEndPoint(this.Address, this.Port));
- _recvBuffer=new byte[_server.Client.ReceiveBufferSize];
- }
- #endregion
- #region Method
- /// <summary>
- /// 启动服务器
- /// </summary>
- /// <returns>异步TCP服务器</returns>
- public void Start()
- {
- if (!IsRunning)
- {
- IsRunning = true;
- _server.EnableBroadcast = true;
- _server.BeginReceive(ReceiveDataAsync, null);
- }
- }
- /// <summary>
- /// 停止服务器
- /// </summary>
- public void Stop()
- {
- if (IsRunning)
- {
- IsRunning = false;
- _server.Close();
- //TODO 关闭对所有客户端的连接
- }
- }
- /// <summary>
- /// 接收数据的方法
- /// </summary>
- /// <param name="ar"></param>
- private void ReceiveDataAsync(IAsyncResult ar)
- {
- IPEndPoint remote=null;
- byte[] buffer = null;
- try
- {
- buffer = _server.EndReceive(ar, ref remote);
- //触发数据收到事件
- RaiseDataReceived(null);
- }
- catch (Exception)
- {
- //TODO 处理异常
- RaiseOtherException(null);
- }
- finally
- {
- if (IsRunning && _server != null)
- _server.BeginReceive(ReceiveDataAsync, null);
- }
- }
- /// <summary>
- /// 发送数据
- /// </summary>
- /// <param name="msg"></param>
- /// <param name="remote"></param>
- public void Send(string msg, IPEndPoint remote)
- {
- byte[] data = Encoding.Default.GetBytes(msg);
- try
- {
- RaisePrepareSend(null);
- _server.BeginSend(data, data.Length, new AsyncCallback(SendCallback), null);
- }
- catch (Exception)
- {
- //TODO 异常处理
- RaiseOtherException(null);
- }
- }
- private void SendCallback(IAsyncResult ar)
- {
- if (ar.IsCompleted)
- {
- try
- {
- _server.EndSend(ar);
- //消息发送完毕事件
- RaiseCompletedSend(null);
- }
- catch (Exception)
- {
- //TODO 数据发送失败事件
- RaiseOtherException(null);
- }
- }
- }
- #endregion
- #region 事件
- /// <summary>
- /// 接收到数据事件
- /// </summary>
- public event EventHandler<AsyncUDPEventArgs> DataReceived;
- private void RaiseDataReceived(AsyncUDPState state)
- {
- if (DataReceived != null)
- {
- DataReceived(this, new AsyncUDPEventArgs(state));
- }
- }
- /// <summary>
- /// 发送数据前的事件
- /// </summary>
- public event EventHandler<AsyncUDPEventArgs> PrepareSend;
- /// <summary>
- /// 触发发送数据前的事件
- /// </summary>
- /// <param name="state"></param>
- private void RaisePrepareSend(AsyncUDPState state)
- {
- if (PrepareSend != null)
- {
- PrepareSend(this, new AsyncUDPEventArgs(state));
- }
- }
- /// <summary>
- /// 数据发送完毕事件
- /// </summary>
- public event EventHandler<AsyncUDPEventArgs> CompletedSend;
- /// <summary>
- /// 触发数据发送完毕的事件
- /// </summary>
- /// <param name="state"></param>
- private void RaiseCompletedSend(AsyncUDPState state)
- {
- if (CompletedSend != null)
- {
- CompletedSend(this, new AsyncUDPEventArgs(state));
- }
- }
- /// <summary>
- /// 网络错误事件
- /// </summary>
- public event EventHandler<AsyncUDPEventArgs> NetError;
- /// <summary>
- /// 触发网络错误事件
- /// </summary>
- /// <param name="state"></param>
- private void RaiseNetError(AsyncUDPState state)
- {
- if (NetError != null)
- {
- NetError(this, new AsyncUDPEventArgs(state));
- }
- }
- /// <summary>
- /// 异常事件
- /// </summary>
- public event EventHandler<AsyncUDPEventArgs> OtherException;
- /// <summary>
- /// 触发异常事件
- /// </summary>
- /// <param name="state"></param>
- private void RaiseOtherException(AsyncUDPState state, string descrip)
- {
- if (OtherException != null)
- {
- OtherException(this, new AsyncUDPEventArgs(descrip, state));
- }
- }
- private void RaiseOtherException(AsyncUDPState state)
- {
- RaiseOtherException(state, "");
- }
- #endregion
- #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(AsyncUDPState state)
- {
- if (state != null)
- {
- //_clients.Remove(state);
- //_clientCount--;
- //TODO 触发关闭事件
- }
- }
- /// <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 (AsyncUDPSocketState 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 (_server != null)
- {
- _server = null;
- }
- }
- catch (SocketException)
- {
- //TODO
- RaiseOtherException(null);
- }
- }
- disposed = true;
- }
- }
- #endregion
- }
- }
客户端信息封装了类
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Net.Sockets;
- using System.Net;
- namespace NetFrame.Net.UDP.Listener.Asynchronous
- {
- public class AsyncUDPState
- {
- // Client socket.
- public UdpClient udpClient = null;
- // Size of receive buffer.
- public const int BufferSize = 1024;
- // Receive buffer.
- public byte[] buffer = new byte[BufferSize];
- // Received data string.
- public StringBuilder sb = new StringBuilder();
- public IPEndPoint remote = new IPEndPoint(IPAddress.Any, 0);
- }
- }
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- namespace NetFrame.Net.UDP.Listener.Asynchronous
- {
- /// <summary>
- /// UdpClient 异步UDP服务器事件参数类
- /// </summary>
- public class AsyncUDPEventArgs : EventArgs
- {
- /// <summary>
- /// 提示信息
- /// </summary>
- public string _msg;
- /// <summary>
- /// 客户端状态封装类
- /// </summary>
- public AsyncUDPState _state;
- /// <summary>
- /// 是否已经处理过了
- /// </summary>
- public bool IsHandled { get; set; }
- public AsyncUDPEventArgs(string msg)
- {
- this._msg = msg;
- IsHandled = false;
- }
- public AsyncUDPEventArgs(AsyncUDPState state)
- {
- this._state = state;
- IsHandled = false;
- }
- public AsyncUDPEventArgs(string msg, AsyncUDPState state)
- {
- this._msg = msg;
- this._state = state;
- IsHandled = false;
- }
- }
- }
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