C#網路編程系列文章(八)之UdpClient實現同步UDP伺服器

本文介紹

UdpClient 類在同步阻塞模式中為發送和接收不需連線的 UDP 資料包而提供了簡單的方法。因為 UDP 是一種不需連線的傳輸協議，所以你不需要在發送和接收資料之前建立任何遠程主機串連。你只需要按照下列方式來建立預設的遠程主機選項：
使用遠程主機名稱和連接埠號碼作為參數來建立 UdpClient 類的執行個體。
建立 UdpClient 類的執行個體然後調用 Connect 方法。
你可以使用任何由 UdpClient 所提供的發送方法把資料發送給遠程裝置。然後使用 Receive 方法來接收來自於遠程主機的資料。
提示：如果你已經指定了一個預設的遠程主機，就不要使用主機名稱或者 IPEndPoint 來調用 Send 方法。如果你這樣做，那麼 UdpClient 將會拋出一個異常。

UdpClient 方法同樣允許你發送和接收多點傳送的資料包。而使用 JoinMulticastGroup 方法可以把 UdpClient 訂閱到多點傳送分組。也可以使用 DropMulticastGroup 方法把 UdpClient 從多點傳送分組的訂閱中取消。

本節介紹使用UdpClient實現一個同步的UDP伺服器

UdpClient同步UDP伺服器

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net.Sockets;using System.Net;using System.Threading;namespace NetFrame.Net.UDP.Listener.Synchronous{    /// <summary>    /// UdpClient 實現同步UDP伺服器    /// </summary>    public class UDPServer    {        #region Fields        /// <summary>        /// 伺服器程式允許的最大用戶端串連數        /// </summary>        private int _maxClient;        /// <summary>        /// 當前的串連的用戶端數        /// </summary>        //private int _clientCount;        /// <summary>        /// 伺服器使用的非同步UdpClient        /// </summary>        private UdpClient _server;        /// <summary>        /// 用戶端工作階段列表        /// </summary>        //private List<UDPState> _clients;        private bool disposed = false;        /// <summary>        /// 資料接受緩衝區        /// </summary>        private byte[] _recvBuffer;        #endregion        #region Properties        /// <summary>        /// 伺服器是否正在運行        /// </summary>        public bool IsRunning { get; private set; }        /// <summary>        /// 監聽的IP地址        /// </summary>        public IPAddress Address { get; private set; }        /// <summary>        /// 監聽的連接埠        /// </summary>        public int Port { get; private set; }        /// <summary>        /// 通訊使用的編碼        /// </summary>        public Encoding Encoding { get; set; }        #endregion        #region 建構函式        /// <summary>        /// 同步UdpClient UDP伺服器        /// </summary>        /// <param name="listenPort">監聽的連接埠</param>        public UDPServer(int listenPort)            : this(IPAddress.Any, listenPort,1024)        {        }        /// <summary>        /// 同步UdpClient UDP伺服器        /// </summary>        /// <param name="localEP">監聽的終結點</param>        public UDPServer(IPEndPoint localEP)            : this(localEP.Address, localEP.Port,1024)        {        }        /// <summary>        /// 同步UdpClient UDP伺服器        /// </summary>        /// <param name="localIPAddress">監聽的IP地址</param>        /// <param name="listenPort">監聽的連接埠</param>        /// <param name="maxClient">最大用戶端數量</param>        public UDPServer(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>        /// 啟動伺服器        /// </summary>        /// <returns>非同步TCP伺服器</returns>        public void Start()        {            if (!IsRunning)            {                IsRunning = true;                _server.EnableBroadcast = true;                new Thread(ReceiveData).Start();            }        }        /// <summary>        /// 停止伺服器        /// </summary>        public void Stop()        {            if (IsRunning)            {                IsRunning = false;                _server.Close();                //TODO 關閉對所有用戶端的串連            }        }        /// <summary>        /// 同步接收資料的方法        /// </summary>        /// <param name="ar"></param>        private void ReceiveData()        {            IPEndPoint remote = null;            while (true)            {                byte[] buffer = null;                try                {                    buffer = _server.Receive(ref remote);                }                catch (Exception)                {                    //異常處理操作                    return;                }                if (buffer == null || buffer.Length == 0) return;                //TODO 資料包收到觸發事件                RaiseDataReceived(null);            }        }        /// <summary>        /// 同步發送資料        /// </summary>        /// <param name="msg"></param>        /// <param name="remote"></param>        public void Send(string msg, IPEndPoint remote)        {            byte[] data = Encoding.Default.GetBytes(msg);            try            {                _server.Send(data, data.Length, remote);            }            catch (Exception)            {                //TODO 異常處理                RaiseOtherException(null);            }        }        #endregion        #region 事件        /// <summary>        /// 接收到資料事件        /// </summary>        public event EventHandler<UDPEventArgs> DataReceived;        private void RaiseDataReceived(UDPState state)        {            if (DataReceived != null)            {                DataReceived(this, new UDPEventArgs(state));            }        }        /// <summary>        /// 資料發送完畢事件        /// </summary>        public event EventHandler<UDPEventArgs> CompletedSend;        /// <summary>        /// 觸發資料發送完畢的事件        /// </summary>        /// <param name="state"></param>        private void RaiseCompletedSend(UDPState state)        {            if (CompletedSend != null)            {                CompletedSend(this, new UDPEventArgs(state));            }        }        /// <summary>        /// 網路錯誤事件        /// </summary>        public event EventHandler<UDPEventArgs> NetError;        /// <summary>        /// 觸發網路錯誤事件        /// </summary>        /// <param name="state"></param>        private void RaiseNetError(UDPState state)        {            if (NetError != null)            {                NetError(this, new UDPEventArgs(state));            }        }        /// <summary>        /// 例外狀況事件        /// </summary>        public event EventHandler<UDPEventArgs> OtherException;        /// <summary>        /// 觸發例外狀況事件        /// </summary>        /// <param name="state"></param>        private void RaiseOtherException(UDPState state, string descrip)        {            if (OtherException != null)            {                OtherException(this, new UDPEventArgs(descrip, state));            }        }        private void RaiseOtherException(UDPState state)        {            RaiseOtherException(state, "");        }        #endregion        #region Close        /// <summary>        /// 關閉一個與用戶端之間的會話        /// </summary>        /// <param name="state">需要關閉的用戶端工作階段對象</param>        public void Close(UDPState state)        {            if (state != null)            {                //_clients.Remove(state);                //_clientCount--;                //TODO 觸發關閉事件            }        }        /// <summary>        /// 關閉所有的用戶端工作階段,與所有的用戶端串連會斷開        /// </summary>        public void CloseAllClient()        {            //foreach (AsyncUDPSocketState client in _clients)            //{            //    Close(client);            //}            //_clientCount = 0;            //_clients.Clear();        }        #endregion        #region 釋放        /// <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    }}

使用者狀態封裝類

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net.Sockets;using System.Net;namespace NetFrame.Net.UDP.Listener.Synchronous{    public class UDPState    {        // 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);    }}

伺服器事件參數類

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace NetFrame.Net.UDP.Listener.Synchronous{    /// <summary>    /// UdpClient 同步UDP伺服器事件類別    /// </summary>    public class UDPEventArgs : EventArgs    {        /// <summary>        /// 提示資訊        /// </summary>        public string _msg;        /// <summary>        /// 用戶端狀態封裝類        /// </summary>        public UDPState _state;        /// <summary>        /// 是否已經處理過了        /// </summary>        public bool IsHandled { get; set; }        public UDPEventArgs(string msg)        {            this._msg = msg;            IsHandled = false;        }        public UDPEventArgs(UDPState state)        {            this._state = state;            IsHandled = false;        }        public UDPEventArgs(string msg, UDPState state)        {            this._msg = msg;            this._state = state;            IsHandled = false;        }    }}

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