/// <summary>
 /// 发送指令到客户端。
 /// </summary>
 /// <param name="data"></param>
 /// <param name="clientIP"></param>
 protected bool SendOrderToClient(Msg data, string clientIP)
 {
     if (!string.IsNullOrEmpty(clientIP) && (data != null) && (this.ports != null))
     {
         return this.SendData(data, clientIP, this.ports.HostOrder);
     }
     return false;
 }
        /// <summary>
        /// 接收客户端消息数据。
        /// </summary>
        /// <param name="data"></param>
        protected virtual void ReceiveClientData(Msg data)
        {
            if (data == null) return;
            this.RaiseChanged("监听:" + data.ToString());
            switch (data.Kind)
            {
                case MSGKind.ClientClose://学生机下线。
                    {
                        ClientClose cc = data as ClientClose;
                        if (cc != null)
                        {
                            StudentEx student = Program.STUDENTS[cc.StudentID];
                            if (student != null)
                            {
                                if ((student.Status & StudentControl.EnumStudentState.Online) == StudentControl.EnumStudentState.Online)
                                {
                                    student.Status &= ~StudentControl.EnumStudentState.Online;
                                }
                                student.Status |= StudentControl.EnumStudentState.Offline;
                                this.RaiseChanged(string.Format("学生机:({0}){1}[{2}] 关闭客户端!", student.MachineName, student.StudentName, student.IP));
                                this.OnUpdateControls(student);
                            }
                        }
                    }
                    break;
                case MSGKind.ReqLogin://请求登录。
                    {
                        ReqLogin req = data as ReqLogin;
                        if (req != null)
                        {
                            this.RaiseChanged(string.Format("学生机IP:{0},{1:HH-mm-ss} 请求登录!", req.UIP, req.Time));
                            RespLogin resp = new RespLogin();
                            resp.Method = this.sci.LoginMethod;
                            resp.Students = this.sci.ClassInfo.Students;
                            resp.Catalog = this.sci.CatalogInfo;
                            resp.Time = DateTime.Now;
                            resp.UID = this.userInfo.UserID;

                            bool result = this.SendOrderToClient(resp, req.UIP);
                            this.RaiseChanged(string.Format("学生机IP:{0},{1:HH-mm-ss} 请求登录,{2}!", req.UIP, req.Time, result ? "成功" : "失败"));
                        }
                    }
                    break;
                case MSGKind.Logining://开始登录。
                    {
                        StartLogin s = data as StartLogin;
                        if (s != null)
                        {
                            object o = STU_Login_Cache[s.UserAccount];
                            if (o == null)
                            {
                                STU_Login_Cache[s.UserAccount] = s.UserAccount;
                                this.VerifyLogin(s);
                            }
                            else
                            {
                                EndLogin end = new EndLogin();
                                end.UID = this.userInfo.UserID;
                                end.Time = DateTime.Now;
                                end.Result = false;
                                end.Error = string.Format("学生[{0}]正在登录中,请稍后...", s.UserAccount);
                                this.SendOrderToClient(end, s.UIP);
                            }
                        }
                    }
                    break;
            }
        }
 /// <summary>
 /// 发送消息。
 /// </summary>
 /// <param name="data"></param>
 /// <param name="clientIP"></param>
 /// <param name="port"></param>
 /// <returns></returns>
 public bool SendData(Msg data, string clientIP, int port)
 {
     lock (this)
     {
         bool result = false;
         if (!string.IsNullOrEmpty(clientIP) && (data != null))
         {
             IPEndPoint remote = new IPEndPoint(IPAddress.Parse(clientIP), port);
             byte[] buf = this.Serialize(data);
             using (UdpClient udp = new UdpClient())
             {
                 return udp.Send(buf, buf.Length, remote) > 0;
             }
         }
         return result;
     }
 }
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 /// <summary>
 /// 序列化消息。
 /// </summary>
 /// <param name="data"></param>
 /// <returns></returns>
 protected byte[] Serialize(Msg data)
 {
     lock (this)
     {
         byte[] buf = null;
         if (data != null)
         {
             using (MemoryStream ms = new MemoryStream())
             {
                 this.binaryFormatter.Serialize(ms, data);
                 buf = ms.ToArray();
             }
         }
         return buf;
     }
 }
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 /// <summary>
 /// 发送数据。
 /// </summary>
 /// <param name="netWorkStream"></param>
 /// <param name="data"></param>
 /// <param name="message"></param>
 protected virtual void SendData(NetworkStream netWorkStream, Msg data, string message)
 {
     if (netWorkStream != null && data != null)
     {
         byte[] buf = this.Serialize(data);
         if (buf != null && buf.Length > 0)
         {
             netWorkStream.Write(buf, 0, buf.Length);
             this.RaiseChanged(string.Format("{0}【{1}...】", data.Time, message));
         }
     }
 }
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 /// <summary>
 /// 用广播端口发送消息。
 /// </summary>
 /// <param name="data"></param>
 /// <param name="ip"></param>
 public bool SendBroadcastPortMSG(Msg data, string ip)
 {
     bool result = false;
     if (data != null && !string.IsNullOrEmpty(ip))
     {
         data.Time = DateTime.Now;
         result = this.hostListenService.SendData(data, ip, this.ports.HostBroadcast);
     }
     return result;
 }