//回调总入口点,根据客户端动作通知对应客户端执行对应的操作 private void MyEventHandler(object sender, ChatEventArgs e) { try { switch (e.MessageType) { case MessageType.UserLeave: m_Callback.UserLeave(e.User); break; case MessageType.SendMessage: m_Callback.ShowMessage(e.Message, e.User); break; } } catch { Leave(e.User); } }
/// <summary> /// 发送消息 /// </summary> /// <param name="message"></param> /// <param name="userFrom"></param> /// <param name="userTo"></param> public void SendMessage(string message, CommunicationUser userFrom, CommunicationUser userTo) { //给指定的用户发送消息 ChatEventArgs e = new ChatEventArgs(); e.MessageType = MessageType.UserLeave; e.User = userTo; e.Message = userFrom.UserName + ": " + message; //循环将在线的用户广播信息 var users = (m_CurrentOnLineUsers.Where((pair) => { return(pair.ToString() == userTo.ToString()); })).ToList(); users.ForEach((pair) => { pair.Value.GetInvocationList().ToList().ForEach((handler) => { ((CommunicationEventHandler)handler).BeginInvoke(this, e, null, null); }); }); }
/// <summary> /// 记录加入的客户端的用户,用于单点登录 /// </summary> /// <param name="name"></param> /// <returns></returns> void Join1(CommunicationUser user) { try { bool userAdded = false; lock (m_SyncObjForOnlyOneLoginUsers)//线程的同步性,同步访问多个线程的任何变量,利用lock(独占锁),确保数据访问的唯一性。 { //同一个用户、同一台电脑、同一个进程的重复请求不用处理 //if ((m_OnlyOneLoginUsers.Where((pair) => { return pair.Key.ToString() == user.ToString(); })).Count() > 0) return; if (m_OnlyOneLoginUsers.Keys.Contains(user)) { return; } //向已经登录的用户发送消息 //foreach (CommunicationUser key in m_OnlyOneLoginUsers.Keys) for (int i = m_OnlyOneLoginUsers.Count() - 1; i >= 0; i--) { CommunicationUser key = m_OnlyOneLoginUsers.Keys.ElementAt(i); //只能向以当前用户账号登录系统的用户发送消息 if (key.UserID == user.UserID && key.UserName == user.UserName && m_OnlyOneLoginUsers[key] != null) { //给其他用户发送需要退出系统的消息 ChatEventArgs e = new ChatEventArgs(); e.MessageType = MessageType.UserLeave; e.User = key; //循环将在线的用户广播信息 foreach (CommunicationEventHandler handler in m_OnlyOneLoginUsers[key].GetInvocationList()) { //异步方式调用多路广播委托的调用列表中的ChatEventHandler handler.BeginInvoke(this, e, null, null); } //发送完成后移除用户 m_OnlyOneLoginUsers.Remove(key); RemoveUserInDGV(key); } } //记录下当前登录的用户 //if ((m_OnlyOneLoginUsers.Where((pair) => { return pair.Key.ToString() == user.ToString(); })).Count() == 0) if (!m_OnlyOneLoginUsers.Keys.Contains(user)) { m_OnlyOneLoginUsers.Add(user, MyEventHandler); userAdded = true; AddUserInDGV(user); } } if (userAdded) { //获取当前操作客户端实例的通道给IChatCallback接口的实例callback,此通道是一个定义为IChatCallback类型的泛类型,通道的类型是事先服务契约协定好的双工机制。 m_Callback = OperationContext.Current.GetCallbackChannel <ICommunicationCallback>(); } } catch (Exception ex) { throw ex; } }