public void AddFriend(string nickname) { Users user = Session["CurrentUser"] as Users; if (user == null) { throw new Exception("用户尚未登陆!"); } Messages msg = new Messages(); msg.Classify = 3; msg.Receiver = nickname; msg.SendTime = DateTime.Now; msg.Sender = user.Nickname; MessageManager mm = new MessageManager(); mm.AddFriend(msg); }