public override string Insert(MessageModel mm)
        {
            string rtn = "";

            // 插入的信息字符数小于5
            if (mm.Message.Length < 15)
            {
                MessageExecutor me = new MessageExecutor();
                if (me.Insert(mm))
                {
                    rtn = "执行者:经理" + " 内容:" + mm.Message + " 时间:" + mm.PublishTime.ToString();
                }
            }
            // 否则让上级去执行
            else
            {
                rtn = "你所插入的Message不符合要求";
            }

            return(rtn);
        }
        public override string Insert(MessageModel mm)
        {
            string rtn = "";

            // 插入的信息字符数小于5
            if (mm.Message.Length < 10)
            {
                MessageExecutor me = new MessageExecutor();
                if (me.Insert(mm))
                {
                    rtn = "执行者:主管" + " 内容:" + mm.Message + " 时间:" + mm.PublishTime.ToString();
                }
            }
            // 否则让上级去执行
            else if (base.Executor != null)
            {
                rtn = Executor.Insert(mm);
            }

            return(rtn);
        }