public async Task <ActionResult <object> > UpdateCommentById(int id, Comment comment)
        {
            bool user_state = false;
            bool modified   = false;

            if (CheckUserState() > 0)
            {
                user_state   = true;
                comment.time = DateTime.Now;
                modified     = dao.UpdateCommentById(id, comment);
            }
            Dictionary <string, object> result = new Dictionary <string, object>();

            result.Add("user_state", user_state);
            result.Add("modified", modified);
            return(result);
        }