public async Task <ActionResult <IEnumerable <CommentAggregationDTO> > > GetCommentsByPage(int articleId, int limit, int pageIndex)
        {
            List <Comment> comments = (await commentService.GetCommentsOnNotReplyAsyncByPageAsync(articleId, limit, pageIndex)).ToList();
            List <CommentAggregationDTO> commentsDTOs = new List <CommentAggregationDTO>();

            foreach (var item in comments)
            {
                CommentAggregationDTO commentAggregationDTO = new CommentAggregationDTO();//父元素
                User user = await userService.GetUserByIdAsync(item.UserId);

                CommentDTO commentDTO = await commentMapper.MapperToSingleDTOAsync(item, user);

                //递归查询子元素
                commentService.ClearRecursionComments();
                List <Comment>    commentsChildren    = commentService.GetCommentsByRecursion(item.CommentId);
                List <CommentDTO> commentChildrenDTOs = new List <CommentDTO>();//子集元素
                foreach (var that in commentsChildren)
                {
                    User userChildren = await userService.GetUserByIdAsync(that.UserId);

                    CommentDTO commentChildrenDTO = await commentMapper.MapperToSingleDTOAsync(that, userChildren);

                    commentChildrenDTO.TargetUserName = (userService.GetUserByIdAsync((Guid)that.TargetUserId)).Result.UserName;
                    commentChildrenDTOs.Add(commentChildrenDTO);
                }
                //汇总
                commentAggregationDTO.CommentChildren = commentChildrenDTOs.OrderBy(a => a.CommentDate).ToList();
                commentAggregationDTO.CommentParent   = commentDTO;
                commentsDTOs.Add(commentAggregationDTO);
            }
            //获取总数
            int count = (await commentService.GetCommentsOnNotReplyAsync(articleId)).Count();

            return(Ok(new { data = commentsDTOs, total = count }));
        }