public ActionResult Index(string titleName, string nickName, int pageIndex = )

        {

            var data = from m in _db.AppArticleComment

                       join o in _db.AppArticle on m.ArticleId equals o.ArticleId

                       where (string.IsNullOrEmpty(nickName) ? true : m.NickName == nickName)//在此判断加条件，当变量值null需要转为整型时会抱异常

                       select new AppArticleCommentModel()

                       {

                           Id = m.Id,

                           OId = m.OId,

                           MId = m.MId,

                           NickName = m.NickName,

                           Comment = m.Comment,

                           Good = m.Good,

                           Created = m.Created,

                           IsHorizontal = m.IsHorizontal,

                           Version = m.Version,

                           From = m.From,

                           ArticleName = o.Title

                       };

            if (!string.IsNullOrEmpty(titleName))

            {

                //也可在此判断添追加条件

                data = data.Where(m => m.ArticleName.Contains(titleName));

            }

            int total = ;

            int pageSize = ;

            //对集合进行分页

            var query = data.OrderByDescending(m => m.Created)

                .Skip(pageSize * (pageIndex - )).Take(pageSize);

            var list = query.ToList();

            total = data.Count();

            PagingHelper<AppArticleCommentModel> dataPaging = new PagingHelper<AppArticleCommentModel>(, list);//初始化分页器

            dataPaging.PageIndex = pageIndex;//指定当前页

            dataPaging.PageCount = (int)Math.Ceiling(total / (double)pageSize);

            dataPaging.PageSize = pageSize;

            dataPaging.TotalCount = total;

            return View(dataPaging);//返回分页器实例到视图

        }