分页逻辑

int pageIndex = 1;//当前页码
            int id = Convert.ToInt32(Request.QueryString["id"]);  //专题ＩＤ
            int totalCount = new articleOP().getArticleCountByClass(id); //专题内的文章数量
            int totlePage = totalCount / 1; //总页数

            if (totlePage == 0)
            {
                totlePage = 1;
            }

            if (Request.QueryString["page"] != null)
            {
                pageIndex = Convert.ToInt32(Request.QueryString["page"]);
            }
            this.dlArticleLList.DataSource = new articleOP().getArticleByClass(id, pageIndex);
            this.dlArticleLList.DataBind();

            this.lblCurrentPage.Text = pageIndex.ToString();
            this.lblTotalPage.Text = totlePage.ToString();
            this.lblTotalCount.Text = totalCount.ToString();

            if ((pageIndex - 1) * 1 + this.dlArticleLList.Items.Count < totalCount) //如果当前页的记录数加上前面所有页的记录数>总记录数，则禁用“下一页”
            {
                this.hpNext.Enabled = true;
            }
            else
            {
                this.hpNext.Enabled = false;
            }

            if (pageIndex <= 1)　//如果是第一页　，则禁用首页及上一页　
            {
                this.hpFirstPage.Enabled = false;
                this.hpPre.Enabled = false;
                this.hpNext.NavigateUrl = "~/article/class.aspx?id=" + id + "&page=" + (pageIndex + 1);
            }
            else
            {
                this.hpFirstPage.Enabled = true;
                this.hpPre.Enabled = true;
                this.hpFirstPage.NavigateUrl = "~/article/class.aspx?id=" + id + "&page=1";　//首页page = 1
                this.hpPre.NavigateUrl = "~/article/class.aspx?id=" + id + "&page=" + (pageIndex - 1); //上一页
                this.hpNext.NavigateUrl = "~/article/class.aspx?id=" + id + "&page=" + (pageIndex + 1);//下一页
                this.hpLast.NavigateUrl = "~/article/class.aspx?id=" + id + "&page=" + totlePage; //最后一页
            }