MVC分页 页面上显示的是拼凑的字符串

MVC分页 页面上显示的是拼接的字符串
是建了一个htmlHelper的扩展类，里面拼接的

/// <summary>

        /// 分页

        /// </summary>

        /// <param name="helper"></param>

        /// <param name="id">分页id</param>

        /// <param name="currentPageIndex">当前页</param>

        /// <param name="pageSize">分页尺寸</param>

        /// <param name="recordCount">记录总数</param>

        /// <param name="htmlAttributes">分页头标签属性</param>

        /// <param name="className">分页样式</param>

        /// <param name="mode">分页模式</param>

        /// <returns></returns>

        public static string Pager(this HtmlHelper helper, string id, int currentPageIndex, int pageSize,

                                   int recordCount, object htmlAttributes, string className, PageMode mode)

        {

            TagBuilder builder = new TagBuilder("div");

            builder.IdAttributeDotReplacement = "_";

            builder.GenerateId(id);

            builder.AddCssClass(className);

            builder.MergeAttributes(new RouteValueDictionary(htmlAttributes));

            builder.InnerHtml = GetNormalPage(currentPageIndex, pageSize, recordCount, mode);

            return builder.ToString();

        }


/// <summary>

        /// 获取普通分页

        /// </summary>

        /// <param name="currentPageIndex"></param>

        /// <param name="pageSize"></param>

        /// <param name="recordCount"></param>

        /// <returns></returns>

        private static string GetNormalPage(int currentPageIndex, int pageSize, int recordCount, PageMode mode)

        {

            int pageCount = (recordCount % pageSize == 0 ? recordCount / pageSize : recordCount / pageSize + 1);

            StringBuilder url = new StringBuilder();

            url.Append(HttpContext.Current.Request.Url.AbsolutePath + "?page={0}");

            NameValueCollection collection = HttpContext.Current.Request.QueryString;

            string[] keys = collection.AllKeys;

            for (int i = 0; i < keys.Length; i++)

            {

                if (keys[i].ToLower() != "page")

                    url.AppendFormat("&{0}={1}", keys[i], collection[keys[i]]);

            }

            StringBuilder sb = new StringBuilder();

            sb.Append("<div class='col-sm-6'>");

            sb.Append("<div class='dataTables_info' id='sample-table-2_info'>");

            sb.AppendFormat("总共{0}条记录,共{1}页,当前第{2}页&nbsp;&nbsp;", recordCount, pageCount, currentPageIndex);

            sb.Append("</div></div>");

            sb.Append("<div class='col-sm-6'>");