HtmlHelper的扩展：		注意点：扩展方法必须是静态方法，所在的类必须是静态类，所在的命名空间改成System.Web.MVC则能省略页面中必须添加命名空间的约束。		//主要就是输出分页的超级链接的标签		//自定义分页Helper扩展		public static HtmlString ShowPageNavigate(this HtmlHelper htmlHelper, int currentPage, int pageSize, int totalCount)        {            var redirectTo = htmlHelper.ViewContext.RequestContext.HttpContext.Request.Url.AbsolutePath;            pageSize = pageSize == 0 ? 3 : pageSize;            var totalPages = Math.Max((totalCount + pageSize - 1) / pageSize, 1); //总页数            var output = new StringBuilder();            if (totalPages > 1)            {                //if (currentPage != 1)                {//处理首页连接                    output.AppendFormat("<a class=‘pageLink‘ href=http://www.mamicode.com/‘{0}?pageIndex=1&pageSize={1}‘>首页", redirectTo, pageSize);                }                if (currentPage > 1)                {//处理上一页的连接                    output.AppendFormat("<a class=‘pageLink‘ href=http://www.mamicode.com/‘{0}?pageIndex={1}&pageSize={2}‘>上一页", redirectTo, currentPage - 1, pageSize);                }                else                {                   // output.Append("<span class=‘pageLink‘>上一页</span>");                }                output.Append(" ");                int currint = 5;                for (int i = 0; i <= 10; i++)                {//一共最多显示10个页码，前面5个，后面5个                    if ((currentPage + i - currint) >= 1 && (currentPage + i - currint) <= totalPages)                    {                        if (currint == i)                        {//当前页处理                            //output.Append(string.Format("[{0}]", currentPage));                            output.AppendFormat("<a class=‘cpb‘ href=http://www.mamicode.com/‘{0}?pageIndex={1}&pageSize={2}‘>{3}", redirectTo, currentPage , pageSize, currentPage );                        }                        else                        {//一般页处理                            output.AppendFormat("<a class=‘pageLink‘ href=http://www.mamicode.com/‘{0}?pageIndex={1}&pageSize={2}‘>{3}", redirectTo, currentPage + i - currint, pageSize, currentPage + i - currint);                        }                    }                    output.Append(" ");                }                if (currentPage < totalPages)                {//处理下一页的链接                    output.AppendFormat("<a class=‘pageLink‘ href=http://www.mamicode.com/‘{0}?pageIndex={1}&pageSize={2}‘>下一页", redirectTo, currentPage + 1, pageSize);                }                else                {                    //output.Append("<span class=‘pageLink‘>下一页</span>");                }                output.Append(" ");                if (currentPage != totalPages)                {                    output.AppendFormat("<a class=‘pageLink‘ href=http://www.mamicode.com/‘{0}?pageIndex={1}&pageSize={2}‘>末页", redirectTo, totalPages, pageSize);                }                output.Append(" ");            }            output.AppendFormat("第{0}页 / 共{1}页", currentPage, totalPages);//这个统计加不加都行            return new HtmlString(output.ToString());        }