asp.net mvc 分页

    public static class htmlPager
    {
        public static string myPager(this System.Web.Mvc.HtmlHelper html,int totalPage,int currentPage,
             Func<int,string> actionUrls) {

            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            #region “前一页”
            TagBuilder tgPrev = new TagBuilder("a");
            tgPrev.InnerHtml = "前一页";

            if (currentPage!=1 && totalPage>1)
            {
                tgPrev.MergeAttribute("href", actionUrls(1));
            }
            sb.Append(tgPrev.ToString());
            #endregion
            
                if (totalPage <= 10)
                {
                    for (int i = 1; i <= totalPage; i++)
                    {
                        TagBuilder tg = new TagBuilder("a");
                        tg.MergeAttribute("href", actionUrls(i));
                        tg.InnerHtml = (i.ToString());

                        if (i == currentPage)
                        {
                            tg.AddCssClass("selected");
                        }
                        sb.Append(tg.ToString());
                    }
                }
                else {//大于10页
                    if (currentPage < 7)
                    {
                        for (int i = 1; i <= totalPage; i++)
                        {
                            TagBuilder tg = new TagBuilder("a");
                            if (i < 8)
                            {
                                tg.MergeAttribute("href", actionUrls(i));
                                tg.InnerHtml = (i.ToString());
                            }
                            else if (i == 8)
                                tg.InnerHtml = "……";
                            else {
                                if (i > (totalPage - 2)) {
                                    tg.MergeAttribute("href", actionUrls(i));
                                    tg.InnerHtml = (i.ToString());
                                }
                            }
                            if (i == currentPage)
                            {
                                tg.AddCssClass("selected");
                            }
                            if(tg.InnerHtml!="")
                            sb.Append(tg.ToString());
                        }
                    }
                    else if (currentPage >= 7) {
                        for (int i = 1; i <= totalPage; i++)
                        {
                            TagBuilder tg = new TagBuilder("a");
                            if (i < 3) {
                                tg.MergeAttribute("href", actionUrls(i));
                                tg.InnerHtml = (i.ToString());
                            }
                            if (i == 3) 
                                tg.InnerHtml = "……";
                            if ((totalPage - currentPage) > 6)
                            {
                                if ((totalPage - currentPage) > 5)
                                {
                                    if ((currentPage - i) <= 2 && (currentPage - i) >= -3)
                                    {
                                        tg.MergeAttribute("href", actionUrls(i));
                                        tg.InnerHtml = (i.ToString());
                                    }
                                    if ((currentPage - i) == -4)
                                        tg.InnerHtml = "……";
                                    if ((totalPage - i) <= 2)
                                    {
                                        tg.MergeAttribute("href", actionUrls(i));
                                        tg.InnerHtml = (i.ToString());
                                    }
                                }
                                else if ((currentPage - i) < 2)
                                {
                                    tg.MergeAttribute("href", actionUrls(i));
                                    tg.InnerHtml = (i.ToString());
                                }
                            }
                            else
                            {
                                if ((currentPage - i) < 2 || (totalPage-i)<7)
                                {
                                    tg.MergeAttribute("href", actionUrls(i));
                                    tg.InnerHtml = (i.ToString());
                                }
                            }
                            if (i == currentPage)
                                tg.AddCssClass("selected");
                            if (tg.InnerHtml != "")
                                sb.Append(tg.ToString());
                        }
                    }
                }
            
            #region “后一页”
            TagBuilder tgNext = new TagBuilder("a");
            tgNext.InnerHtml = "后一页";

            if (currentPage != totalPage && totalPage > 1)
            {
                tgNext.MergeAttribute("href", actionUrls(currentPage+1));
            }
            sb.Append(tgNext.ToString());
            #endregion

            #region 搜索
            TagBuilder tbTxt = new TagBuilder("input");
            tbTxt.MergeAttribute("value", currentPage.ToString());
            tbTxt.MergeAttribute("id", "_Ext_txtmyPageIndex");
            tbTxt.MergeAttribute("name", "_Ext_txtmyPageIndex");
            tbTxt.MergeAttribute("style","50px;");
            sb.Append(tbTxt.ToString());

            TagBuilder tbHidden_TotalPages = new TagBuilder("input");
            tbHidden_TotalPages.MergeAttribute("value", totalPage.ToString());
            tbHidden_TotalPages.MergeAttribute("id", "_Ext_txtmyTotalPage");
            tbHidden_TotalPages.MergeAttribute("name", "_Ext_txtmyTotalPage");
            tbHidden_TotalPages.MergeAttribute("type", "hidden");
            sb.Append(tbHidden_TotalPages.ToString());

            TagBuilder tbGo = new TagBuilder("input");
            tbGo.MergeAttribute("type","submit");
            tbGo.MergeAttribute("value","GO");
            sb.Append(tbGo.ToString());
            #endregion

            return sb.ToString();
        }
}

调用这个扩张方法

<div class="pager">
    <% using (Html.BeginForm())
       { %>
            <%= Html.myPager((int)ViewData["totalPage"],
                (int)ViewData["currentPage"], x => Url.Action("index", new { id = x })) %>
    <% } %>
    </div>
//表达式，也可以不用表达式。 
// Url.Action("index", new { id = x })返回 /{controller}/{action}/{id} 格式
// 用于告知提交的目的地

private readonly int pagesize = 5;
        public ActionResult Index(int? id,FormCollection form)
        {
            int Ind = 0;
            if (id == null )
                Ind = 1;
            else
            {
                string index = form.Get("_Ext_txtmyPageIndex");
                Ind = ((int)id) == -1 ? int.Parse(index) : (int)id;  // (int)id;   
            }

            NorthwindEntities ne = new NorthwindEntities();
            ViewData["currentPage"] = Ind;
            ViewData["totalPage"] =  (int)Math.Ceiling((double)ne.Products.Count() / pagesize);

            return View(ne.Products.OrderBy(f=>f.ProductID).Skip(pagesize*(Ind-1)).Take(pagesize));
        }

        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult Index(FormCollection form) {
                return RedirectToAction("index", new { id = form.Get("_Ext_txtmyPageIndex") });
        }

post是处理用户自定义页面索引