简单的分页控件（原创）

前台有个容器用来存放创建的HtmlAnchor 

生成的样式：首页 上一页 12345 下一页 末页

   /// <summary>
    /// 
    /// </summary>
    /// <param name="page">index first page is 0</param>
    /// <returns></returns>
    HtmlAnchor GetPageLink(int page)
    {
        HtmlAnchor a = new HtmlAnchor();
        if (page < 0 || page > ItemCount / PageSize) return null;
        //a.HRef = string.Format(Request.Path + (Request .QueryString .Count >0?string.Empty : "?")+"PageIndex={0}", page.ToString());
        a.HRef =ToUriWithUserDomain(string.Format ("/HealthPostList/{0}.aspx",page.ToString ()));
        a.InnerText = (page + 1).ToString();
        return a;
    }

    void PageLinks()
    {
        Dictionary<int, int[]> pageIDs = new Dictionary<int, int[]>();
        int pageCount = idList.Length / PageSize;
        for (int i = 0, c = pageCount; i <= c; i++)
        {
            var item = idList.Skip(i * PageSize).Take(PageSize).ToArray ();
            if (item.Length <= 0) continue;
            pageIDs.Add(i,item);
        }

        idList = pageIDs[PageIndex];

        //first page
        HtmlAnchor firstPage =GetPageLink (0);
        firstPage .InnerText ="首页";
        PageLinkList .Controls .Add (firstPage);
        HtmlAnchor prePage = GetPageLink((PageIndex - 1) < 0 ? 0 : (PageIndex - 1));
        prePage.InnerText = "上一页";
        PageLinkList.Controls.Add(prePage);

        int range = 2;
        int wholeRange = range * 2 + 1;
        if (wholeRange > pageCount)
        {
            wholeRange = pageCount;
            range = wholeRange / 2;
        }
        List<int> showPageIndex = new List<int>();
        showPageIndex.Add(PageIndex);

        while (showPageIndex.Count() < wholeRange)
        {
            showPageIndex.Add(showPageIndex.Max() + 1);
            showPageIndex.Add(showPageIndex.Min() - 1);
            if (PageIndex < range)
                showPageIndex.Add(showPageIndex.Max() + 1);
            if (PageIndex >= pageCount)
                showPageIndex.Add(showPageIndex.Min() - 1);

            showPageIndex = showPageIndex.OrderBy(item => item).ToList ();

            showPageIndex = showPageIndex.Where(item => item >=0 && item < pageCount).ToList();
            
        }

        //showPageIndex.OrderBy(item => item);

        foreach (int i in showPageIndex)
        {
            if(i==PageIndex )
            {
                HtmlGenericControl font = new HtmlGenericControl("font");
                font.Attributes.Add("style", "font-size:24px");
                font.Controls.Add(GetPageLink(PageIndex));
                PageLinkList.Controls.Add(font);
            }
            else
            PageLinkList.Controls.Add(GetPageLink(i));
        }

        HtmlAnchor nextPage = GetPageLink((PageIndex + 1) > (pageCount - 1) ? PageIndex : (PageIndex + 1));
        nextPage.InnerText = "下一页";
        PageLinkList.Controls.Add(nextPage);

        HtmlAnchor endPage = GetPageLink((pageCount - 1)<0?0:(pageCount -1));
        endPage.InnerText = "末页";
        PageLinkList.Controls.Add(endPage);
    }

   public partial class List : BaiChang .HeaBlog .Framework .HttpHandler .UserPage
    {
        private int PageIndex = 0;
        private int PageSize = 2;
        private int ItemCount =10;
        private int[] idList;
        Dictionary<int, int[]> pageIDs = new Dictionary<int, int[]>();
        protected void Page_Load(object sender, EventArgs e)
        {
            idList = EA.Posts.GetAllPostIDByUserID(base.BlogUser.UserID).Reverse().ToArray();
            ItemCount = idList.Length;
            PageIndex = -1;
            if (!IsPostBack)
            {
                if (Request.QueryString["PageIndex"] != null 
                    && 
                    int.TryParse(Request.QueryString["PageIndex"].ToString (), out PageIndex)) { }
                if (PageIndex < 0)
                    PageIndex = 0;
                PageLinks();
            }
            Array.ForEach<int>(pageIDs[PageIndex],
            it =>
            {
                System.Web.UI.Control c = Utils.LoadShowHealBlogControl(it);
                Content.Controls.Add(c);
            });
           
        }

        void PageLinks()
        {
            int pageCount = idList.Length / PageSize;
            for (int i = 0, c = pageCount; i <= c; i++)
            {
                var item = idList.Skip(i * PageSize).Take(PageSize).ToArray();
                if (item.Length <= 0) continue;
                pageIDs.Add(i, item);
            }

            idList = pageIDs[PageIndex];

            //first page
            HtmlAnchor firstPage = GetPageLink(0, true);
            firstPage.InnerText = "首页";
            PageLinkList.Controls.Add(firstPage);

            HtmlAnchor prePage = GetPageLink((PageIndex - 1) < 0 ? 0 : (PageIndex - 1), true);
            if (prePage != null)
            {
                prePage.InnerText = "上一页";
                PageLinkList.Controls.Add(prePage);
            }

            int range = 2;
            int wholeRange = range * 2 + 1;
            if (wholeRange > pageCount)
            {
                wholeRange = pageCount;
                range = wholeRange / 2;
            }
            List<int> showPageIndex = new List<int>();
            showPageIndex.Add(PageIndex);

            while (showPageIndex.Count() < wholeRange)
            {
                showPageIndex.Add(showPageIndex.Max() + 1);
                showPageIndex.Add(showPageIndex.Min() - 1);
                if (PageIndex < range)
                    showPageIndex.Add(showPageIndex.Max() + 1);
                if (PageIndex >= pageCount)
                    showPageIndex.Add(showPageIndex.Min() - 1);

                showPageIndex = showPageIndex.OrderBy(item => item).ToList();

                showPageIndex = showPageIndex.Where(item => item >= 0 && item < pageCount).ToList();

            }

            foreach (int i in showPageIndex)
            {
                if (i == PageIndex)
                {
                    HtmlGenericControl font = new HtmlGenericControl("font");
                    font.Attributes.Add("style", "font-size:24px");
                    System.Web.UI.Control c = GetPageLink(PageIndex, true);
                    if (c != null)
                        font.Controls.Add(c);
                    PageLinkList.Controls.Add(font);
                }
                else
                {
                    System.Web.UI.Control c = GetPageLink(i, true);
                    if (c != null)
                        PageLinkList.Controls.Add(c);
                }
            }

            HtmlAnchor nextPage = GetPageLink((PageIndex + 1) > (pageCount - 1) ? PageIndex : (PageIndex + 1), false);
            nextPage.InnerText = "下一页";
            PageLinkList.Controls.Add(nextPage);

            HtmlAnchor endPage = GetPageLink((pageCount - 1) < 0 ? 0 : (pageCount - 1), false);
            endPage.InnerText = "末页";
            PageLinkList.Controls.Add(endPage);

            TextBox tb = new TextBox();
            tb.ID = "txtPageIndex";
            tb.MaxLength = 3;
            PageLinkList.Controls.Add(tb);

            Button btn = new Button();
            btn.ID = "btnTo";
            btn.Text = "GO";
            btn.Click += new EventHandler(btn_Click);
            PageLinkList.Controls.Add(btn);
        }

        HtmlAnchor GetPageLink(int page, bool isCheckIgnore)
        {

            HtmlAnchor a = new HtmlAnchor();
            if (isCheckIgnore &&( page < 0 || page > ItemCount / PageSize)) return null;
            a.HRef = string.Format("{0}{1}/HealBlog/List/?PageIndex={2}", Utils.WebRoot, BlogUserDomain.Domain, page);
            //a.HRef = string.Format(Request.Path + (Request .QueryString .Count >0?string.Empty: "?")+"PageIndex={0}", page.ToString());
            a.InnerText = (page + 1).ToString();
            return a;
        }
        void btn_Click(object sender, EventArgs e)
        {
            TextBox tb = (TextBox)Page.FindControl("btnTo");
            if (tb != null)
            {
                int.TryParse(tb.Text, out PageIndex);
            }
           //在这里写跳转
        }

    }