一个分页页码控件

    public class PageList : CompositeControl
    {
        protected override HtmlTextWriterTag TagKey
        {
            get
            {
                return HtmlTextWriterTag.Span;
            }
        }
        public PageList(int pageIndex, int pageSize, int maxPageCount, int count): base()
        {   
            //page count
            int pageCount = count / pageSize;
            if (count % pageSize != 0) pageCount++;
            //reset pageIndex
            if(pageIndex <0)pageIndex =0;
            if(pageIndex >pageCount )pageIndex = pageCount ;
            //url
            string url = Favor.CurrentPage.Request.RawUrl;
            if (url.Contains("?")) url.Remove(url.LastIndexOf('?'));
            url += "?pageIndex=";
            //startIndex,endIndex
            int startIndex = 0, endIndex = 0;
            GetPageArea(ref startIndex, ref endIndex, pageIndex, pageSize, pageCount);

            List<Control> cs = new List<Control>();

            //head links
            if (startIndex != 0)
            {
                //<<
                HyperLink first = new HyperLink();
                first.NavigateUrl = url + "0";
                first.Text = "<<";
                cs.Add(first);
                //...
                HyperLink dotted = new HyperLink();
                dotted.Text = "...";
                dotted.NavigateUrl = url + (pageIndex - pageSize).ToString();
                cs.Add(dotted);
            }

            //middle links
            for (int i = startIndex; i <= endIndex; i++)
            {
                HyperLink lk = new HyperLink();
                lk.Text = (i + 1).ToString();
                lk.NavigateUrl = url + i.ToString();

                if (i == pageIndex) lk.CssClass = "selected";
                cs.Add(lk);
            }

            //tail links
            if (endIndex != 0)
            {
                //...
                HyperLink dotted = new HyperLink();
                dotted.Text = "...";
                dotted.NavigateUrl = url + (pageIndex + pageSize).ToString();
                cs.Add(dotted);
                //>>
                HyperLink end = new HyperLink();
                end.NavigateUrl = url + (pageCount - 1).ToString();
                end.Text = ">>";
                cs.Add(end);
            }
            foreach (Control c in cs)
            {
                Controls.Add(c);
            }
            
        }