数字索引分页

效果： 

共1页 首页 上一页 1 2 3 4 5 6 7 8 9 10 ....下一页 末页 

调用页面（Aspx）：
1.在要显示分页导航的地方加个DIV标签：

<div id="PageInfo" runat="server" class="Blue_Font12"></div>

 
2.调用页的代码（CS）：

DataList1.DataSource = ds.Tables[0].DefaultView;

DataList1.DataBind();

this.PageInfo.InnerHtml = PageNums.GetPageNum(ds,DataList1,12); //传入DataSet,DataList名称和分页大小

3.PageNums实现分页类（PageNums.cs）：

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

/// <summary>

///PageNums 的摘要说明

/// </summary>

public class PageNums

{

    /// </summary>

    /// <param name="ds">DataSet实例</param>

    /// <param name="datalistname">DataList名称</param>

    /// <param name="pagesize">分页大小</param>

    public static string GetPageNum(DataSet ds, DataList datalistname, int pagesize)

    {

        PagedDataSource objPds = new PagedDataSource();

        objPds.DataSource = ds.Tables[0].DefaultView;

        objPds.AllowPaging = true;

        int total = ds.Tables[0].Rows.Count;

        objPds.PageSize = pagesize;

        int page;

        if (HttpContext.Current.Request.QueryString["page"] != null)

            page = Convert.ToInt32(HttpContext.Current.Request.QueryString["page"]);

        else

            page = 1;

        objPds.CurrentPageIndex = page - 1;

        datalistname.DataSource = objPds;

        datalistname.DataBind();

        int allpage = 0;

        int next = 0;

        int pre = 0;

        int startcount = 0;

        int endcount = 0;

        string pagestr = "";

        if (page < 1) { page = 1; }

        //计算总页数

        if (pagesize != 0)

        {

            allpage = (total / pagesize);

            allpage = ((total % pagesize) != 0 ? allpage + 1 : allpage);

            allpage = (allpage == 0 ? 1 : allpage);

        }

        next = page + 1;

        pre = page - 1;

        startcount = (page + 5) > allpage ? allpage - 9 : page - 4;//中间页起始序号

        //中间页终止序号

        endcount = page < 5 ? 10 : page + 5;

        if (startcount < 1) { startcount = 1; } //为了避免输出的时候产生负数，设置如果小于1就从序号1开始

        if (allpage < endcount) { endcount = allpage; } //页码+5的可能性就会产生最终输出序号大于总页码，那么就要将其控制在页码数之内

        pagestr = "共" + allpage + "页      ";

        pagestr += page > 1 ? "<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1\">首页</a>  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + pre + "\">上一页</a>" : "首页 上一页";

       //中间页处理，这个增加时间复杂度，减小空间复杂度

        for (int i = startcount; i <= endcount; i++)

        {

            pagestr += page == i ? "  <font color=\"#ff0000\">" + i + "</font>" : "  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + i + "\">" + i + "</a>";

        }

        pagestr += page != allpage ? "  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + next + "\">下一页</a>  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + allpage + "\">末页</a>" : " 下一页 末页";

        return pagestr;

    }

}