仿GOOGLE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）： 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> 调用页的代码（CS）： DataSet ds = db.getDs(sql); this.PageInfo.InnerHtml = PageNums.GetPageNum(ds,DataList1,12); //传入DataSet,DataList名称和分页大小

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";

        pagestr += page > 1 ? "<a href=/"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1/">首页</a>&nbsp;&nbsp;<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 ? "&nbsp;&nbsp;<font color=/"#ff0000/">" + i + "</font>" : "&nbsp;&nbsp;<a href=/"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + i + "/">" + i + "</a>";
        }
        pagestr += page != allpage ? "&nbsp;&nbsp;<a href=/"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + next + "/">下一页</a>&nbsp;&nbsp;<a href=/"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + allpage + "/">末页</a>" : " 下一页 末页";

        return pagestr;

    }
}