分页

PageInfo.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace WebPageNew.HtmlPage
{
    public class PageInfo
    {
        /// <summary>
        /// 数据库中信息总条数
        /// </summary>
        public int TotalItems { get; set; }

        /// <summary>
        /// 每页条数
        /// </summary>
        public int ItemsPerPage { get; set; }
        /// <summary>
        /// 当前页
        /// </summary>
        public int CurrentPage { get; set; }

        /// <summary>
        /// 总页数
        /// </summary>
        public int TotalPages
        {
            get { return (int)Math.Ceiling((decimal)TotalItems / ItemsPerPage); }
        }
    }
}

Paging.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;

namespace WebPageNew.HtmlPage
{
    public class Paging
    {
        /// <summary>
        /// 最新完整分页。2013年5月5日更新，在学习老赵的UserControl中应用到。
        /// </summary>
        /// <param name="pageInfo"></param>
        /// <param name="PageUrl">当前页面的地址</param>
        /// <returns></returns>
        public string MyPage(PageInfo pageInfo, string PageUrl)
        {

            int Prev = pageInfo.CurrentPage - 1;
            int Next = pageInfo.CurrentPage + 1;
            StringBuilder result = new StringBuilder();
            //首页
            string strFirst = string.Empty;
            strFirst = "<a href='" + PageUrl + "?PageNumber=1 '>Frist</a>";
            result.Append(strFirst);
            //上一页
            string strPrev = string.Empty;
            if (Prev < 1)
                Prev = 1;
            strPrev = "<a href='" + PageUrl + "?PageNumber=" + Prev.ToString() + " '>Prev</a>";
            result.Append(strPrev);


            //页码
            int PageNumSize = 11;
            int StartPage = 1;
            string strPage = string.Empty;
            if (pageInfo.CurrentPage > 5)//如果当前页面大于5
            {
                StartPage = pageInfo.CurrentPage - 5;//页码开始的序号为：当前页 - 5
                PageNumSize = pageInfo.CurrentPage + 5;//页面的最后为：当前页 + 5
            }
            if (pageInfo.TotalPages <= 11)//如果总页数小于11，那么设置显示的总页数为：小于11的那个页码
                PageNumSize = pageInfo.TotalPages;

            if (PageNumSize > pageInfo.TotalPages)
                PageNumSize = pageInfo.TotalPages;
            //----
            int startPage = 1;
            int lastPage = 11;
            if (pageInfo.TotalPages <= 11)
            {
                startPage = 1;
                lastPage = pageInfo.TotalPages;
            }
            else
            {
                if (pageInfo.CurrentPage > 5)
                {
                    startPage = pageInfo.CurrentPage - 5;
                    lastPage = pageInfo.CurrentPage + 5;
                    if (lastPage > pageInfo.TotalPages)
                    {
                        startPage = pageInfo.TotalPages - 10;
                        lastPage = pageInfo.TotalPages;
                    }
                }
            }
            //页号----------------
            for (int i = startPage; i <= lastPage; i++)
            {
                if (i == pageInfo.CurrentPage)
                    strPage = "<a class=\"selected\" href=\"" + PageUrl + "\">" + i.ToString() + "</a>";
                else
                    strPage = "<a href='" + PageUrl + "?PageNumber=" + i.ToString() + "'>" + i.ToString() + "</a>";
                result.Append(strPage);
            }








            //下一页
            string strNext = string.Empty;
            if (Next > pageInfo.TotalPages)
                Next = pageInfo.TotalPages;
            strNext = "<a href='" + PageUrl + "?PageNumber=" + Next.ToString() + " '>Next</a>";
            result.Append(strNext);
            //末页
            string strLast = string.Empty;
            strLast = "<a href='" + PageUrl + "?PageNumber=" + pageInfo.TotalPages + " '>Last</a>";
            result.Append(strLast);

            return result.ToString();
        }
    }
}

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebPageNew.Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
       <style type="text/css">
        #head .title{ height:80px; background-color:#444444;}
        #Pageing A{ background-color:#008844;
                    border:1px solid White;
                    text-decoration:none; color:White;
                    padding: .1em .6em .2em .6em;}
        #Pageing A.selected{ background-color:#AA7700;}
        body
{
    font-size: .85em;
    font-family: "Trebuchet MS", Verdana, Helvetica, Sans-Serif;
    color: #232323;
    background-color: #fff;
}
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
       <asp:DataList ID="DataList1" runat="server">
            
        </asp:DataList>
     <div id="Pageing" style="padding-bottom:10px;">
        <%= str %>
    </div>
    </div>
    </form>
</body>
</html>

Default.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using WebPageNew.HtmlPage;

namespace WebPageNew
{
    public partial class Default : System.Web.UI.Page
    {
        protected string str = "";
        protected void Page_Load(object sender, EventArgs e)
        {
            //设置page信息
            string strPageNum = Request.QueryString["PageNumber"];
            if (string.IsNullOrEmpty(strPageNum))
                strPageNum = "1";

            #region 设置分页信息
            //数据库中获取消息总条数TotalItems
            //设置每页条数
            //设置当前页
            PageInfo pageinfo = new PageInfo
            {
                CurrentPage = Convert.ToInt32(strPageNum),
                ItemsPerPage = 11,
                TotalItems = 200
            };
            #endregion

            #region 数据绑定
            //根据pageinfo请求数据库数据，绑定到datalist
            //当前页 pageinfo.CurrentPage
            //每页数据条数 pageinfo.ItemPerPage
            //计算出取 n -- n+10条
            #endregion

            #region 输出page
            Paging p = new Paging();
            str = p.MyPage(pageinfo, "http://localhost:5867/Default.aspx");
            #endregion
        }
    }
}