首先创建一张表(要求ID自动编号)：create table redheadedfile(id int identity(1,1),filenames nvarchar(20),senduser nvarchar(20),primary key(id))然后我们写入50万条记录：declare @i intset @i=1while @i<=500000begininsert into redheadedfile(filenames,senduser) values('我的分页算法','陆俊铭')set @i=@i 1endGO用Microsoft Visual Studio .NET 2003创建一张WebForm网页(本人起名webform8.aspx)前台代码片段如下(webform8.aspx)：<%@ Page language="c#" Codebehind="WebForm8.aspx.cs" AutoEventWireup="false" Inherits="WebApplication6.WebForm8" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML><HEAD><title>WebForm8</title><meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR"><meta content="C#" name="CODE_LANGUAGE"><meta content="JavaScript" name="vs_defaultClientScript"><meta content="" name="vs_targetSchema"></HEAD><body MS_POSITIONING="GridLayout"><form id="Form1" method="post" runat="server"><asp:datalist id="datalist1" AlternatingItemStyle-BackColor="#f3f3f3" Width="100%" CellSpacing="0"CellPadding="0" Runat="server"><ItemTemplate><table width="100%" border="0" cellspacing="0" cellpadding="0"><tr><td width="30%" http://schemas.microsoft.com/intellisense/ie5
align="center"><%#DataBinder.Eval(Container.DataItem,"filenames")%></td><td width="30%"
align="center"><%#DataBinder.Eval(Container.DataItem,"senduser")%></td><td width="30%"
align="center"><%#DataBinder.Eval(Container.DataItem,"id")%></td></tr></table></ItemTemplate></asp:datalist><div align="center">共<asp:label id="LPageCount" Runat="server" ForeColor="#ff0000"></asp:label>页/共
<asp:label id="LRecordCount" Runat="server" ForeColor="#ff0000"></asp:label>记录<asp:linkbutton id="Fistpage" Runat="server"
CommandName="0">首页</asp:linkbutton> <asp:linkbutton id="Prevpage" Runat="server" CommandName="prev">
上一页</asp:linkbutton> <asp:linkbutton id="Nextpage" Runat="server"
CommandName="next">下一页</asp:linkbutton> <asp:linkbutton id="Lastpage" Runat="server"
CommandName="last">尾页</asp:linkbutton> 当前第<asp:label id="LCurrentPage" Runat="server"
ForeColor="#ff0000"></asp:label>页 跳页<asp:TextBox ID="gotoPage" Runat="server" Width="30px"
MaxLength="5" AutoPostBack="True"></asp:TextBox></div></form></body></HTML>后台代码片段如下(webform8.aspx.cs)using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Data.SqlClient;using System.Configuration;
namespace WebApplication6{/// <summary>/// WebForm8 的摘要说明。/// </summary>public class WebForm8 : System.Web.UI.Page{protected System.Web.UI.WebControls.LinkButton Fistpage;protected System.Web.UI.WebControls.LinkButton Prevpage;protected System.Web.UI.WebControls.LinkButton Nextpage;protected System.Web.UI.WebControls.LinkButton Lastpage;protected System.Web.UI.WebControls.DataList datalist1;protected System.Web.UI.WebControls.DropDownList mydroplist;protected System.Web.UI.WebControls.Label LPageCount;protected System.Web.UI.WebControls.Label LRecordCount;protected System.Web.UI.WebControls.Label LCurrentPage;protected System.Web.UI.WebControls.TextBox gotoPage;const int PageSize=20;//定义每页显示记录int PageCount,RecCount,CurrentPage,Pages,JumpPage;//定义几个保存分页参数变量private void Page_Load(object sender, System.EventArgs e){if(!IsPostBack){RecCount = Calc();//通过Calc()函数获取总记录数PageCount = RecCount/PageSize OverPage();//计算总页数（加上OverPage()函数防止有余数造成显示
数据不完整）
ViewState["PageCounts"] = RecCount/PageSize -
ModPage();//保存总页参数到ViewState（减去ModPage()函数防止SQL语句执行时溢出查询范围，可以用存储过程分页算法来理解这句）ViewState["PageIndex"] = 0;//保存一个为0的页面索引值到ViewStateViewState["JumpPages"] = PageCount;//保存PageCount到ViewState，跳页时判断用户输入数是否超出页
码范围//显示LPageCount、LRecordCount的状态LPageCount.Text = PageCount.ToString();LRecordCount.Text = RecCount.ToString();//判断跳页文本框失效if(RecCount <= 20)gotoPage.Enabled = false;TDataBind();//调用数据绑定函数TDataBind()进行数据绑定运算}}//计算余页public int OverPage(){int pages = 0;if(RecCount%PageSize != 0)pages = 1;elsepages = 0;return pages;}//计算余页，防止SQL语句执行时溢出查询范围public int ModPage(){int pages = 0;if(RecCount%PageSize == 0 && RecCount != 0)pages = 1;elsepages = 0;return pages;}/**计算总记录的静态函数*本人在这里使用静态函数的理由是：如果引用的是静态数据或静态函数，连接器会优化生成代码，去掉动态重定位项（对
海量数据表分页效果更明显）。*希望大家给予意见、如有不正确的地方望指正。*/public static int Calc(){int RecordCount = 0;SqlCommand MyCmd = new SqlCommand("select count(*) as co from redheadedfile",MyCon());SqlDataReader dr = MyCmd.ExecuteReader();if(dr.Read())RecordCount = Int32.Parse(dr["co"].ToString());MyCmd.Connection.Close();return RecordCount;}//数据库连接语句（从Web.Config中获取）public static SqlConnection MyCon(){SqlConnection MyConnection = new SqlConnection(ConfigurationSettings.AppSettings["DSN"]);MyConnection.Open();return MyConnection;}//对四个按钮（首页、上一页、下一页、尾页）返回的CommandName值进行操作private void Page_OnClick(object sender, CommandEventArgs e){CurrentPage = (int)ViewState["PageIndex"];//从ViewState中读取页码值保存到CurrentPage变量中进行参数运
算Pages = (int)ViewState["PageCounts"];//从ViewState中读取总页参数运算
string cmd = e.CommandName;switch(cmd)//筛选CommandName{case "next":CurrentPage ;break;case "prev":CurrentPage--;break;case "last":CurrentPage = Pages;break;default:CurrentPage = 0;break;}ViewState["PageIndex"] = CurrentPage;//将运算后的CurrentPage变量再次保存至ViewStateTDataBind();//调用数据绑定函数TDataBind()}
private void TDataBind(){CurrentPage = (int)ViewState["PageIndex"];//从ViewState中读取页码值保存到CurrentPage变量中进行按钮失
效运算Pages = (int)ViewState["PageCounts"];//从ViewState中读取总页参数进行按钮失效运算//判断四个按钮（首页、上一页、下一页、尾页）状态if (CurrentPage 1 > 1){Fistpage.Enabled = true;Prevpage.Enabled = true;}else{Fistpage.Enabled = false;Prevpage.Enabled = false;}if (CurrentPage == Pages){Nextpage.Enabled = false;Lastpage.Enabled = false;}else{Nextpage.Enabled = true;Lastpage.Enabled = true;}//数据绑定到DataList控件DataSet ds = new DataSet();//核心SQL语句，进行查询运算（决定了分页的效率:)）SqlDataAdapter MyAdapter = new SqlDataAdapter("Select Top " PageSize " * from redheadedfile where id
not in(select top " PageSize*CurrentPage " id from redheadedfile order by id asc) order by id asc",MyCon());MyAdapter.Fill(ds,"news");datalist1.DataSource = ds.Tables["news"].DefaultView;datalist1.DataBind();//显示Label控件LCurrentPaget和文本框控件gotoPage状态LCurrentPage.Text = (CurrentPage 1).ToString();gotoPage.Text = (CurrentPage 1).ToString();//释放SqlDataAdapterMyAdapter.Dispose();}
#region Web 窗体设计器生成的代码override protected void OnInit(EventArgs e){//// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。//InitializeComponent();base.OnInit(e);}/// <summary>/// 设计器支持所需的方法 - 不要使用代码编辑器修改/// 此方法的内容。/// </summary>private void InitializeComponent(){ this.Fistpage.Command = new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick);this.Prevpage.Command = new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick);this.Nextpage.Command = new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick);this.Lastpage.Command = new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick);this.gotoPage.TextChanged = new System.EventHandler(this.gotoPage_TextChanged);this.Load = new System.EventHandler(this.Page_Load);
}#endregion//跳页代码private void gotoPage_TextChanged(object sender, System.EventArgs e){try{JumpPage = (int)ViewState["JumpPages"];//从ViewState中读取可用页数值保存到JumpPage变量中//判断用户输入值是否超过可用页数范围值if(Int32.Parse(gotoPage.Text) > JumpPage || Int32.Parse(gotoPage.Text) <= 0)
Response.Write("<script>alert('页码范围越界！');location.href='WebForm8.aspx'</script>");else{int InputPage = Int32.Parse(gotoPage.Text.ToString()) - 1;//转换用户输入值保存在int型
InputPage变量中ViewState["PageIndex"] = InputPage;//写入InputPage值到ViewState["PageIndex"]中TDataBind();//调用数据绑定函数TDataBind()再次进行数据绑定运算}}//捕获由用户输入不正确数据类型时造成的异常catch(Exception exp){Response.Write("<script>alert('" exp.Message "');location.href='WebForm8.aspx'</script>");}}}}
