DataGrid分页技巧

WebForm1.aspx

< %@ Page  language ="c#"  EnableViewState  = "true"  Codebehind ="DataGridPaging.aspx.cs"
 AutoEventWireup ="false"  Inherits ="eMeng.Exam.DataGridPaging.DataGridPaging"  % >
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
< HTML >
     < HEAD >
         < meta  content ="Visual Basic 7.0"  name ="CODE_LANGUAGE" >
         < meta  content ="JavaScript"  name ="vs_defaultClientScript" >
         < meta  content ="http://schemas.microsoft.com/intellisense/ie5"  name ="vs_targetSchema" >
     </ HEAD >
     < body  MS_POSITIONING ="GridLayout" >
         < form  id ="Form1"  runat ="server" >
             < asp:datagrid  id ="MyDataGrid"  runat ="server"  AutoGenerateColumns ="False"  HorizontalAlign ="Center"
                AlternatingItemStyle-BackColor ="#eeeeee"  HeaderStyle-BackColor ="#aaaadd"  Font-Size ="8pt"  Font-Name ="Verdana"
                CellPadding ="3"  BorderWidth ="1px"  BorderColor ="Black"  OnPageIndexChanged ="MyDataGrid_Page"
                PagerStyle-HorizontalAlign ="Right"  PagerStyle-Mode ="NumericPages"  PageSize ="5"  AllowPaging ="True"
                Font-Names ="Verdana" >
                 < AlternatingItemStyle  BackColor ="#EEEEEE" ></ AlternatingItemStyle >
                 < HeaderStyle  Font-Bold ="True"  HorizontalAlign ="Center"  BackColor ="#AAAADD" ></ HeaderStyle >
                 < Columns >
                     < asp:BoundColumn  DataField ="Title"  HeaderText ="标题" >
                         < HeaderStyle  Width ="450px" ></ HeaderStyle >
                     </ asp:BoundColumn >
                     < asp:BoundColumn  DataField ="pubdate"  HeaderText ="发表日期"  DataFormatString ="{0:yyyy-MM-dd hh:mm:ss}" >
                         < HeaderStyle  Width ="70px" ></ HeaderStyle >
                     </ asp:BoundColumn >
                     < asp:ButtonColumn  Text ="选择"  CommandName ="Select" >
                         < HeaderStyle  Width ="30px" ></ HeaderStyle >
                     </ asp:ButtonColumn >
                 </ Columns >
                 < PagerStyle  HorizontalAlign ="Right"  PageButtonCount ="5"  Mode ="NumericPages" ></ PagerStyle >
             </ asp:datagrid >
             < p  style ="FONT-SIZE:9pt"  align ="center" >
                 < asp:label  id ="lblPageCount"  runat ="server" ></ asp:label > &nbsp;
                 < asp:label  id ="lblCurrentIndex"  runat ="server" ></ asp:label >
                 < asp:linkbutton  id ="btnFirst"  onclick ="PagerButtonClick"  runat ="server"  Font-Name ="verdana"  Font-size ="8pt"
                    ForeColor ="navy"  CommandArgument ="0" ></ asp:linkbutton > &nbsp;
                 < asp:linkbutton  id ="btnPrev"  onclick ="PagerButtonClick"  runat ="server"  Font-Name ="verdana"  Font-size ="8pt"
                    ForeColor ="navy"  CommandArgument ="prev" ></ asp:linkbutton > &nbsp;
                 < asp:linkbutton  id ="btnNext"  onclick ="PagerButtonClick"  runat ="server"  Font-Name ="verdana"  Font-size ="8pt"
                    ForeColor ="navy"  CommandArgument ="next" ></ asp:linkbutton > &nbsp;
                 < asp:linkbutton  id ="btnLast"  onclick ="PagerButtonClick"  runat ="server"  Font-Name ="verdana"  Font-size ="8pt"
                    ForeColor ="navy"  CommandArgument ="last" ></ asp:linkbutton >
             </ p >
         </ form >
     </ body >
</ HTML >

WebForm1.aspx.cs

using  System;
using  System.Collections;
using  System.ComponentModel;
using  System.Data;
using  System.Data.OleDb;
using  System.Drawing;
using  System.Web;
using  System.Web.SessionState;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.HtmlControls;

namespace  eMeng.Exam.DataGridPaging
{
    /**//// <summary>
    /// DataGridPaging 的摘要说明。
    /// </summary>
    public class DataGridPaging : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.DataGrid MyDataGrid;
        protected System.Web.UI.WebControls.Label lblPageCount;
        protected System.Web.UI.WebControls.Label lblCurrentIndex;
        protected System.Web.UI.WebControls.LinkButton btnFirst;
        protected System.Web.UI.WebControls.LinkButton btnPrev;
        protected System.Web.UI.WebControls.LinkButton btnNext;
        protected System.Web.UI.WebControls.LinkButton btnLast;
        private OleDbConnection cn = new OleDbConnection();

        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            btnFirst.Text = "最首页";
            btnPrev.Text = "前一页";
            btnNext.Text = "下一页";
            btnLast.Text = "最后页";
            OpenDatabase();
            ShowStats();                                                      
            BindGrid();
        }
        private void OpenDatabase()
        {
            cn.ConnectionString = @"Auto Translate=True;User ID=sa;Tag with column collation when possible=False;
                                    Data Source='192.168.0.99';Password=4703;Initial Catalog=pubs;Use Procedure for Prepare=1;
                                    Provider='SQLOLEDB.1';Persist Security Info=True;Workstation ID=DNB07;Use Encryption for Data=False;
                                    Packet Size=4096";

            cn.Open();
        }
        private void ShowStats()
        {
            lblCurrentIndex.Text = "第 " + (MyDataGrid.CurrentPageIndex + 1).ToString() + " 页";
            lblPageCount.Text = "总共 " + MyDataGrid.PageCount.ToString() + " 页";
            btnFirst.Enabled = !(MyDataGrid.CurrentPageIndex == 0);
            btnPrev.Enabled = (MyDataGrid.CurrentPageIndex > 0); 
            btnNext.Enabled = (MyDataGrid.CurrentPageIndex+1 < MyDataGrid.PageCount);
            btnLast.Enabled = (MyDataGrid.CurrentPageIndex+1 < MyDataGrid.PageCount);
        }

        public void PagerButtonClick(object sender, EventArgs e)
        {
            string arg = ((LinkButton)sender).CommandArgument.ToString();
            switch(arg)
            {
                case "next":
                    if (MyDataGrid.CurrentPageIndex < (MyDataGrid.PageCount - 1))
                    {
                        MyDataGrid.CurrentPageIndex += 1;
                    }
                    break;
                case "prev":
                    if (MyDataGrid.CurrentPageIndex > 0)
                    {
                        MyDataGrid.CurrentPageIndex -= 1;
                    }
                    break;
                case "last":
                    MyDataGrid.CurrentPageIndex = (MyDataGrid.PageCount - 1);
                    break;
                default:
                    MyDataGrid.CurrentPageIndex = System.Convert.ToInt32(arg);
                    break;
            }
            BindGrid();
            ShowStats();
        }
        public void BindGrid()
        {
            OleDbConnection myConnection = cn;
            DataSet ds  = new DataSet();
            OleDbDataAdapter adapter  = new OleDbDataAdapter("Select Title,pubdate from titles", myConnection);
            adapter.Fill(ds, "Document");
            MyDataGrid.DataSource = ds.Tables["Document"].DefaultView;
            MyDataGrid.DataBind();
            ShowStats();
        }
        public void MyDataGrid_Page(object sender, DataGridPageChangedEventArgs e)
        {
        //    int startIndex ;
        //    startIndex = MyDataGrid.CurrentPageIndex * MyDataGrid.PageSize;
            MyDataGrid.CurrentPageIndex = e.NewPageIndex;
            BindGrid();
            ShowStats();
        }

        Web Form Designer generated code#region Web Form Designer generated code
        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.MyDataGrid.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.MyDataGrid_ItemCommand);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void MyDataGrid_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        {
            if (e.CommandName == "Select")
            {
                Response.Write("Hello");
            }
        }
    }
}