DataGrid提供了分頁功能,不過看上去功能有限,但是我們可以通過DataGrid的一些屬性來擷取狀態以及增加首頁、尾頁功能按鈕。這裡沒有使用DataGrid的自訂分頁功能,如果在速度效率不是很講究的情況下,由DataGrid自己管理分頁還是不錯的,付出的代價就是要把整個相關資料取出來後再刪選指定頁的資料。好處就是開發速度快,不需要寫分頁的預存程序。本文案例使用的是Sql Server中的Northwind資料庫。運行介面如下:
對於前台的顯示介面,我放了一個DataGrid;四個LinkButton導向按鈕;四個Literal來顯示紀錄狀態。
剩下的就是用表格定位。
這裡需要設定DataGrid的AllowPaging屬性為True,同時設定AllowCustomPaging屬性位false(預設為false),設定PagerStyle的Visible屬性為False,使前台不顯示。
HTML:
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<%@ Page language="c#" Codebehind="DataGridPaging.aspx.cs" AutoEventWireup="false" Inherits="ZZ.AspnetPaging.DataGridPaging" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>DataGridPaging</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="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<TABLE id="Table1" style="FONT-SIZE: 9pt" cellSpacing="1" cellPadding="1" width="450" align="center"
border="1">
<TR>
<TD>
<asp:datagrid id="DataGrid1" runat="server" AllowPaging="True" Width="100%" PageSize="5">
<HeaderStyle Font-Size="9pt"></HeaderStyle>
<FooterStyle Font-Size="9pt"></FooterStyle>
<PagerStyle Visible="False" Font-Size="9pt" Mode="NumericPages"></PagerStyle>
</asp:datagrid></TD>
</TR>
</TABLE>
<TABLE id="Table2" style="FONT-SIZE: 9pt" cellSpacing="1" cellPadding="1" width="450" align="center"
border="1">
<TR>
<TD style="WIDTH: 207px">
<asp:linkbutton id="LBtnFirst" runat="server" CommandName="First">首頁</asp:linkbutton>
<asp:linkbutton id="LBtnPrev" runat="server" CommandName="Prev">上一頁</asp:linkbutton>
<asp:linkbutton id="LBtnNext" runat="server" CommandName="Next">下一頁</asp:linkbutton>
<asp:linkbutton id="LBtnLast" runat="server" CommandName="Last">尾頁</asp:linkbutton>
</TD>
<TD>第
<asp:literal id="LtlPageIndex" runat="server"></asp:literal>頁 共
<asp:literal id="LtlPageCount" runat="server"></asp:literal>頁 每頁
<asp:literal id="LtlPageSize" runat="server"></asp:literal>條 共
<asp:literal id="LtlRecordCount" runat="server"></asp:literal>條
</TD>
</TR>
</TABLE>
</form>
</body>
</HTML>
.cs代碼:
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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 ZZ.AspnetPaging
{
public class DataGridPaging : System.Web.UI.Page
{
private static string connString = ConfigurationSettings.AppSettings["ConnString"];
private int recordCount;
private int pageCount;
protected System.Web.UI.WebControls.LinkButton LBtnFirst;
protected System.Web.UI.WebControls.LinkButton LBtnPrev;
protected System.Web.UI.WebControls.LinkButton LBtnNext;
protected System.Web.UI.WebControls.LinkButton LBtnLast;
protected System.Web.UI.WebControls.Literal LtlPageIndex;
protected System.Web.UI.WebControls.Literal LtlPageCount;
protected System.Web.UI.WebControls.Literal LtlPageSize;
protected System.Web.UI.WebControls.Literal LtlRecordCount;
protected System.Web.UI.WebControls.DataGrid DataGrid1;
private void Page_Load(object sender, System.EventArgs e)
{
if(!Page.IsPostBack)
{
DataGridDataBind();
}
}
//綁定資料
private void DataGridDataBind()
{
DataSet ds = GetCustomersData();
recordCount = ds.Tables[0].Rows.Count;
//擷取當前的頁數
pageCount = (int)Math.Ceiling( recordCount * 1.0 / PageSize);
//避免紀錄從有到無時,並且已經進行過反頁的情況下CurrentPageIndex > PageCount出錯
if(recordCount ==0)
{
this.DataGrid1.CurrentPageIndex = 0;
}
else if(this.DataGrid1.CurrentPageIndex >= pageCount)
{
this.DataGrid1.CurrentPageIndex = pageCount - 1;
}
this.DataGrid1.DataSource = ds;
this.DataGrid1.DataBind();
NavigationStateChange();
}
#region Web Form設計器產生的程式碼
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 該調用是 ASP.NET Web Form設計器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 設計器支援所需的方法 - 不要使用代碼編輯器修改
/// 此方法的內容。
/// </summary>
private void InitializeComponent()
{
this.LBtnFirst.Click += new System.EventHandler(this.LBtnNavigation_Click);
this.LBtnPrev.Click += new System.EventHandler(this.LBtnNavigation_Click);
this.LBtnNext.Click += new System.EventHandler(this.LBtnNavigation_Click);
this.LBtnLast.Click += new System.EventHandler(this.LBtnNavigation_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void LBtnNavigation_Click(object sender, System.EventArgs e)
{
LinkButton btn = (LinkButton)sender;
switch(btn.CommandName)
{
case "First":
PageIndex = 0;
break;
case "Prev"://if( PageIndex > 0 )
PageIndex = PageIndex - 1;
break;
case "Next"://if( PageIndex < PageCount -1)
PageIndex = PageIndex + 1;
break;
case "Last":
PageIndex = PageCount - 1;
break;
}
DataGridDataBind();
}
//資料繫結
public static DataSet GetCustomersData()
{
SqlConnection conn = new SqlConnection("server=.;database=northwind;uid=sa");
string sqlStr = "SELECT CustomerID, CompanyName,Address,Phone FROM Customers";
SqlCommand comm = new SqlCommand( sqlStr ,conn);
SqlDataAdapter dataAdapter = new SqlDataAdapter(comm);
DataSet ds = new DataSet();
dataAdapter.Fill(ds);
return ds;
}
/// <summary>
/// 控制導覽按鈕或數位狀態
/// </summary>
public void NavigationStateChange()
{
if( PageCount <= 1 )//( RecordCount <= PageSize )//小於等於一頁
{
this.LBtnFirst.Enabled = false;
this.LBtnPrev.Enabled = false;
this.LBtnNext.Enabled = false;
this.LBtnLast.Enabled = false;
}
else //有多頁
{
if( PageIndex == 0 )//當前為第一頁
{
this.LBtnFirst.Enabled = false;
this.LBtnPrev.Enabled = false;
this.LBtnNext.Enabled = true;
this.LBtnLast.Enabled = true;
}
else if( PageIndex == PageCount - 1 )//當前為最後頁
{
this.LBtnFirst.Enabled = true;
this.LBtnPrev.Enabled = true;
this.LBtnNext.Enabled = false;
this.LBtnLast.Enabled = false;
}
else //中間頁
{
this.LBtnFirst.Enabled = true;
this.LBtnPrev.Enabled = true;
this.LBtnNext.Enabled = true;
this.LBtnLast.Enabled = true;
}
}
if(RecordCount == 0)//當沒有紀錄時DataGrid.PageCount會顯示1頁
this.LtlPageCount.Text = "0";
else
this.LtlPageCount.Text = PageCount.ToString();
if(RecordCount == 0)
this.LtlPageIndex.Text = "0";
else
this.LtlPageIndex.Text = (PageIndex + 1).ToString();//在有頁數的情況下前台顯示頁數加1
this.LtlPageSize.Text = PageSize.ToString();
this.LtlRecordCount.Text = RecordCount.ToString();
}
// 總頁數
public int PageCount
{
get{return this.DataGrid1.PageCount;}
}
//頁大小
public int PageSize
{
get{return this.DataGrid1.PageSize;}
}
//頁索引,從零開始
public int PageIndex
{
get{return this.DataGrid1.CurrentPageIndex;}
set{this.DataGrid1.CurrentPageIndex = value;}
}
// 紀錄總數
public int RecordCount
{
get{return recordCount;}
set{recordCount = value;}
}
}
}