当要在DataGrid控件中显示的数据量较大时,我们通常会采用DataGrid自带的分页功能,即AllowPaging="true"。下面转贴别人的一段代码,功能比较齐全。
//DataGridPaging.aspx
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<@ 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/ie
;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"
CellSpacing="0" CellPadding="3" GridLines="Both" BorderWidth="1"
BorderColor="black" OnPageIndexChanged="MyDataGrid_Page" PagerStyle-HorizontalAlign="Right"
PagerStyle-Mode="NumericPages" PageSize="5" AllowPaging="True">
<AlternatingItemStyle BackColor="#EEEEEE"></AlternatingItemStyle>
<HeaderStyle BackColor="#AAAADD" Font-Bold="True" HorizontalAlign="Center"></HeaderStyle>
<PagerStyle HorizontalAlign="Right" Mode="NumericPages"></PagerStyle>
<Columns>
<asp:BoundColumn HeaderText="标题" DataField="Title" HeaderStyle-Width="480px">
</asp:BoundColumn>
<asp:BoundColumn HeaderText="发表日期" DataField="CreateDate" DataFormatString="{0:yyyy-MM-dd hh:mm:ss}">
</asp:BoundColumn>
</Columns>
</asp:datagrid>
<p style="FONT-SIZE:9pt" align="center">
<asp:label id="lblPageCount" runat="server"></asp:label>
<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>
<asp:linkbutton id="btnPrev" onclick="PagerButtonClick" runat="server" Font-Name="verdana"
Font-size="8pt" ForeColor="navy" CommandArgument="prev"></asp:linkbutton>
<asp:linkbutton id="btnNext" onclick="PagerButtonClick" runat="server" Font-Name="verdana"
Font-size="8pt" ForeColor="navy" CommandArgument="next"></asp:linkbutton>
<asp:linkbutton id="btnLast" onclick="PagerButtonClick" runat="server" Font-Name="verdana"
Font-size="8pt" ForeColor="navy" CommandArgument="last"></asp:linkbutton>
</p>
</form>
</body>
</HTML>
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//DataGridPaging.aspx.cs
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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;
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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();
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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();
BindGrid();
}
private void OpenDatabase()
{
cn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" Server.MapPath("xxxx.mdb");
cn.Open();
}
private void ShowStats()
{
lblCurrentIndex.Text = "第 " (MyDataGrid.CurrentPageIndex 1).ToString() " 页";
lblPageCount.Text = "总共 " MyDataGrid.PageCount.ToString() " 页";
}
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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,CreateDate from Document", 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();
}
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Web Form Designer generated code
}
}
if((DataGrid1.CurrentPageIndex==DataGrid1.PageCount-1)&&DataGrid1.Items.Count==1)
{
if(DataGrid1.CurrentPageIndex-1>1)
{
DataGrid1.CurrentPageIndex = DataGrid1.CurrentPageIndex-1;
}
else
{
DataGrid1.CurrentPageIndex = 0;
}
}
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异常处理
1、DataGrid分页实现了,但在实际使用中会出现异常,第一种情况就是:在某个ASP.NET项目中使用如下控件,一个TextBox、一个Button和一个DataGrid,TextBox的值作为查询条件,点击Button将查询结果呈现在DataGrid中,当浏览到最后一页或页数很大的页面,改变TextBox中的值进行重新查询,往往这个时候的查询结果页数小于当前页面,就会出现下面的错误信息:无效的 CurrentPageIndex 值。必须是 >= 0 且 < PageCount。 这个问题曾经困扰了我几天,终于找到解决办法:在Button事件处理方法中加入下面一条代码即可:this.DataGrid.DataGrid1.CurrentPageIndex=0; //每次点击查询按钮时DataGrid页面都重新定向到第一页。
2、有时会碰到这样的问题:DataGrid的最后一页只有一条数据,如果将它删除,也会出现上面的错误提示,解决方法是在删除事件中加入下面的代码,网上也有很多的方法。
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