本文介绍如何在ASP.NET中实现多页面选择的问题。其具体思路很简单：用隐藏的INPUT记住每次选择的项目，在进行数据绑定时，检查保存的值，再在DataGrid中进行选中显示。下面时完整的代码和例子：
查看例子
SelectMultiPages.aspx
<![CDATA[<%@ Page EnableViewState="true" CodeBehind="SelectMultiPages.aspx.cs" Language="c#"<br />
AutoEventWireup="false" Inherits="eMeng.Exam.SelectMultiPages" %><br />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><br />
<HTML><br />
<HEAD><br />
<title>跨页面实现多选</title><br />
<META http-equiv="content-type" content="text/html; charset=gb2312"><br />
<style><br />
* {FONT-SIZE:12PX}<br />
#Status {text-align:left}<br />
</style><br />
<script language="JAVASCRIPT"><br />
function AddRemoveValues(oChk) {<br />
//在处理这个地方需要注意的是：你保存的值应该具有唯一性，这样才能不会替换错误的项。<br />
if(oChk.checked)<br />
SelectMultiPage.HdnSelectedValues.value += "," + oChk.value;<br />
else<br />
SelectMultiPage.HdnSelectedValues.value = SelectMultiPage.HdnSelectedValues.value.replace("," + oChk.value,"");<br />
}<br />
</script><br />
</HEAD><br />
<BODY><br />
<form id="SelectMultiPage" runat="server"><br />
<asp:datagrid id="DataGrid1" HorizontalAlign="Center" AutoGenerateColumns="False" Width="600px"<br />
AllowPaging="True" runat="server"><br />
<AlternatingItemStyle BackColor="#EEEEEE"></AlternatingItemStyle><br />
<HeaderStyle BackColor="#AAAADD" Font-Bold="True" HorizontalAlign="Center"></HeaderStyle><br />
<PagerStyle HorizontalAlign="Right" Mode="NumericPages" Visible="True"></PagerStyle><br />
<Columns><br />
<asp:TemplateColumn HeaderText="选择"><br />
<ItemTemplate><br />
<input type="checkbox" runat="server" id="chkSelect" onclick="AddRemoveValues(this)"<br />
value='<%#DataBinder.Eval(Container.DataItem,"Title")%>'/><br />
</ItemTemplate><br />
</asp:TemplateColumn><br />
<asp:TemplateColumn HeaderText="文章标题"><br />
<ItemTemplate><br />
<asp:Literal Text='<%# DataBinder.Eval(Container.DataItem, "Title") %>' runat="server" ID="TitleShow"/><br />
</ItemTemplate><br />
</asp:TemplateColumn><br />
<asp:TemplateColumn HeaderText="发布时间"><br />
<ItemTemplate><br />
<asp:Literal Text='<%# DataBinder.Eval(Container.DataItem, "CreateDate").ToString() %>' runat="server"/><br />
</ItemTemplate><br />
</asp:TemplateColumn><br />
</Columns><br />
</asp:datagrid><br />
<div align=center><br />
<asp:button id="Button1" runat="server" Text="得到所选的值"></asp:button><br />
<div id="Status"><br />
<asp:label id="Label1" runat="server"></asp:label><br />
</div><br />
<INPUT id="HdnSelectedValues" type="hidden" name="HdnSelectedValues" runat="server"><br />
</div><br />
</form><br />
</BODY><br />
</HTML><br />
]]>
SelectMultiPages.aspx.cs
<![CDATA[using System;<br />
using System.Collections;<br />
using System.ComponentModel;<br />
using System.Data;<br />
using System.Data.OleDb;<br />
using System.Drawing;<br />
using System.Web;<br />
using System.Web.SessionState;<br />
using System.Web.UI;<br />
using System.Web.UI.WebControls;<br />
using System.Web.UI.HtmlControls;<br />
namespace eMeng.Exam<br />
{<br />
/// <summary><br />
/// SelectMultiPages 的摘要说明。<br />
/// </summary><br />
public class SelectMultiPages : System.Web.UI.Page<br />
{<br />
protected System.Web.UI.WebControls.Button Button1;<br />
protected System.Web.UI.WebControls.Label Label1;<br />
protected System.Web.UI.HtmlControls.HtmlInputHidden HdnSelectedValues;<br />
protected System.Web.UI.WebControls.DataGrid DataGrid1;<br />
private void Page_Load(object sender, System.EventArgs e)<br />
{<br />
// 在此处放置用户代码以初始化页面<br />
if(!Page.IsPostBack)<br />
BindData();<br />
}<br />
private void DataGrid1_PageIndexChanged(object source, DataGridPageChangedEventArgs e)<br />
{<br />
DataGrid1.CurrentPageIndex = e.NewPageIndex;<br />
BindData();<br />
}<br />
void BindData()<br />
{<br />
OleDbConnection cn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source="<br />
+ HttpContext.Current.Server.MapPath("aspx.mdb"));<br />
OleDbDataAdapter da = new OleDbDataAdapter("Select Title, CreateDate from Document",cn);<br />
DataSet ds = new DataSet();<br />
da.Fill(ds);<br />
DataGrid1.DataSource= ds;<br />
DataGrid1.DataBind();<br />
}<br />
private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)<br />
{<br />
//重新显示所选择的项目<br />
if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)<br />
{<br />
if(HdnSelectedValues.Value.IndexOf(((Literal)e.Item.Cells[1].FindControl("TitleShow")).Text) >= 0 )<br />
{<br />
HtmlInputCheckBox ChkSelected = (HtmlInputCheckBox)(e.Item.Cells[0].FindControl("ChkSelect"));<br />
ChkSelected.Checked = true;<br />
}<br />
}<br />
}<br />
private void Button1_Click(object sender, System.EventArgs e)<br />
{<br />
//为了显示的方便进行替换的<br />
Label1.Text = HdnSelectedValues.Value.Replace(",","<li>");<br />
}<br />
#region Web 窗体设计器生成的代码<br />
override protected void OnInit(EventArgs e)<br />
{<br />
//<br />
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。<br />
//<br />
InitializeComponent();<br />
base.OnInit(e);<br />
}<br />
/// <summary><br />
/// 设计器支持所需的方法 - 不要使用代码编辑器修改<br />
/// 此方法的内容。<br />
/// </summary><br />
private void InitializeComponent()<br />
{<br />
this.DataGrid1.ItemDataBound +=<br />
new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);<br />
this.DataGrid1.PageIndexChanged +=<br />
new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid1_PageIndexChanged);<br />
this.Button1.Click += new System.EventHandler(this.Button1_Click);<br />
this.Load += new System.EventHandler(this.Page_Load);<br />
}<br />
#endregion<br />
}<br />
}<br />
]]>