在ASP.NET中跨页面实现多选

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

＜%@ Page EnableViewState="true" CodeBehind="SelectMultiPages.aspx.cs" Language="c#" 
AutoEventWireup="false" Inherits="eMeng.Exam.SelectMultiPages" %＞ 
＜!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"＞ 
＜HTML＞ 
＜HEAD＞ 
＜title＞跨页面实现多选＜/title＞ 
＜META http-equiv="content-type" content="text/html; charset=gb2312"＞ 
＜style＞ 
* {FONT-SIZE:12PX} 
#Status {text-align:left} 
＜/style＞ 
＜script language="JAVASCRIPT"＞ 
function AddRemoveValues(oChk) { 
//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。 
if(oChk.checked) 
SelectMultiPage.HdnSelectedValues.value += "," + oChk.value; 
else 
SelectMultiPage.HdnSelectedValues.value = http://www.mamicode.com/SelectMultiPage.HdnSelectedValues.value.replace("," + oChk.value,"");
} 
＜/script＞ 
＜/HEAD＞ 
＜BODY＞ 
＜form id="SelectMultiPage" runat="server"＞ 
＜asp:datagrid id="DataGrid1" HorizontalAlign="Center" AutoGenerateColumns="False" Width="600px" 
AllowPaging="True" runat="server"＞ 
＜AlternatingItemStyle BackColor="#EEEEEE"＞＜/AlternatingItemStyle＞ 
＜HeaderStyle BackColor="#AAAADD" Font-Bold="True" HorizontalAlign="Center"＞＜/HeaderStyle＞ 
＜PagerStyle HorizontalAlign="Right" Mode="NumericPages" Visible="True"＞＜/PagerStyle＞ 
＜Columns＞ 
＜asp:TemplateColumn HeaderText="选择"＞ 
＜ItemTemplate＞ 
＜input type="checkbox" runat="server" id="chkSelect" onclick="AddRemoveValues(this)" 
value=http://www.mamicode.com/‘＜%#DataBinder.Eval(Container.DataItem,"Title")%＞‘/＞
＜/ItemTemplate＞ 
＜/asp:TemplateColumn＞ 
＜asp:TemplateColumn HeaderText="文章标题"＞ 
＜ItemTemplate＞ 
＜asp:Literal Text=‘＜%# DataBinder.Eval(Container.DataItem, "Title") %＞‘ runat="server" ID="TitleShow"/＞ 
＜/ItemTemplate＞ 
＜/asp:TemplateColumn＞ 
＜asp:TemplateColumn HeaderText="发布时间"＞ 
＜ItemTemplate＞ 
＜asp:Literal Text=‘＜%# DataBinder.Eval(Container.DataItem, "CreateDate").ToString() %＞‘ runat="server"/＞ 
＜/ItemTemplate＞ 
＜/asp:TemplateColumn＞ 
＜/Columns＞ 
＜/asp:datagrid＞ 
＜div align=center＞ 
＜asp:button id="Button1" runat="server" Text="得到所选的值"＞＜/asp:button＞ 
＜div id="Status"＞ 
＜asp:label id="Label1" runat="server"＞＜/asp:label＞ 
＜/div＞ 
＜INPUT id="HdnSelectedValues" type="hidden" name="HdnSelectedValues" runat="server"＞ 
＜/div＞ 
＜/form＞ 
＜/BODY＞ 
＜/HTML＞

SelectMultiPages.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 
{ 
/// ＜summary＞ 
/// SelectMultiPages 的摘要说明。 
/// ＜/summary＞ 
public class SelectMultiPages : System.Web.UI.Page 
{ 
protected System.Web.UI.WebControls.Button Button1; 
protected System.Web.UI.WebControls.Label Label1; 
protected System.Web.UI.HtmlControls.HtmlInputHidden HdnSelectedValues; 
protected System.Web.UI.WebControls.DataGrid DataGrid1;

private void Page_Load(object sender, System.EventArgs e) 
{ 
// 在此处放置用户代码以初始化页面 
if(!Page.IsPostBack) 
BindData(); 
} 
private void DataGrid1_PageIndexChanged(object source, DataGridPageChangedEventArgs e) 
{ 
DataGrid1.CurrentPageIndex = e.NewPageIndex; 
BindData(); 
}

void BindData() 
{ 
OleDbConnection cn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" 
+ HttpContext.Current.Server.MapPath("aspx.mdb")); 
OleDbDataAdapter da = new OleDbDataAdapter("Select Title, CreateDate from Document",cn); 
DataSet ds = new DataSet(); 
da.Fill(ds); 
DataGrid1.DataSource= ds; 
DataGrid1.DataBind(); 
}

private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) 
{ 
//重新显示所选择的项目 
if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) 
{ 
if(HdnSelectedValues.Value.IndexOf(((Literal)e.Item.Cells[1].FindControl("TitleShow")).Text) ＞= 0 ) 
{ 
HtmlInputCheckBox ChkSelected = (HtmlInputCheckBox)(e.Item.Cells[0].FindControl("ChkSelect")); 
ChkSelected.Checked = true; 
} 
} 
} 
private void Button1_Click(object sender, System.EventArgs e) 
{ 
//为了显示的方便进行替换的 
Label1.Text = HdnSelectedValues.Value.Replace(",","＜li＞"); 
}

#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.DataGrid1.ItemDataBound += 
new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound); 
this.DataGrid1.PageIndexChanged += 
new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid1_PageIndexChanged); 
this.Button1.Click += new System.EventHandler(this.Button1_Click); 
this.Load += new System.EventHandler(this.Page_Load);

} 
#endregion

} 
}