获取CheckBoxList的当前选择项代码,Asp.Net代码库,德仔网

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【Asp.Net】获取CheckBoxList的当前选择项

作者:dezai / 发布于2014/7/2/ 718

CheckBoxList中有多个项，当选择/不选择某项时如果其AutoPostBack为True，则会触发SelectedIndexChanged，但是CheckBoxList及其Items属性都没有直接能获取当前选择的项的属性，想了一下，可以先将上一次的勾选状态存到ViewState中，在触发SelectedIndexChanged的时候进行比较


	<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>
	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head runat="server">
	 <title>无标题页</title>
	</head>
	<body>
	 <form id="form1" runat="server">
	 <div>
	
	 <asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True"
	 onprerender="CheckBoxList1_PreRender"
	 onselectedindexchanged="CheckBoxList1_SelectedIndexChanged"
	 RepeatDirection="Horizontal">
	 <asp:ListItem>1</asp:ListItem>
	 <asp:ListItem>2</asp:ListItem>
	 <asp:ListItem Selected="True">3</asp:ListItem>
	 <asp:ListItem>4</asp:ListItem>
	 <asp:ListItem>5</asp:ListItem>
	 </asp:CheckBoxList>
	 </div>
	 </form>
	</body>
	</html>

	

	

	

	using System;
	using System.Collections.Generic;
	namespace WebApplication1
	{
	 public partial class _Default : System.Web.UI.Page
	 {
	 protected void Page_Load(object sender, EventArgs e)
	 {
	 Dictionary<int, bool> dic = new Dictionary<int, bool>();
	 for (int i = 0; i < CheckBoxList1.Items.Count; i++)
	 dic.Add(i, CheckBoxList1.Items[i].Selected);
	 if (ViewState["cblChecked"] == null)
	 ViewState["cblChecked"] = dic;
	 }
	 protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
	 {
	 if (ViewState["cblChecked"] != null)
	 {
	 Dictionary<int, bool> dic = ViewState["cblChecked"] as Dictionary<int,bool>;
	 for (int i = 0; i < CheckBoxList1.Items.Count; i++)
	 {
	 if (dic[i] != CheckBoxList1.Items[i].Selected)
	 Response.Write("当前操作项为:" + i.ToString());
	 dic[i] = CheckBoxList1.Items[i].Selected;
	 }
	 ViewState["cblChecked"] = dic;
	 }
	 }
	 }
	}

试试其它关键字

　CheckBoxList　　当前选择项　　选择项　

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