asp.net中ListBox控件经典实例（反向遍历）

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.aspx代码如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ListBox控件.aspx.cs" Inherits="ListBox控件" %><!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></title></head><body>    <form id="form1" runat="server">    <div>    <p2>ListBox控件练习：<br />        </p2>         <asp:ListBox             ID="ListBox1" runat="server" Height="76px" SelectionMode="Multiple"             style="margin-right: 17px" Width="88px" >            <asp:ListItem>1</asp:ListItem>            <asp:ListItem>2</asp:ListItem>            <asp:ListItem>3</asp:ListItem>            <asp:ListItem>4</asp:ListItem>            <asp:ListItem>5</asp:ListItem>            <asp:ListItem>6</asp:ListItem>            <asp:ListItem>7</asp:ListItem>            <asp:ListItem>8</asp:ListItem>            <asp:ListItem>9</asp:ListItem>        </asp:ListBox>        <asp:Button ID="Button1" runat="server" Text="选择" onclick="Button1_Click" />        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>        <br />        点菜程序<br />        <asp:ListBox ID="ListBox2" runat="server" Height="184px"             SelectionMode="Multiple" style="margin-right: 17px" Width="131px" >            <asp:ListItem>鱼香茄子</asp:ListItem>            <asp:ListItem>辣子鸡</asp:ListItem>            <asp:ListItem>酸菜鱼</asp:ListItem>            <asp:ListItem>酸辣土豆丝</asp:ListItem>            <asp:ListItem>麻婆豆腐</asp:ListItem>            <asp:ListItem>蜀山烤鱼</asp:ListItem>            <asp:ListItem>宫保鸡丁</asp:ListItem>            <asp:ListItem>土豆牛腩</asp:ListItem>            <asp:ListItem>红烧肉</asp:ListItem>        </asp:ListBox>        <asp:Button ID="Button3" runat="server" Text="选择" onclick="Button3_Click" />        <asp:Button ID="Button2" runat="server" Text="移除" onclick="Button2_Click" />        <asp:ListBox ID="ListBox3" runat="server" Height="184px"             SelectionMode="Multiple" style="margin-right: 17px" Width="131px" >        </asp:ListBox>    </div>    </form></body></html>

.aspx.cs代码如下：

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;public partial class ListBox控件 : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {    }    protected void Button1_Click(object sender, EventArgs e)    {        TextBox1.Text = "";        // for (int i = 0; i < ListBox1.Items.Count; i++) {        // if (ListBox1.Items[i].Selected) { TextBox1.Text += ListBox1.Items[i].Text+"，"; }        // }        foreach (ListItem _li in ListBox1.Items)        {            if (_li.Selected) { TextBox1.Text += _li.Text; }        }    }    protected void Button3_Click(object sender, EventArgs e)//为什么要用反向遍历，要注意！！！！！！    {        for (int i = ListBox2.Items.Count - 1; i >= 0; i--)        {            if (ListBox2.Items[i].Selected)            {                ListBox3.Items.Add(ListBox2.Items[i]);                ListBox2.Items.Remove(ListBox2.Items[i]);            }        }    }    protected void Button2_Click(object sender, EventArgs e)    {        for (int i = ListBox3.Items.Count - 1; i >= 0; i--)        {            if (ListBox3.Items[i].Selected)            {                ListBox2.Items.Add(ListBox3.Items[i]);//添加功能                ListBox3.Items.Remove(ListBox3.Items[i]);//移除功能            }        }    }}

效果如下：

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