asp.net 4.5演習〜test5-1

webform1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="test5_1.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <div>候选国家：&nbsp;&nbsp;&nbsp;&nbsp;你喜欢的国家：</div>
        <asp:ListBox ID="lbxSource" runat="server" Width="94px" Height="150px" SelectionMode="Multiple">
            <asp:ListItem Value="1">中国</asp:ListItem>
            <asp:ListItem Value="2">美国</asp:ListItem>
            <asp:ListItem Value="3">挪威</asp:ListItem>
            <asp:ListItem Value="4">荷兰</asp:ListItem>
            <asp:ListItem Value="5">瑞士</asp:ListItem>
            <asp:ListItem Value="6">德国</asp:ListItem>
            <asp:ListItem Value="7">英国</asp:ListItem>
        </asp:ListBox>
        <asp:Button ID="btn_select" runat="server" Text="加入" style="position:relative;top:-70px;left2px;" OnClick="btn_select_Click"/>
        <asp:ListBox ID="lbxDestnition" runat="server" Height="150px" Width="90px" SelectionMode="Multiple"></asp:ListBox>
    </div>
    </form>
</body>
</html>

webform1.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace test5_1
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btn_select_Click(object sender, EventArgs e)
        {
            int count = lbxSource.Items.Count;
            int index = 0;
            for (int i = 0; i < count; i++)
            {
                ListItem item = lbxSource.Items[index];
                if (lbxSource.Items[index].Selected == true)
                {
                    lbxDestnition.Items.Add(item);
                }
                index++;
            }

            //这段代码有缺陷，框1选中的国家，加入框2时，没有做重复项判断，所以会重复添加内容。

        }
    }
}

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