ASP.NET中 ListBox列表框控件的使用方法

ListBox 控件允许用户从预定义的列表中选择一个或多个项。它与 DropDownList 控件的不同之处在于，它不但可以一次显示多个项，而且（可选）还允许用户选择多个项。

一、属性

二、示例

ListBox.aspx

代码如下:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ListBox.aspx.cs" Inherits="WebControls_ListBox" %>
 
<!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>
    <style type="text/css">
        .style1
        {
            width: 293px;
        }
        .style2
        {
            width: 233px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h5>1,单选列表框</h5>
        省份：<asp:ListBox ID="lstProv"  runat="server">
            <asp:ListItem>山东</asp:ListItem>
            <asp:ListItem Selected="True">河北</asp:ListItem>
            <asp:ListItem>内蒙</asp:ListItem>
            <asp:ListItem>安徽</asp:ListItem>
        </asp:ListBox>
        <br />
        <asp:Button ID="btnSubmit" runat="server" Text="提交" onclick="btnSubmit_Click" />
        <hr />
        你选择的为：<asp:Label ID="lblState" runat="server"></asp:Label>
 
        <hr />
        <h5>
            2,多选列表框</h5>
        省份：<asp:ListBox ID="lstProv2" runat="server" SelectionMode="Multiple">
            <asp:ListItem>山东</asp:ListItem>
            <asp:ListItem Selected="True">河北</asp:ListItem>
            <asp:ListItem>内蒙</asp:ListItem>
            <asp:ListItem>安徽</asp:ListItem>
        </asp:ListBox>
          提示：Ctrl+单击<br />
        <asp:Button ID="btnSubmit2" runat="server" Text="提交"
            onclick="btnSubmit2_Click"  />
        <hr />
        你选择的为：<asp:Label ID="lblState2" runat="server"></asp:Label>
    </div>
    </form>
</body>
</html>

ListBox.aspx.cs

代码如下:

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
public partial class WebControls_ListBox : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        lblState.Text = lstProv.SelectedValue;
    }
    protected void btnSubmit2_Click(object sender, EventArgs e)
    {
        string str = string.Empty;
        for (int i = 0; i < lstProv2.Items.Count; i++)
        {
            if (lstProv2.Items[i].Selected == true)
            {
                str = string.Format("{0}{1},",str,lstProv2.Items[i].Value);
            }
        }
        str = str.Substring(0, str.Length - 1); //去掉最后一个“,”
        lblState2.Text = str;
    }
}