ListBox 控件允許用戶從預(yù)定義的列表中選擇一個(gè)或多個(gè)項(xiàng)。它與 DropDownList 控件的不同之處在于，它不但可以一次顯示多個(gè)項(xiàng)，而且（可選）還允許用戶選擇多個(gè)項(xiàng)。
一、屬性
| 屬性 | 值 | 作用 |
| SelectionMode | Single|Multiple | 列表選擇模式：單選|多選 |
| Selected | False|true | 是否為選中狀態(tài) |
二、示例
ListBox.aspx
代碼如下:
<%@ 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,單選列表框</h5>
省份：<asp:ListBox ID="lstProv" runat="server">
<asp:ListItem>山東</asp:ListItem>
<asp:ListItem Selected="True">河北</asp:ListItem>
<asp:ListItem>內(nèi)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 />
你選擇的為：<asp:Label ID="lblState" runat="server"></asp:Label>
<hr />
<h5>
2,多選列表框</h5>
省份：<asp:ListBox ID="lstProv2" runat="server" SelectionMode="Multiple">
<asp:ListItem>山東</asp:ListItem>
<asp:ListItem Selected="True">河北</asp:ListItem>
<asp:ListItem>內(nèi)蒙</asp:ListItem>
<asp:ListItem>安徽</asp:ListItem>
</asp:ListBox>
提示：Ctrl+單擊<br />
<asp:Button ID="btnSubmit2" runat="server" Text="提交"
onclick="btnSubmit2_Click" />
<hr />
你選擇的為：<asp:Label ID="lblState2" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
ListBox.aspx.cs
代碼如下:
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); //去掉最后一個(gè)“,”
lblState2.Text = str;
}
}