aspx页面 ASP.NET Web Forms中的DropDownList添加搜索功能使用select2

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select2依赖jquery

JS直接去官网下载：https://select2.org/getting-started/basic-usage或者https://www.bootcdn.cn/

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
    <script src="Scripts/jquery-3.4.1.min.js"></script>
    <link href="Scripts/select2.min.css" rel="stylesheet" />
    <script src="Scripts/select2.min.js"></script>



      水果：  <asp:DropDownList ID="SelectSecondParty" runat="server" Width="300px"></asp:DropDownList>

    <script>
        $(document).ready(function () {
            $('#MainContent_SelectSecondParty').select2();
        });
    </script>

</asp:Content>

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后台代码 初始化点数据：

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

namespace WebApplication1
{
    public partial class _Default : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            // 添加水果到DropDownList
            SelectSecondParty.Items.Add(new ListItem("苹果", "Apple"));
            SelectSecondParty.Items.Add(new ListItem("香蕉", "Banana"));
            SelectSecondParty.Items.Add(new ListItem("樱桃", "Cherry"));
            SelectSecondParty.Items.Add(new ListItem("葡萄", "Grape"));
            SelectSecondParty.Items.Add(new ListItem("柠檬", "Lemon"));
            SelectSecondParty.Items.Add(new ListItem("芒果", "Mango"));
            SelectSecondParty.Items.Add(new ListItem("橙子", "Orange"));
            SelectSecondParty.Items.Add(new ListItem("桃子", "Peach"));
            SelectSecondParty.Items.Add(new ListItem("梨", "Pear"));
            SelectSecondParty.Items.Add(new ListItem("菠萝", "Pineapple"));
            SelectSecondParty.Items.Add(new ListItem("草莓", "Strawberry"));
            SelectSecondParty.Items.Add(new ListItem("西瓜", "Watermelon"));
        }
    }
}
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效果截图：