如何在windows窗体中创建自定义多行自动完成建议文本框

using System;
using System.Data;
using System.Linq;
using System.Windows.Forms;

namespace WindowsFormsApp
{
    public partial class Form1 : Form
    {
        private string[] suggestions = { "apple", "banana", "cherry", "date", "elderberry" };

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.Multiline = true;
            textBox1.AutoCompleteMode = AutoCompleteMode.Suggest;

            listBox1.Visible = false;
            listBox1.SelectedIndexChanged += ListBox1_SelectedIndexChanged;
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            string input = textBox1.Text;

            // 根据输入内容获取匹配的建议列表
            string[] matchedSuggestions = suggestions.Where(s => s.StartsWith(input)).ToArray();

            // 更新建议列表
            listBox1.Items.Clear();
            listBox1.Items.AddRange(matchedSuggestions);

            // 显示或隐藏建议列表
            listBox1.Visible = matchedSuggestions.Length > 0;
        }

        private void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            // 将选择的建议项填充到文本框中
            textBox1.Text = listBox1.SelectedItem.ToString();

            // 隐藏建议列表
            listBox1.Visible = false;
        }
    }
}