Xamarin.Forms:如何在ListView中搜索小写或大写？

using System;
using System.Collections.Generic;
using System.Linq;
using Xamarin.Forms;

namespace YourNamespace
{
    public partial class YourPage : ContentPage
    {
        private List<string> dataList; // 假设这是你的数据源

        public YourPage()
        {
            InitializeComponent();
            dataList = new List<string> { "Apple", "Banana", "Orange", "Grape" }; // 初始化数据源

            // 创建ListView和搜索框
            var listView = new ListView();
            var searchBar = new SearchBar();

            // 监听搜索框文本变化事件
            searchBar.TextChanged += (sender, e) =>
            {
                // 根据搜索框的文本过滤数据源
                var keyword = searchBar.Text.ToLower();
                var filteredData = dataList.Where(item => item.ToLower().Contains(keyword)).ToList();

                // 更新ListView的数据源
                listView.ItemsSource = filteredData;
            };

            // 将ListView和搜索框添加到页面布局中
            Content = new StackLayout
            {
                Children = { searchBar, listView }
            };
        }
    }
}