如何在Xamarin表单输入中检测到用户键入了哪个键？

using Xamarin.Forms;

namespace KeyDetectionApp
{
    public class App : Application
    {
        public App()
        {
            MainPage = new ContentPage
            {
                Content = new StackLayout
                {
                    Children = 
                    {
                        new Entry { Placeholder = "Type here..." },
                        new Label { Text = "You typed: " }
                    }
                }
            };

            // 绑定事件处理器
            ((ContentPage)MainPage).Content.FindByName<Entry>("entry").TextChanged += Entry_TextChanged;
        }

        private void Entry_TextChanged(object sender, TextChangedEventArgs e)
        {
            Entry entry = (Entry)sender;
            Label label = ((ContentPage)MainPage).Content.FindByName<Label>("label");
            label.Text = $"You typed: {entry.Text}";
        }
    }
}