Xamarin窗体，框架内的按钮不会触发事件

<Button Text="Click Me" Clicked="OnButtonClicked" />

private void OnButtonClicked(object sender, EventArgs e)
{
    // 处理按钮点击事件
}

protected override void OnAppearing()
{
    base.OnAppearing();
    // 添加调试信息
    Debug.WriteLine("View Appeared");
}

public class MyViewModel : INotifyPropertyChanged
{
    private ICommand _buttonCommand;
    public ICommand ButtonCommand
    {
        get { return _buttonCommand ?? (_buttonCommand = new Command(OnButtonClicked)); }
    }

    private void OnButtonClicked()
    {
        // 处理按钮点击事件
    }

    public event PropertyChangedEventHandler PropertyChanged;
}

<Button Text="Click Me" Command="{Binding ButtonCommand}" />

public MainPage()
{
    InitializeComponent();
    BindingContext = new MyViewModel();
}

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="XamarinFormsApp.MainPage">
    <StackLayout>
        <Button Text="Click Me" Clicked="OnButtonClicked" />
    </StackLayout>
</ContentPage>

using Xamarin.Forms;

namespace XamarinFormsApp
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void OnButtonClicked(object sender, EventArgs e)
        {
            // 处理按钮点击事件
            DisplayAlert("Button Clicked", "You clicked the button!", "OK");
        }
    }
}