如何使用MVVM在代码中使用"text.changed“控件(在Xamarin.Forms中)

public class MyViewModel : INotifyPropertyChanged
{
    private string _text;

    public string Text
    {
        get { return _text; }
        set
        {
            if (_text != value)
            {
                _text = value;
                OnPropertyChanged(nameof(Text));
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

<StackLayout>
    <Entry Text="{Binding Text, Mode=TwoWay}" TextChanged="OnTextChanged" />
    <Label Text="{Binding Text}" />
</StackLayout>

public partial class MyPage : ContentPage
{
    public MyPage()
    {
        InitializeComponent();
        BindingContext = new MyViewModel();
    }

    private void OnTextChanged(object sender, TextChangedEventArgs e)
    {
        // 处理文本改变事件
    }
}