在父页面中使用Xamarin表单从子视图的Bindable属性传递可绑定属性值？

public static readonly BindableProperty MyBindablePropertyProperty = BindableProperty.Create(
    nameof(MyBindableProperty), typeof(string), typeof(ChildView), default(string));

public string MyBindableProperty
{
    get { return (string)GetValue(MyBindablePropertyProperty); }
    set { SetValue(MyBindablePropertyProperty, value); }
}

<Label Text="{Binding MyBindableProperty, Source={x:Reference childView}}" />

var childView = new ChildView();
parentLayout.Children.Add(childView);

childView.MyBindableProperty = "Hello, World!";