如何从ContentView访问Xamarin Forms App对象

public partial class App : Application
{
    public static App CurrentApp { get; private set; }

    public App()
    {
        InitializeComponent();
        CurrentApp = this;
        MainPage = new MainPage();
    }
}

public partial class MyContentView : ContentView
{
    public MyContentView()
    {
        InitializeComponent();
        var app = App.CurrentApp;
        // 使用app对象进行操作
    }
}