如何使用PRISM实现Xamarin表单的Singleton？

public class SingletonService
{
    private static SingletonService _instance;
    
    private SingletonService()
    {
        // 私有构造函数
    }
    
    public static SingletonService Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = new SingletonService();
            }
            return _instance;
        }
    }
}

public class MyViewModel : BindableBase
{
    private SingletonService _singletonService;
    
    public MyViewModel(SingletonService singletonService)
    {
        _singletonService = singletonService;
    }
    
    // 其他ViewModel的代码
}

protected override void RegisterTypes(IContainerRegistry containerRegistry)
{
    containerRegistry.RegisterSingleton<SingletonService>();
}