iOS Xamarin MVVM Light - GetAndRemoveParameter() method

Question

I'm a newbie. I pass a parameter from a UIViewController to another with this method:

FirstViewController:

string parameter = "test";
var navigation = ServiceLocator.Current.GetInstance<INavigationService>();
navigation.NavigateTo("SecondViewController", parameter);

And after I would like to get my parameter:

SecondViewController:

var nav = new NavigationService().Initialize(NavigationController);
UIViewController controller = nav.NavigationController.TopViewController ; //The UIKit.UIViewController that was navigated to
string param = (String)nav.GetAndRemoveParameter(controller);

But the parameter result is null. Where I make mistakes? How can I get my parameter?

Answer 1

I solved this error in this way:

var navigation = (NavigationService)ServiceLocator.Current.GetInstance<INavigationService>(); 

I must to use a cast before this line of code. Thank you all