Xamarin Forms dependency service don't work with generics? - xamarin

Question

I'm trying to get an instance of generic class in Xamarin.Forms. If I use the code below everything works fine:
Interface
namespace PrismNinjectApp1.Application.Interfaces
{
public interface IUserService { }
}
Concrete class
[assembly: Dependency(typeof(PrismNinjectApp1.Application.DomainServices.UserService))]
namespace PrismNinjectApp1.Application.DomainServices
{
public class UserService : IUserService
{
public UserService() { }
}
}
View Model
namespace PrismNinjectApp1.ViewModels
{
public class MainPageViewModel : BindableBase, INavigationAware
{
private readonly IUserService _userService;
public MainPageViewModel()
{
_userService = DependencyService.Get<IUserService>();
}
//Implementation of INavigationAware interface (I'm using Prism)
}
}
But if I try do the same with generics I can't get the object instance:
Interface
namespace PrismNinjectApp1.test
{
public interface IMyInterface<T> where T : class { }
}
Concrete class
[assembly: Dependency(typeof(PrismNinjectApp1.test.MyInterface<>))]
namespace PrismNinjectApp1.test
{
public class MyInterface<T> : IMyInterface<T> where T : class { }
}
View Model
namespace PrismNinjectApp1.ViewModels
{
public class MainPageViewModel : BindableBase, INavigationAware
{
private readonly IMyInterface<Users> _myInterface;
public MainPageViewModel()
{
_myInterface = DependencyService.Get<IMyInterface<Users>>(); //Gets NULL value
}
//Implementation of INavigationAware interface (I'm using Prism)
}
}
Users class is a domain entity
public class Users
{
[PrimaryKey, AutoIncrement]
public int Id { get; set; }
[MaxLength(100)]
public string Name { get; set; }
}
Any idea how I can get this object instance?
I trying to do this because I want to use generics services and repositories with basic CRUD and search methods with this structure
App (project droid and ios)
Shared (portable project)
Application (for external services - portable projec)
Domain - (portable project)
Data - (portable project)
Xamarin Forms version: 2.3.4.247