ViewModelFactory (Mediator Pattern)

CharacterController.cs

public class CharacterController : Controller
{
	/*[...]*/
	public IActionResult Profile(int id)
	{
		/*[...]*/
    		var viewModel = viewFactory.Build<int, CharacterProfileViewModelBuilder>(id);
    		return View(viewModel);
	}
}

CharacterProfileViewModelBuilder.cs

public class CharacterProfileViewModelBuilder : IViewModelBuilder<Character, CharacterProfileViewModel>
{
	private readonly DatabaseContext context;
	private readonly IMapper mapper;
  
  	//Dependencies "automatic" discovered by ASP.NET Core container
	public CharacterProfileViewModelBuilder(DatabaseContext context, IMapper mapper)
	{
		this.context = context;
		this.mapper = mapper;
	}

	public CharacterProfileViewModel Build(Character input)
	{
		return new CharacterProfileViewModel{Id = input.Id, Name = input.Name};
	}
}

DefaultViewFactory.cs

public class DefaultViewFactory : IViewModelFactory
{
	private readonly IServiceProvider provider;
  
	public DefaultViewFactory(IServiceProvider provider)
	{
		this.provider = provider;
	}
  
	protected IViewModelBuilder<TViewModel> GetViewBuilder<TViewModel>()
	{
		return provider.GetService(typeof (IViewModelBuilder<TViewModel>)) as IViewModelBuilder<TViewModel>;
	}

	protected IViewModelBuilder<TInput, TViewModel> GetViewBuilder<TInput, TViewModel>()
	{
		return provider.GetService(typeof (IViewModelBuilder<TInput, TViewModel>)) as IViewModelBuilder<TInput, TViewModel>;
	}

	public TViewModel Build<TViewModel>()
	{
		var builder = GetViewBuilder<TViewModel>();
		return (builder != null ? builder.Build() : Activator.CreateInstance<TViewModel>());
	}

	public TViewModel Build<TInput, TViewModel>(TInput input)
	{
		var builder = GetViewBuilder<TInput, TViewModel>();
		return (builder != null ? builder.Build(input) : Activator.CreateInstance<TViewModel>());
	}
}

IViewModelBuilder.cs

public interface IViewModelBuilder<TViewModel>
{
	TViewModel Build();
}

public interface IViewModelBuilder<TInput, TViewModel>
{
	TViewModel Build(TInput input);
}

IViewModelFactory.cs

public interface IViewModelFactory
{
	TViewModel Build<TViewModel>();
	TViewModel Build<TInput, TViewModel>(TInput input);
}