Question

By using Microsoft’s Unity, I am able to override a dependency in the exact moment that I’m resolving an instance, for example:

var valueObjectThatOverridesAnyConfiguration = new object();

var container = new UnityContainer();
container.Resolve<ATypeWithConstructorArguments>(new DependencyOverride(typeof(object), valueObjectThatOverridesAnyPreviousConfiguration);

That will override any previous configuration on my UnityContainer and inject the instance I provided on the DependencyOverride.

Is there a way to specify it in a Container level ? Like an extension or something ? I don’t want to do it at the resolve moment!

Thanks! Let me know if I’m being confuse to you, I’ll provide more info.

Answer 1

Do you mean something like this. The part that sounds like your problem starts in the middle of the thread.

It allows you to do this

  var container = new UnityContainer();
  container.AddNewExtension<SemanticGroupExtension>();

  container.RegisterGroup<IVehicle, Car>("Car").Use<IWheel, CarWheel>().Use<IEngine, CarEngine>();
  container.RegisterGroup<IVehicle, Motorcycle>("Motorcycle").Use<IWheel, MotorcycleWheel>().Use<IEngine, MotorcycleEngine>();

  var car = container.Resolve<IVehicle>("Car");
  Assert.IsInstanceOfType(car.Wheel, typeof(CarWheel));
  Assert.IsInstanceOfType(car.Engine, typeof(CarEngine));

  var motorcycle = container.Resolve<IVehicle>("Motorcycle");
  Assert.IsInstanceOfType(motorcycle.Wheel, typeof(MotorcycleWheel));
  Assert.IsInstanceOfType(motorcycle.Engine, typeof(MotorcycleEngine));

The sources can be found here inside the TecX.Unity project.