C# Unity Replace InjectionFactory by RegisterFactory Example

When you use RegisterType or RegisterInstance combined with InjectionFactory in old version of Unity, the following complier warning will be displayed:

'InjectionFactory' is obsolete: 'InjectionFactory has been deprecated and will be removed in next release. Please use IUnityContainer.RegisterFactory(...) method instead.

The code that triggered the warning:

var container = new UnityContainer();
container.RegisterType<IAnimal, Cat>("Cat", new InjectionConstructor());
container.RegisterType<IAnimal, Dog>("Dog", new InjectionConstructor());

container.RegisterType<List<IAnimal>>(
    "AnimalList",
    new InjectionFactory(
        m => new List<IAnimal>
        {
            m.Resolve<IAnimal>("Cat"),
            m.Resolve<IAnimal>("Dog"),
        }
        )
);

The solution is straightforward, follow the instruction and use RegisterFactory instead:

container.RegisterFactory<List<IAnimal>>(
    "AnimalList",
    m => new List<IAnimal>
    {
        m.Resolve<IAnimal>("Cat"),
        m.Resolve<IAnimal>("Dog"),
    }
);

The main difference of the replacement:

1. Replace "RegisterType" to "RegisterFactory"
2. Remove InjectionFactory wrapper

Moreover, it's easy to find the difference by comparing the declarations:

IUnityContainer RegisterType<T>(this IUnityContainer container, string name, params InjectionMember[] injectionMembers);
InjectionFactory(Func<IUnityContainer, object> factoryFunc);

IUnityContainer RegisterFactory<TInterface>(this IUnityContainer container, string name, Func<IUnityContainer, object> factory, IFactoryLifetimeManager lifetimeManager = null);