Resolving IEnumerable with Unity

Question

Can Unity automatically resolve IEnumerable?

Let\'s say I have a class with this constructor:

public CoalescingParserSelector(I         


        

Answer 1

The

container.RegisterType<IEnumerable<IParserBuilder>, IParserBuilder[]>();

Worked for me only keep in mind that when you register IParserBuilder types with your container an unique name is required otherwise it will Always be an empty array. So use

container.RegisterType<IParserBuilder, RealParserBuilder>("UniqueName");

Answer 2

I believe you'll need to use the ResolveAll method and use an explicit InjectionConstructor object, i.e.:

container.RegisterType<IParserBuilder, HelpParserBuilder>();
container.RegisterType<IParserBuilder, SomeOtherParserBuilder>();

var injectedBuilders = new InjectionConstructor(container.ResolveAll<IParserBuilder>());
container.RegisterType<IParserSelector, CoalescingParserSelector>(injectedBuilders);

In other words, I don't think Unity is able to automatically resolve all instances of a type and know to use constructor injection on a class with an IEnumerable parameter without an explicitly declaring an InjectionConstructor object at Run Time.

Granted I'm still learning Unity as well, but this has been my experience (YMMV).