Unity IoC Newbie - Constructor Injection fail!

I'm just starting trying to work with the Unity IoC framework, but I'm struggling to get the container resolving properly when it has a parameter in the constructor.

I was watching Dave Hayden's webcast and it seems that I don't need to register the class I want to construct.

So I have a class which wraps unity

public class UnityContainer : IContainer

{

private Microsoft.Practices.Unity.IUnityContainer _container;

public UnityContainer()

{

_container = new Microsoft.Practices.Unity.UnityContainer()

.RegisterType<IChannel, SimpleEvent>()

.RegisterType<IChannelID, ChannelID>();

//_container.Configure<InjectedMembers>().ConfigureInjectionFor<Broker>(new InjectionConstructor(new ChannelFactory));

}

public T Resolve<T>()

{

return (T) _container.Resolve<T>();

}

I also have another class which I want to construct with unity

public class Broker : IBroker

{

ChannelFactory _factory;

public Broker(ChannelFactory factory)

{

_factory = factory;

}

...

public class ChannelFactory

{

private readonly IContainer _container;

public ChannelFactory(IContainer container)

{

_container = container;

}

...

In my test I have

[TestMethod]

public void T5_Create_Broker_With_Unity()

{

IContainer container = new UnityContainer();

IBroker broker = container.Resolve<Broker>();

}

When I run the test code it fails ... telling me "The parameter factory could not be resolved when attempting to call constructor ... Are you missing a type mapping?" I did try and register the type, but it didn't make any difference. (Full error below)

I must be doing something pretty elementary wrong! I'd be grateful if someone could point out what I am missing.

Many Thx

Simon

Error text

Test method Test_CommunicationsBroker.BrokerTests.T5_Create_Broker_With_Unity threw exception: Microsoft.Practices.Unity.ResolutionFailedException: Resolution of the dependency failed, type = "MessageRouter.Broker", name = "". Exception message is: The current build operation (build key Build Key[MessageRouter.Broker, null]) failed: The parameter factory could not be resolved when attempting to call constructor MessageRouter.Broker(MessageRouter.ChannelFactory factory). (Strategy type BuildPlanStrategy, index 3) ---> Microsoft.Practices.ObjectBuilder2.BuildFailedException: The current build operation (build key Build Key[MessageRouter.Broker, null]) failed: The parameter factory could not be resolved when attempting to call constructor MessageRouter.Broker(MessageRouter.ChannelFactory factory). (Strategy type BuildPlanStrategy, index 3) ---> System.InvalidOperationException: The parameter factory could not be resolved when attempting to call constructor MessageRouter.Broker(MessageRouter.ChannelFactory factory). ---> Microsoft.Practices.ObjectBuilder2.BuildFailedException: The current build operation (build key Build Key[MessageRouter.ChannelFactory, null]) failed: The parameter container could not be resolved when attempting to call constructor MessageRouter.ChannelFactory(MessageRouter.IContainer container). (Strategy type BuildPlanStrategy, index 3) ---> System.InvalidOperationException: The parameter container could not be resolved when attempting to call constructor MessageRouter.ChannelFactory(MessageRouter.IContainer container). ---> Microsoft.Practices.ObjectBuilder2.BuildFailedException: The current build operation (build key Build Key[MessageRouter.IContainer, null]) failed: The current type, MessageRouter.IContainer, is an interface and cannot be constructed. Are you missing a type mapping? (Strategy type BuildPlanStrategy, index 3) ---> System.InvalidOperationException: The current type, MessageRouter.IContainer, is an interface and cannot be constructed. Are you missing a type mapping?.

Unity IoC Newbie - Constructor Injection fail!

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