Unity: Constructor injection with mutiple constructors

Question

I'm trying to inject an EF ObjectContext using Unity constructor injection. My attemp is to register the type in the bootsprapper like this:

protected override void ConfigureContainer()
{
    base.ConfigureContainer();
    Container.RegisterType<ObjectContext, MyObjectContext>(new InjectionConstructor());
}

EF creates mutiple constructors which look like these

public MyObjectContext() : base("name=MyObjectContext", "MyObjectContext")
public MyObjectContext(string connectionString) : base(connectionString, "MyObjectContext")
public MyObjectContext(EntityConnection connection) : base(connection, "MyObjectContext")

When debugging my code Unity throws a ResolutionFailedException telling me "The type MyObjectContext has multiple constructors of length 1. Unable to disambiguate." at the time when a new class that has the following constructor is resolved.

public MainViewModel(UnityContainer container, MyObjectContext entities)

As far as I know using RegisterType with new InjectionConstructor() as argument ensures that the default parameterless constructor is called (thats what I want). Why can't Unity resolve the type as expected? Do I miss anything?

Best Regards

Jay

Phil Sandler · Accepted Answer · 2011-07-11 03:28:29Z

3

Your registration looks right. You sure the registration code is getting called? Try putting a breakpoint on it.

(Off topic: why are you passing your container to your viewmodel?)

answered Jul 11, 2011 at 3:28

Phil Sandler

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1 Comment

Jay Over a year ago

I mark this as an answer because it led me to the solution. It seems that Unity had some issues resolving the type because I had registered it at the wrong place. I passed the container because I thought I would need it to resolve registered instances/types across projects (shell, modules, infrastructure etc.) but that doesn't seem to be the right/working way.

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