Resolving named dependencies with Unity

Question

I have a service with 2 dependencies: a Repository and a Gateway (sms).

I need to resolve 2 different versions of the service that only differ on one of the paramete

Answer 1

Still have no idea why your version doesn't work but this DOES work (as I've expected):

        var container = new UnityContainer();
        container
            .RegisterType()
            .RegisterType( "FooGateway", new InjectionConstructor( "I am foo" ) )
            .RegisterType( "BarGateway", new InjectionConstructor( "I am bar" ) )
            //.RegisterType( new InjectionConstructor( new ResolvedParameter(), new ResolvedParameter( "FooGateway" ) ) )
            //.RegisterType( new InjectionConstructor( new ResolvedParameter(), new ResolvedParameter( "BarGateway" ) ) );
            .RegisterType( new InjectionFactory( c => new Service( c.Resolve(), c.Resolve( "FooGateway" ) ) ) )
            .RegisterType( new InjectionFactory( c => new Service( c.Resolve(), c.Resolve( "BarGateway" ) ) ) );

Note that I am using InjectionFactory instead of InjectionConstructor.

Yet another version that works. This time I keep your way of registering services but I make them named and resolve by name:

        var container = new UnityContainer();
        container
            .RegisterType()
            .RegisterType( "FooGateway", new InjectionConstructor( "I am foo" ) )
            .RegisterType( "BarGateway", new InjectionConstructor( "I am bar" ) )
            .RegisterType( "sf", new InjectionConstructor( new ResolvedParameter(), new ResolvedParameter( "FooGateway" ) ) )
            .RegisterType( "sb", new InjectionConstructor( new ResolvedParameter(), new ResolvedParameter( "BarGateway" ) ) );
            //.RegisterType( new InjectionFactory( c => new Service( c.Resolve(), c.Resolve( "FooGateway" ) ) ) )
            //.RegisterType( new InjectionFactory( c => new Service( c.Resolve(), c.Resolve( "BarGateway" ) ) ) );


        var barGateway = container.Resolve( "BarGateway" );
        var fooGateway = container.Resolve( "FooGateway" );

        var serviceBar = container.Resolve( "sb" );
        var serviceBarGatewayName = serviceBar.DoSomething();

        var serviceFoo = container.Resolve( "sf" );
        var serviceFooGatewayName = serviceFoo.DoSomething();