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

it can also be done using ParameterOverride as below

        container
            .RegisterType()
            .RegisterType("FooGateway", new InjectionConstructor("I am foo"))
            .RegisterType("BarGateway", new InjectionConstructor("I am bar"))
            .RegisterType(new InjectionConstructor(new ResolvedParameter(), typeof(IGateway)))
            .RegisterType(new InjectionConstructor(new ResolvedParameter(), typeof(IGateway)));

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

        var serviceBar = container.Resolve(new ParameterOverride("gateway", barGateway));
        var serviceBarGatewayName = serviceBar.DoSomething();

        var serviceFoo = container.Resolve(new ParameterOverride("gateway", fooGateway));
        var serviceFooGatewayName = serviceFoo.DoSomething();

        Assert.AreEqual("I am bar", barGateway.Name); // pass
        Assert.AreEqual("I am foo", fooGateway.Name); // pass


        Assert.AreEqual("I am bar", serviceBarGatewayName); // pass
        Assert.AreEqual("I am foo", serviceFooGatewayName); // pass