Resolving named dependencies with Unity

前端未结

关注

 2  1948

醉酒成梦

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

相关标签:

2条回答

一整个雨季

2021-01-12 09:07

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

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


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

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

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

0 讨论(0)

礼貌的吻别

2021-01-12 09:12

it can also be done using ParameterOverride as below

        container
            .RegisterType<IRepository, Repository>()
            .RegisterType<IGateway, Gateway>("FooGateway", new InjectionConstructor("I am foo"))
            .RegisterType<IGateway, Gateway>("BarGateway", new InjectionConstructor("I am bar"))
            .RegisterType<IServiceFoo, Service>(new InjectionConstructor(new ResolvedParameter<IRepository>(), typeof(IGateway)))
            .RegisterType<IServiceBar, Service>(new InjectionConstructor(new ResolvedParameter<IRepository>(), typeof(IGateway)));

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

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

        var serviceFoo = container.Resolve<IServiceBar>(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

0 讨论(0)