CODEWITHSUNDEEP
c#dependency-injectionautofac
Travieso
Travieso

Reputation: 437

Autofac - Injecting Keyed service with NamedParameter into constructor

I have a Keyed service registered in Autofac that I would like to be injected via the constructor. The service is registered

builder.Register((ctx, par) =>
{
    var namedParameter = par.Named<string>("myNamedParameter");
    ... configuration and instantiation ...
}).Keyed<IMyService>(myKey);

and is currently being resolved explicitly

public class MyConsumer {
    private readonly IMyService _myService;

    //current
    public MyConsumer(ILifetimeScope scope) {
        _myService = _scope.ResolveKeyed<IMyService>(myKey, new NamedParameter("myNamedParameter", "parameterValue"));
    }

    //preferred
    public MyConsumer(IMyService myService) {
        _myService = myService;
    }
}

However, I haven't been able to find a way to have said service injected during construction. Autofac's KeyFilterAttribute only accepts a key; it doesn't appear to allow for NamedParameters. Is this possible?

Upvotes: 0

Views: 967

Answers (1)

Cyril Durand
Cyril Durand

Reputation: 16192

NamedService is a specialized version of KeyedService where the key is of type String.

both 

c.RegisterType<T>().Named<IT>("x"); 
c.RegisterType<T>().Keyed<IT>("x");

are equivalent.

You can use 

public MyConsumer([KeyFilter("x")]IMyService myService) {
    _myService = myService;
}

and it will resolve the service named "x" of type IMyService

Upvotes: 2

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