Constructor injection by name

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Jordan

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Sep 10, 2018, 10:18:33 AM9/10/18
to Castle Project Users
Hi all,

If there are 2 different named implementations of an interface in the container, will the first one be always be automatically selected by the container for constructor injection?

Is there any way of automatically injecting both instances into a constructor?  Or a dictionary of all implementations?

eg if there are 2 named implementations of ISomeService, "defaultSomeService", and "alternativeSomeService",  and I have a constructor like this:


        public SomeOtherComponent(ISomeService defaultSomeService, ISomeService alternativeSomeService) 
        {
                  //................
        }

is there any way of getting the container to automatically inject both implementations by name? Or will "defaultSomeService" just be injected twice ?

thanks,
Jordan


Sunny

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Sep 10, 2018, 11:05:11 AM9/10/18
to castle-pro...@googlegroups.com
Did you try to iniect IEnumerable<ISomeService>? This will inject both in the order of registration.

Cheers,
Sunny

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Jordan

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Sep 10, 2018, 11:24:16 AM9/10/18
to Castle Project Users
Ah no! I didn't try that.
Thankyou, that could be ok. 

I'd just switched to using ServiceOverride.ForKey which is working but doesn't give me the thrill of automatic registration :)

Jordan.


On Monday, September 10, 2018 at 4:05:11 PM UTC+1, Svetoslav Milenov - Sunny wrote:
Did you try to iniect IEnumerable<ISomeService>? This will inject both in the order of registration.

Cheers,
Sunny

On Mon, Sep 10, 2018, 9:18 AM 'Jordan' via Castle Project Users <castle-pro...@googlegroups.com> wrote:
Hi all,

If there are 2 different named implementations of an interface in the container, will the first one be always be automatically selected by the container for constructor injection?

Is there any way of automatically injecting both instances into a constructor?  Or a dictionary of all implementations?

eg if there are 2 named implementations of ISomeService, "defaultSomeService", and "alternativeSomeService",  and I have a constructor like this:


        public SomeOtherComponent(ISomeService defaultSomeService, ISomeService alternativeSomeService) 
        {
                  //................
        }

is there any way of getting the container to automatically inject both implementations by name? Or will "defaultSomeService" just be injected twice ?

thanks,
Jordan


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