Setting the parameterless constructor as the injection constructor in container creation

Question

I have a class with two ctors. One parameterless and one with parameters.
Unity will by default take the gready approach and go for the last ctor.

How can I define what ctor to use (I want to parameterless) without adding dependency on Unity within my classes? I think it is possible to do it in my container creation, but I don't know how.

Currently my registration entry looks like this:

container.RegisterType<IConfigurationService, SqlConfigurationService>()

UPDATE
I'm trying to avoid programming in XML (config file) as much as possible.

EXTRA
How would registering a constructor with one parameter (which in it's turn should be injected)?
Say ILoggerService is already registered and I would want to use the constructor

public SqlConfigurationService(ILoggerService logger){}

Mark Seemann · Accepted Answer · 2009-12-22 11:04:04Z

19

I don't have Unity nearby right now, but as far as I recall, you can do something like this:

container.RegisterType<IConfigurationService, SqlConfigurationService>(
    new InjectionConstructor())

answered Dec 22, 2009 at 11:04

Mark Seemann

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2 Comments

Boris Callens Over a year ago

Thanks :) Do you per chance also know how to solve my extra question (bottom of OP)?

Mark Seemann Over a year ago

Total guess after looking a bit at the API docs:

container.RegisterType<IConfigurationService, SqlConfigurationService>(new InjectionConstructor(new ResolvedParameter<ILoggerService>()));

Botz3000 · Accepted Answer · 2009-12-22 10:58:50Z

0

I think you can also pass in an InjectionConstructor (including ResolvedParameter<T>s for the parameters) in your registration. Have you tried that?

answered Dec 22, 2009 at 10:58

Botz3000

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Comments

Lee · Accepted Answer · 2009-12-22 11:09:12Z

0

You can apply the InjectionConstructor attribute to the constructor you want to use. This does have the disadvantange of moving some container configuration away from a central location however.

answered Dec 22, 2009 at 11:09

Lee

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1 Comment

Boris Callens Over a year ago

I don't want to add any dependency in my actual classes (ref OP)

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