ms unity and multiple constructors

Question

im trying to get ms unity to inject an object into a constructor and am having problems due to the class having multiple constructors and the same number of parameters. I know you can annotate the constructor but i dont want to do that. How can i get unity to use the correct constructor

my constructors are like so :-

  public JobsHandler(ICentralRepositoryContainer context)
  public JobsHandler(ICentralRepositoryLifeTimehelper centralRepositoryLifeTimehelper)

and i was using some code i found :-

  uContainer.RegisterType<ICentralRepositoryContainer, Entities>().Configure<InjectedMembers>().
            ConfigureInjectionFor<JobsHandler>(new InjectionConstructor());

but in getting a

The type CentralRepository.BusinessLogic.JobsHandler does not have a constructor that takes the parameters ()

Im guess this is because i havent specified the parameters in the injectionconstructor object. Am i doing this correctly?

Balthy · Accepted Answer · 2011-11-01 15:12:32Z

2

I think you will want to resolve the ICentralRepositoryContainer and use it in the InjectionConstructor

uContainer.RegisterType<ICentralRepositoryContainer, Entities>().Configure<InjectedMembers>().ConfigureInjectionFor<JobsHandler>(
  new InjectionConstructor(new ResolvedParameter(typeof(ICentralRepositoryContainer)));

Or register the jobs handler while specifying the constructor.

uContainer.RegisterType<ICentralRepositoryContainer, Entities>();
uContainer.RegisterType<JobsHandler>(new InjectionConstructor(new ResolvedParameter(typeof(ICentralRepositoryContainer))));

See this link for a more complete example of the above:

http://msdn.microsoft.com/en-us/library/ff650036.aspx

edited Nov 1, 2011 at 15:12

answered Nov 1, 2011 at 14:44

Balthy

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2 Comments

Richard Banks Over a year ago

that doesnt work. ConfigureInjectionFor is not a member of the container

Balthy Over a year ago

My apologies. I meant using the RegisterType method. I have ammended the above and added an example using your original method. P.S. I am not 100% sure if this will work as I cannot verify it currently. But I think this is roughly what you need to do.

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