Resolving dependency in Unity

Question

I copied a repository pattern sample which uses AutoFac as IOC, But in my project i use UNITY, Any idea on how to write this in Unity 3.0

AutoFac:

  builder.Register<IUserRepository>(x => new UserEntityRepository (x.Resolve<IDataContextFactory<SampleDataContext>>())).SingleInstance();

Class where IOC will be injected:

public class UserEntityRepository : EntityRepository<User, SampleDataContext>, IUserRepository
{
    public UserEntityRepository(IDataContextFactory<SampleDataContext> databaseFactory)
        : base(databaseFactory)
    {  }
}

Are you open for configuration based solution or just code based? — danish
– danish, Commented Dec 27, 2013 at 17:18

Wiktor Zychla · Accepted Answer · 2013-12-27 18:24:07Z

1

Unity would resolve the constructor parameter automatically, if the dependency is registered. The simplest version would be then

container.RegisterType<IUserRepository, UserEntityRepository>( 
   new ContainerControlledLifetimeManager() );

However, what you do is slightly more complicated as it gives you more freedom in selecting specific parameter values. In Unity you can have this with the injection factory:

container.RegisterType<IUserRepository>( 
    new InjectionFactory(
       c => new UserEntityRepository( 
         c.Resolve<IDataContextFactory<SampleDataContext>> ), 
    new ContainerControlledLifetimeManager() );

This pretty much seems like your autofac version. Remember to register the data context factory first.

answered Dec 27, 2013 at 18:24

Wiktor Zychla

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1 Comment

kayak Over a year ago

Thanks Wiktor, the injectionFactory helped. I have tweaked the code a bit in my answer below..

Steven · Accepted Answer · 2013-12-27 17:50:49Z

0

Just do this:

container.RegisterType<IUserRepository, UserEntityRepository>();

answered Dec 27, 2013 at 17:50

Steven

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Comments

kayak · Accepted Answer · 2013-12-27 23:03:26Z

0

This one worked as i expected.., (based on Wiktor's solution)

        container.RegisterType<IUserRepository>                
           (new ContainerControlledLifetimeManager(),
           new InjectionFactory(c => new UserEntityRepository 
              (new DefaultDataContextFactory<SampleDataContext>())));

edited Dec 27, 2013 at 23:03

answered Dec 27, 2013 at 21:33

kayak

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