How to use Dependency Injection and not Service Locator?

Yes, this is called the composition root of your application, and it's where you would configure your IoC container and resolve your root type.

(if I/that makes sense at all) Yes, this is called the composition root of your application, and it's where you would configure your IoC container and resolve your root type. It isn't right to have all your code littered with dependencies on the IoC container of choice, is it? Correct, it is better to not pass references to your IoC container around your types, as this will make them less reusable, and couple the types to the concept of IoC containers in general.

So where do you "use" your the container (for rexolving)? And how do you get it to resolve everything, as deep as your code goes? Is it a part of designing everything the right way by using interfaces through every layer up till the front layer?

You would use your container at your composition root, and anywhere in your code that needs to instantiate types (i.e. From factory types) via the container (usually for dependency chain support). Many IoC containers can generate these factory types for you, so you only need to pass, e.g. IMyFactory as a dependency, or in some IoC container's case, a Func.

That means that you don't need to create factory types that have a dependency on your IoC container.In terms of using interfaces, the Dependency Inversion Principle states that you should depend on abstractions, not on concretions, so you will need to factor your code with this concept in mind if you wish to adopt dependency injection.

Thanks for the answer. Do you have a good code example (or link to it) for the factory types? And maybe when and where to use those?

– Rodi Mar 29 at 11:50 Are you using a particular IoC container? – devdigital Mar 29 at 12:37 I was going to settle on Ninject 2. – Rodi Mar 29 at 14:37 This might be helpful - stackoverflow.Com/questions/4840157/… – devdigital Mar 29 at 15:35 I think I'm starting to get the idea.

Automatic Factories are not supported (yet) in Ninject, but most of the time I think I can manage with a full blown factory and injecting that; I think I won't have the need for it that much and writing my own will let me get more feeling with the whole idea. – Rodi Mar 297 at 9:26.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.