Question

I’m looking into using a IOC container but I’m working with legacy code and there are loads of CreateInstance‘s everywhere and then things done with that class.

Is there a way I can get a IOC container to return a list of classes it has instantiated so the methods currently in use can continue doing their thing just without the CreateInstance

For example Autofac will scan an assembly/set of assemblies with code similar to the below, I was just wondering if it can return a List<T> of the classes it has created.

var dataAccess = Assembly.GetExecutingAssembly();

builder.RegisterAssemblyTypes(dataAccess)
    .Where(t => t.Name.EndsWith("Repository"))
    .AsImplementedInterfaces();

UPDATE: I’m just deciding on which IOC to use but need the above functionality to tell me at what classes have been instantiated.

Answer 1

You mean something like

var classes = _container.Resolve<IEnumerable<YourClassType>>().ToList();

The above syntax works as long as all classes that derive YourClassType has been been registered as it.

_container.Resolve<IEnumerable<T>>() tells autofac to resolve all classes that implement T.