What takes priority in StructureMap - For<T> or AddRegistry<T>? - dependency-injection

Question

I've got this type that's injected with an IFoo:
class MainThing
{
public MainThing(IFoo foo)
{
Console.WriteLine(foo.Name);
}
}
... and this interface:
interface IFoo
{
string Name { get; }
}
... and these two implementations of IFoo:
class Foo1 : IFoo
{
public string Name { get { return #"Foo1"; } }
}
class Foo2 : IFoo
{
public string Name { get { return #"Foo2"; } }
}
... and I've got this StructureMap registration:
var c = new Container(e =>
{
e.AddRegistry<Registry1>();
e.AddRegistry<Registry2>();
e.For<IFoo>().Use<Foo1>();
});
class Registry1 : Registry
{
public Registry1() { For<IFoo>().Use<Foo1>(); }
}
class Registry2 : Registry
{
public Registry2() { For<IFoo>().Use<Foo2>(); }
}
When I called c.GetInstance<MainThing>();, I was expecting MainThing to be given a Foo1 instance, but it's given a Foo2 instance.
The documentation says that subsequent AddRegistry calls overwrite the default instances declared in prior registries. I assumed that because I appended a .Use<Foo1> at the end, that it'd trump everything else before it, but it's not.
Here's WhatDoIHave():
===========================================================================================================
Configuration Sources:
0) Registry: StructureMap.ConfigurationExpression, StructureMap, Version=2.6.4.0, Culture=neutral, PublicKeyToken=e60ad81abae3c223
1) Registry: ConsoleApplication13.Registry1, ConsoleApplication13, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
2) Registry: ConsoleApplication13.Registry2, ConsoleApplication13, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
3) Registry: StructureMap.Configuration.DSL.Registry, StructureMap, Version=2.6.4.0, Culture=neutral, PublicKeyToken=e60ad81abae3c223
===============================================================================================================================================================================================================
PluginType Name Description
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Func`1<TResult> (Func`1<TResult>)
Scoped as: Transient
478e77e8-ff84-47e2-bdc1-b90bac2e7b61
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
IFoo (ConsoleApplication13.IFoo) f10f7750-f009-4842-ae35-7af47826ac2b Configured Instance of ConsoleApplication13.Foo2, ConsoleApplication13, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
Scoped as: Transient
9bd57a90-9c1e-4674-b249-7e6e96b40945 Configured Instance of ConsoleApplication13.Foo1, ConsoleApplication13, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
3e14df0c-da47-40e2-96ed-9bc6027a5da8 Configured Instance of ConsoleApplication13.Foo1, ConsoleApplication13, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
f10f7750-f009-4842-ae35-7af47826ac2b Configured Instance of ConsoleApplication13.Foo2, ConsoleApplication13, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
IContainer (StructureMap.IContainer) cb17947d-5814-4c9b-a219-f359333d6fdb Object: StructureMap.Container
Scoped as: Transient
cb17947d-5814-4c9b-a219-f359333d6fdb Object: StructureMap.Container
===============================================================================================================================================================================================================
Foo2
I can see there's 3 instances of IFoo and that Foo2 is the default, but I don't know why.
Does StructureMap give AddRegistry priority over For?

Answer 1

I think this is correct:
When I instantiate a new Container( e=> ... ), I get the default registry.
I then add two registries, of which both overwrite any configuration if the default registry.
I then change something in the default registry, but this has already been overwritten when adding Registry2.