allow multiple registrations with Last In First Out

[dansiegel]

Description of Change

Changes default behavior for DryIoc to retain multiple registrations for a given service. Given the following code:

containerRegistry.Register<IFoo, FooA>();
containerRegistry.Register<IFoo, FooB>();

Prism has always and will continue to expect that when we call Resolve<IFoo>() a new instance of FooB should be returned by the container.

As documented in the original Prism.Container.Extensions issue, a developer may which to resolve IEnumerable<IFoo>() such as with Shiny in which Shiny does a ResolveAll<T> to return an IEnumerable<T> for any delegates that were registered. This change now allows the container to retain each registration to return the IEnumerable with an instance from each registration when IEnumerable<T> is resolved, and continue to return the last registration when T is resolved.

Bugs Fixed

• Register / Resolve T or IEnumerable<T> dansiegel/Prism.Container.Extensions#124

API Changes

None

Behavioral Changes

Given the above code:

var single = Container.Resolve<IFoo>(); // Resolves FooB
var all = Container.Resolve<IEnumerable<IFoo>>(); // Returns an enumerable with an instance for both FooA and FooB

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of master at time of PR
• Changes adhere to coding standard