IoC - Multiple implementations support for a single interface

Question

I am wondering why .Net IoC containers do not easily support multiple implementations for a single interface! May be I am wrong, but as far I have seen, frameworks like Nin

Answer 1

My container Griffin.Container supports it.

registrar.RegisterConcrete();
registrar.RegisterConcrete();

And to fetch:

var services = container.Resolve();

However, you can't get one specific implementation. It's a design decision. It's much better to register a factory in the container if have to get a specific implementation. Read more here in the best practices section.

Griffin.Container can be found at github: https://github.com/jgauffin/griffin.container