WCF, IoC, DI

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C#

WCF

C#4.0

Hello!
I want to know opinion developers who have had work with WCF. Saying IoC I mean something like Unity, Spring.Net or another one.

1. It's good or not to use(IoC and DI) to create service instance?
When it's really need?

2. Wouldn't be better implements IInstanceProvider then IoC?
If would when and why?

In my case I want to use Repository pattern and inject it to my service,
how better to do it?