Any IOC framework to recommend under c# 4.0? [closed]

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I am wondering if anyone can recommend IOC framework which can work under c# 4.0? Also, does .Net framework 4.0 natively support IOC?

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Scott Hanselman has a list of .Net IOC/Dependency injection tools here:

http://www.hanselman.com/blog/ListOfNETDependencyInjectionContainersIOC.aspx

and there are some good feature charts to be found here:

http://code.google.com/p/net-ioc-frameworks/wiki/Charts

Otherwise it's simply down to requirement & personal preference (Ninject/StructureMap in my case!)

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MEF can be used as an IoC and is part of the .Net 4 framework.