c# - How to decide which one should we choose to use MEF vs. any IoC? -

in scenario should use what? , in circumstances choose use both together?

tricky question - since 2 indeed overlap degree.

i this:

• use useful ioc if you're concerned dependency injection sake of decoupling components, e.g. ability able inject mock instead (for testing)

• use mef if you're more being extensible, e.g. able "load assemblies directory export interface", , if need extensible , open third parties (like visual studio: offer public api others can write extension app). mef shines

for mef , unity, there's mef , unity integration layer combine strengths of both tools together.

i recommend check out ayende's excellent blog post on differentiates mef ioc.