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Asked: 2026-05-15T04:30:00+00:00

I am just getting into MEF and was wondering how you could define the

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I am just getting into MEF and was wondering how you could define the order of collection exported with [ImportMany]?

What I mean here is if I had two classes (Class1, Class2) that implement the interface IService and each of the implementations are in two different libraries (although they could be in the same), I want the Class2 instance to be created before the Class1 instance in the IEnumerable collection defined by the ImportMany attribute. So it is like a pipeline of functionality where Class2 calls are made before Class1 calls.

Also, I have an another Class (Class3 which also implements IService) in another library, which I want introduced later on (i.e. some logging utility), how do I make this the 3rd instance in the ImportMany collection?

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1 Answer

  1. Editorial Team

    You’ll could ‘Lazy’ load them first and then check an order attribute as you add them to a collection.

    Or check out this answer which has an example of exacly what you’re trying to do.

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