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Asked: 2026-05-10T14:40:47+00:00

Maybe the need to do this is a ‘design smell’ but thinking about another

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Maybe the need to do this is a ‘design smell’ but thinking about another question, I was wondering what the cleanest way to implement the inverse of this:

foreach(ISomethingable somethingableClass in collectionOfRelatedObjects) {   somethingableClass.DoSomething(); }

i.e. How to get/iterate through all the objects that don’t implement a particular interface?

Presumably you’d need to start by upcasting to the highest level:

foreach(ParentType parentType in collectionOfRelatedObjects) {   // TODO: iterate through everything which *doesn't* implement ISomethingable  }

Answer by solving the TODO: in the cleanest/simplest and/or most efficient way

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1 Answer

  1. this should do the trick:

    collectionOfRelatedObjects.Where(o => !(o is ISomethingable))
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