Is there a covariant interface for a Dictionary?

Asked Jan 11 '19 at 13:37

Active Jan 11 '19 at 13:37

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class Animal {}
class Bear : Animal {}

class Zoo
{
    IX<int, Animal> animals;
    Dictionary<int, Bear> bears;

    void Foo () 
    {
        animals = bears;
    }
}

Q Is there a covariant interface IX for a Dictionary<>?

asked Jan 11 '19 at 13:37

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IDictionary ? – Cihan Yakar Jan 11 '19 at 13:43
It's impossible. A dictionary is invariant. Check out e.g. [this answer](https://stackoverflow.com/a/12841831/2846483). – dymanoid Jan 11 '19 at 13:58

Is there a covariant interface for a Dictionary?

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