What different between IData< out T> and IData< T> ?
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consider,
class Fruit {}
class Banana : Fruit {}
interface ICovariantData<out T> {}
interface IData<T> {}
and the functions,
void Peel(IData<Fruit> fruitData) { }
void Peel(ICovariantData<Fruit> fruitData) { }
The function that accepts ICovariantData<Fruit> will be able to accept ICovariantData<Fruit> or ICovariantData<Bananna> because it is a covariant interface and Banana is a type of Fruit,
the function that accepts IData<Fruit> will only be able to accept IData<Fruit>.
Jodrell
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+1 for the simplest way of explanation – BRAHIM Kamel Dec 18 '13 at 14:35