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Covariance, Contravariance and Invariance in C#

The rules for substituting derived class and base class in place of each other as a reference type
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Closed because this item is a copy of an existing article and does not provide adequate reference to the original. Reported by Kornfeld Eliyahu Peter, User 59241, Midi_Mick on Monday, May 22, 2017 9:19pm