The Difference Between Covariance and Contravariance in .NET C#by@ahmedtarekhasan
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The Difference Between Covariance and Contravariance in .NET C#

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Covariance and Contravariance were introduced by Microsoft in C# 6.0. They allow implicit reference conversion for array types, delegate types, and generic type arguments. Covariance preserves assignment compatibility and contravariance reverses it. Microsoft’s definition is different from what you would find in this story.
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