Co- and Contravariance
While most of the C# 4.0 set of language features deals with dynamic typing and simplifying interoperability scenarios, one other feature made it in to the language. Generic co- and contravariance is a powerful feature with a scary name. Luckily, you won’t have to deal with it directly that often. Instead, this new feature makes working with certain generic interfaces and delegates easier. Let’s have a look.
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