Question

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Enum type constraints in C#

Could somebody kindly explain to me with a simple sample and simple words why enum constraints are not allowed on a generic type i.e. What would happen if they were possible?

Answer 1

Simply put: because they’re not. That’s how the language is designed (you wanted simple, right? 🙂 )

enum is a value type, so you could put a restraint on your generic type where T : struct and use Type.IsEnum to check in the constructor, throwing an exception if it returns false.