Andrew Lock • 6/30/2026

Closed class hierarchies: Exploring the .NET 11 preview - Part 4

This article is part 4 of a series on .NET 11 preview features, focusing on closed class hierarchies. It explains what a closed class hierarchy is, how to define one using the 'closed' keyword, and how it restricts derivation to the same assembly. The post contrasts this with older approaches like private constructors, highlighting that closed hierarchies enable the compiler to perform exhaustiveness checking in switch expressions, improving code safety and domain modeling. It includes code examples and error messages.

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#assembly #c #Inheritance