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[C# 15-Tutorials]: New Feature - closed type hierarchies #54015

@BillWagner

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@BillWagner

.NET 11 Preview

.NET 11 Preview 5

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New behavior

This should teach the reader what kind of hierarchies are suitable for closed classes.

It should teach when to use sealed on the derived classes in the same assembly, and when to leave an "escape hatch" so other assemblies have a path to derive new cases.

New tutorials

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Associated WorkItem - 582355

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