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A comment on Performance Tuning for .NET Core. Parent comment

Re:Performance Tuning for .NET Core by maxxxxx on Tuesday January 15, 2019 @03:20PM (#18914665)
I have never inherited from a class from a library unless it was specifically designed that way. I think it's much better to aggregate.

Makes me wonder: Can you add extension methods to sealed classes?

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Re:Performance Tuning for .NET Core by benaadams on Tuesday January 15, 2019 @04:59PM (#18915872)
Yes; extension methods just operate over the public interface
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