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I’m a bit confused about the usage of Abstract classes in C#. In C++, it makes sense to define a template which classes inheriting the abstract class can follow. But, in C# doesn’t Interface serve the same purpose?
True that abstract classes can have default implementation which is not provided by Interfaces. So if implementation doesn’t need to be included in base class, is it better to go for Interfaces?
I still like to provide a default abstract implementation of an interface, assuming it’s a substantial interface (and it makes sense). You never know when you might add something to the interface that has an easy default implementation that could be included and given “for free” to anyone who inherits from the abstract base class.