Heyho,
There´s a question in my mind for some time now, which hopefully can be cleared quickly by some of you:
I am a big fan of MVC, ASP.Net Mvc in my case.
What I have noticed is the hype about interfaces. Every video, tutorial and book seems to solve any kind of abstraction with interfaces. I have adapted these patterns, understood why and how and I am basically very happy with it.
But I just don´t get why interfaces are used everywhere. I´ve almost never seen some abstraction being done with abstract base classes, which I don´t understand. Maybe I miss something? I know that you can only inherit from one base class while multiple interfaces are possible. But interfaces do have disadvantages, especially when some changes need to be done, which breaks your implementations. In my projects so far, I only used to pick interfaces for completely different classes.
For example, the whole repository pattern could be done with an abstract base class, still providing testability and exchangeability, or did I miss something?
Please point me to the part where my brain laggs :)