Pro EP 61: Liskov Substitution Principle of SOLID

LSP is third principle of SOLID , it is extension of open/close principle.

LSP says :-
- Derived class must be correctly substitutable for base class
- Subtypes must be substitutable for their base type (interface, class)
- Sub class should be able to replace objects of base class without affecting

LSP tell us how to use inheritance properly , if you see somewhere in your code NotImplementedException
then it is most probably violation of LSP.

Benefits of LSP:-
- Code reusability
- More maintainable code
- Better use of inheritance

Example
Bad:- A base class with some methods and sub classes throwing NotImplementedException for those methods it don’t need

Good:- A base class with some methods and sub classes implement those methods and those are needed as well

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