10. The Liskov Substitution Principle (LSP)
© Jennifer M. Kohnke
The primary mechanisms behind the Open/Closed Principle are abstraction and polymorphism. In statically typed languages, such as C#, one of the key mechanisms that supports abstraction and polymorphism is inheritance. It is by using inheritance that we can create derived classes that implement abstract methods in base classes.
What are the design rules that govern this particular use of inheritance? What are the characteristics of the best inheritance hierarchies? What are the traps that will cause us to create hierarchies that do not conform to OCP? These are the questions addressed ...
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