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Self-study C#04 from scratch--Features and design principles

黄舟
黄舟Original
2017-02-04 10:37:541073browse

1. Three major features

Encapsulation: Hide internal implementation.
Inheritance: Reuse existing code.
Polymorphism: rewrite object behavior.

2. Design principles

  • ##Single Responsibility Principle(SRP)

A class has only one cause of it Reason for change.

  • Open-Close Principle (OCP):

Class modules should be extensible, but cannot be modified. (Open to extension development, closed to modifications)

  • Liskov Substitution Principle(LSP):

Subclasses can be anywhere Replace its base class.

  • Interface Segregation Principle (ISP):

Try to use interfaces with single functions instead of interfaces with complex and comprehensive functions .

  • Dependence Inversion Principle (DIP):

High-level modules should not depend on low-level modules, both should depend on abstraction . Abstractions should not depend on implementation details; implementation details should depend on abstractions.

  • Law of Demeter or Least Knowledge Principle(LOD orLKP):

Requires as much encapsulation as possible, as much as possible Independent, try to use low-level access modifiers.

  • Composition/Aggregation Reuse Principle (CARP):

If you only achieve the purpose of code reuse, try to use it Composition and aggregation, not inheritance.

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