From 0 self-study c#04--characteristics and design principles

1. Three major features

Encapsulation: hides the internal implementation.
Inheritance: Reusing existing code.
Polymorphic: Overrides object behavior.

2. Design principles

• Single-duty principle Responsibility Principle (SRP)

A class has only one cause that causes it to change.

• Opening and closing principle Open-close Principle (OCP):

The class module should be extensible, but not modifiable. (for extended development, closed for modification)

• Richter Replacement principle Liskov Substitution Principle (LSP):

A subclass can replace its base class anywhere.

• Interface Isolation principle Interface segregation Principle (ISP):

Try to use a single, functional interface without using a complex, comprehensive interface.

• Dependency inversion principle dependence inversion Principle (DIP):

High-level modules should not be dependent on lower-layer modules, both of which should be dependent on abstraction. Abstractions should not be dependent on implementation details, and implementation details should be dependent on abstraction.

• Dimitri principle/least-knowledge principle law of Demeter or Least knowledge Principle (LOD ORLKP):

Requires as much encapsulation as possible to be as independent as possible, using a low-level access modifier.

• Combination/Aggregation multiplexing principle composition/aggregation reuse Principle (CARP):

If you are only trying to achieve the purpose of code reuse, use combinations and aggregations instead of inheritance.

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