As an object-oriented language, c# supports the three core principles of object-oriented programming:

  • Encapsulation - Hide implementation details in a class from users of the class, exposing only a public interface
  • Inheritance - Derive a subclass from a parent class, inheriting data and behavior from the parent, in an "is-a" relationship. Inheritance defines a hierarchy of classes. All classes ultimately inherit from System.Object.
  • Polymorphism - Any subtype may be used where a parent type (or type higher up in the class hierarchy) is expected. Conversely, a variable of a particular class will be treated as the apporiate subclass.

原文地址：#229 - The Core Principles of Object-Oriented Programming

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