Design Patterns in C#: A Hands-on Guide with Real-world Examples

© Vaskaran Sarcar 2020

V. SarcarDesign Patterns in C#https://doi.org/10.1007/978-1-4842-6062-3_7

7. Decorator Pattern

Vaskaran Sarcar¹ 

(1)

Garia, Kolkata, West Bengal, India

 

This chapter covers the Decorator pattern.

GoF Definition

Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.

Concept

From the GoF definition, it is evident that this pattern uses an alternative to subclassing (i.e., inheritance). If inheritance is not allowed, how do you proceed? Yes, you guessed it right. It prescribes you to use composition instead of inheritance.

By following the SOLID principle, this pattern promotes the concept where your class is closed for modification but open for ...