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

© Vaskaran Sarcar 2018

V. SarcarDesign Patterns in C#https://doi.org/10.1007/978-1-4842-3640-6_20

20. State Pattern

Vaskaran Sarcar¹  

(1)

Whitefield, Bangalore, Karnataka, India

 

This chapter covers the State pattern.

GoF Definition

Allow an object to alter its behavior when its internal state changes. The object will appear to change its class.

Concept

The concept is best described by the following examples.

Real-Life Example

Consider the scenario of a network connection, say a TCP connection. An object can be in various states; for example, a connection might already be established, a connection might be closed, or the object has already started listening through the connection. When this connection receives a request from other objects, it responds as ...