C# Design Patterns-C# Design Patterns Guide

Example

Factory Method Pattern

Scenario

In an application that requires the creation of various types of documents (like Word, PDF, Excel), the Factory Method encapsulates the instantiation logic, allowing the addition of new document types without altering the client code that creates them.

Example

Singleton Pattern

Scenario

In a configuration manager component of an application, the Singleton pattern ensures that there is only one instance of the configuration manager, providing a global point of access and ensuring consistent configurations throughout the application.

Example

Observer Pattern

Scenario

In a weather monitoring application, the Observer pattern allows various display elements (current conditions, statistics display, forecast display) to update automatically when the weather data changes, without the weather data having to know the details of the display elements.

Example

Decorator Pattern

Scenario

In a graphical user interface library, the Decorator pattern allows for the dynamic addition of responsibilities to objects, such as adding borders or scrollbars to components, without changing the components' code.