Design Patterns

Collection of 23 Gang of Four design patterns implementations in C#. Done mainly for learning purposes but feel free to use them however you want.

Behavioral patterns

Define the ways of communication between objects.

• Chain of Responsibility - handles data by passing it between objects in the chain
• Command - encapsulates command/request into separate class
• Interpreter - executes expressions
• Iterator - sequental access to the elements in the collection
• Mediator - communication between objects using separate class
• Memento - saves and restores object state
• Observer - notifies objects about some event
• State - alters class behaviour
• Strategy - encapsulates algorithms to the separate classes
• Template Method - overrides (by creating subclasses) steps of the algorithm
• Visitor - adds new operation to the class without its change

Creational patterns

Define the ways of creating objects using hidden logic instead of directly new keyword use.

• Abstract Factory - creates instances of the specified class family
• Builder - constructs instances with a few steps
• Factory Method - creates instances of the derived classes
• Prototype - creates instance by copying or cloning other object
• Singleton - ensures that there is only one instance of the class

Structural patterns

Define the ways of composing objects and classes to add or change functionality.

• Adapter - matches interfaces of different classes
• Bridge - separates interface from its implementation
• Composite - composes object using tree structure
• Decorator - adds new responsibilities to the existing class
• Facade - class representing a few subsystems
• Flyweight - small and reusable objects
• Proxy - controlls the access to the object