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Design Patterns in C#

A comprehensive guide to design patterns in C#, inspired by the Gang of Four (GoF) book. This repository contains documentation and minimalistic code samples demonstrating each design pattern.

Repository Structure

The patterns are organized into three main categories:

Creational Patterns

Patterns that deal with object creation mechanisms.

  • Singleton - Ensures a class has only one instance
  • Factory Method - Creates objects without specifying exact classes
  • Abstract Factory - Creates families of related objects
  • Builder - Constructs complex objects step by step
  • Prototype - Creates new objects by copying existing ones

Structural Patterns

Patterns that deal with object composition and relationships.

  • Adapter - Allows incompatible interfaces to work together
  • Bridge - Separates abstraction from implementation
  • Composite - Composes objects into tree structures
  • Decorator - Adds behavior to objects dynamically
  • Facade - Provides a simplified interface to a complex system
  • Flyweight - Shares common state between multiple objects
  • Proxy - Provides a surrogate or placeholder for another object

Behavioral Patterns

Patterns that deal with object collaboration and responsibility.

  • Chain of Responsibility - Passes requests along a chain of handlers
  • Command - Encapsulates a request as an object
  • Iterator - Accesses elements of a collection sequentially
  • Mediator - Defines how objects interact
  • Memento - Captures and restores an object's state
  • Observer - Notifies multiple objects about state changes
  • State - Alters object behavior when its state changes
  • Strategy - Defines a family of interchangeable algorithms
  • Template Method - Defines the skeleton of an algorithm
  • Visitor - Separates algorithms from objects they operate on

How to Use

Each pattern directory contains:

  • README.md - Documentation explaining the pattern
  • A minimalistic C# application demonstrating the pattern

Requirements

These samples are built with:

  • .NET 10 - The latest LTS release with enhanced runtime performance
  • C# 14 - Featuring new language improvements including:
    • field keyword for cleaner property implementations
    • Null-conditional assignment (?.=)
    • Extension members and improved Span<T> support
    • Enhanced lambda expressions

To run the samples, install the .NET 10 SDK.

Contributing

Feel free to contribute by adding more examples or improving existing documentation.