Design Patterns

A collection of design patterns implemented in C# with clean examples and detailed explanations.

📚 Patterns Catalog

Creational Patterns

1. Singleton Pattern: Ensures a class has only one instance while providing global access. Ideal for configuration managers and logging systems.
2. Factory Method Pattern: Defers object creation to subclasses while maintaining a common interface. Enables flexible object generation.
3. Abstract Factory Pattern: Creates families of related objects without specifying concrete classes. Perfect for cross-platform UI toolkits.
4. Builder Pattern: Constructs complex objects step-by-step. Useful for creating objects with many optional components.
5. Prototype Pattern: Creates new objects by cloning prototypes. Efficient for expensive object initialization.

Structural Patterns

6. Adapter Pattern: Bridges incompatible interfaces. Commonly used in legacy system integration.
7. Decorator Pattern: Adds responsibilities to objects dynamically. Alternative to subclassing for extending functionality.
8. Facade Pattern: Provides simplified interface to complex subsystems. Reduces subsystem dependencies.
9. Composite Pattern: Treats individual objects and compositions uniformly. Ideal for tree-structured hierarchies.
10. Proxy Pattern: Controls access to another object. Used in lazy loading and access control.
11. Flyweight Pattern: Minimizes memory usage through object sharing. Effective for large quantities of similar objects.
12. Bridge Pattern: Decouples abstraction from implementation. Enables independent variation of both.

Behavioral Patterns

13. Memento Pattern: Captures and restores object state. Essential for undo/redo functionality.
14. State Pattern: Encapsulates state-specific behavior. Manages object behavior changes during runtime.
15. Iterator Pattern: Provides sequential access to collection elements. Abstracts traversal logic.
16. Strategy Pattern: Encapsulates interchangeable algorithms. Enables runtime algorithm selection.
17. Template Method Pattern: Defines algorithm skeleton with customizable steps. Promotes code reuse.
18. Command Pattern: Encapsulates requests as objects. Enables queuing and undo operations.
19. Observer Pattern: Implements publish-subscribe mechanism. Maintains consistency between related objects.
20. Mediator Pattern: Centralizes complex communication between objects. Reduces direct dependencies.
21. Chain of Responsibility: Passes requests through handler chain. Achieves loose coupling in request processing.
22. Visitor Pattern: Separates algorithms from object structures. Enables adding new operations without changing classes.
23. Composite Pattern: (Note: Composite appears in both Structural and Behavioral categories based on usage context)

🛠 Usage

Each pattern includes:

• Problem statement
• Pattern solution
• C# implementation
• Usage examples
• Mermaid class diagrams
• Key benefits and considerations

# Clone repository
git clone https://github.com/hsynkmk/Design-Patterns.git

📖 Prerequisites

• Basic understanding of object-oriented programming
• Familiarity with C# syntax
• Visual Studio or VS Code (recommended)

🤝 Contributing Contributions welcome! Please:

1. Fork the repository
2. Create your feature branch
3. Commit your changes
4. Push to the branch
5. Open a pull request