Object-Oriented Programming
Overview
This section covers the foundational principles of Object-Oriented Programming and how they apply to C# and .NET development.
Contents
Core OOP Concepts
- OOP, SOLID & Patterns Comprehensive Guide
- Four Pillars of OOP (Abstraction, Encapsulation, Inheritance, Polymorphism)
- SOLID Principles with Real-World Examples
- Common Design Pattern Applications
Quick Reference
Four Pillars of OOP
| Pillar | Description | C# Implementation |
|---|---|---|
| Abstraction | Hide complexity, show essentials | Abstract classes, interfaces |
| Encapsulation | Bundle data + methods, control access | Access modifiers, properties |
| Inheritance | Create hierarchies, share behavior | Class inheritance, interface implementation |
| Polymorphism | Same interface, different implementations | Virtual/override, interfaces |
SOLID Principles
| Principle | Meaning | Key Benefit |
|---|---|---|
| S - Single Responsibility | One class, one reason to change | Maintainability |
| O - Open/Closed | Open for extension, closed for modification | Extensibility |
| L - Liskov Substitution | Subtypes replaceable for base types | Reliability |
| I - Interface Segregation | Many specific interfaces > one general | Flexibility |
| D - Dependency Inversion | Depend on abstractions, not concretions | Testability |
Learning Path
- Beginner: Understand the four pillars with simple examples
- Intermediate: Apply SOLID principles to refactor code
- Advanced: Combine OOP with design patterns for scalable architecture
Related Topics
- Design Patterns - GoF patterns implementing OOP
- Clean Architecture - OOP in architecture
- DDD - Domain modeling with OOP