Course Content
Course Overview
What are the course structure and learning goals. Why design patterns matter in real-world C#/.NET development? How to choose the right pattern in a scenario? How's the course structured and what are your learning goals?
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What Are Design Patterns?
Why They Matter in Real-World C#/.NET Development?
Course Structure and Learning Goals
The Source Code
Phase 1 – Foundations of Behavior
These patterns are intuitive, practical, and extremely common in .NET.
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Strategy Pattern
Decorator Pattern
Observer Pattern
Factory Method
Template Method
Phase 2 – Structural Thinking
Now we think about object relationships and architecture.
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Adapter Pattern
Facade Pattern
Composite Pattern
Proxy Pattern
Bridge Pattern
Phase 3 – Object Interaction & Responsibility Flow
We increase the abstraction level by introducing interaction between object and the flow of responsibilities.
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State Pattern
Command Pattern
Iterator Pattern
Chain of Responsibility Pattern
Mediator Pattern
Phase 4 – Object Creation Mastery
Creation patterns are conceptually harder for beginners because they require understanding dependency inversion.
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Abstract Factory Pattern
Builder Pattern
Prototype Pattern
Singleton Pattern
Phase 5 – Advanced / Specialized Patterns
These require strong abstraction maturity.
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Visitor Pattern
Memento Pattern
Flyweight Pattern
Interpreter Pattern
Bonus – Other Useful Patterns
These are some of the patterns you may need or encounter occasionally out there in the wild.
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Saga Pattern
Repository Pattern
Unit of Work Pattern
Specification Pattern
CQRS Pattern
Let’s Practice!
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Guess the Pattern
What Pattern Would You Apply?
Choosing Between Similar Patterns
Anti-Patterns and Pattern Misuse – Examples
Design Patterns - Final Quiz
Conclusion
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Summary of the Patterns We’ve Covered
Final Thoughts
C#/.NET Design Patterns: The Complete Guide

Real enterprise applications evolve. Requirements change, new modules appear, and dependencies grow.
Design Patterns give you a shared vocabulary and battle-tested structures to handle that evolution safely.

In practice, they help you:

Benefit Example in .NET
Reduce duplication Reuse object creation logic with a Factory.
Increase maintainability Replace behaviors with Strategy without changing callers.
Improve testability Inject mock dependencies via DI rather than hard-coding.
Enhance scalability Use CQRS or Saga for complex workflows.
Enable teamwork Every developer instantly understands a Repository or Unit of Work.

You’ll find patterns baked into .NET itself — from ILogger<T> lifetimes (Singleton/Factory) to IEnumerable (Iterator) and Middleware (Chain of Responsibility + Decorator).

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