📝 Originally published on Medium.
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Design patterns are one of the most debated topics in software engineering. Some developers swear by them; others avoid them like the plague. But the truth lies somewhere in the middle: design patterns are powerful tools — when used appropriately.
In the .NET ecosystem, especially with modern C# features and clean architecture practices, understanding when and why to use a pattern is more important than memorizing their structure.
This article is not another reference of the 23 Gang of Four patterns. Instead, we’ll focus on:
- What design patterns are in practical terms
- When they are actually useful in real-world .NET applications
- How to recognize overengineering
- Practical examples of patterns in C#
- A warning on when not to use them
🎯 What Is a Design Pattern?
A design pattern is a general, reusable solution to a commonly occurring problem in software design. It’s not a finished design or class you can copy-paste, but rather a template on how to solve a problem that can be adapted to your use case.
Design patterns can be classified into several categories:
- Creational Patterns
- Structural Patterns
- Behavioral Patterns
- Architectural Patterns
- Concurrency Patterns
- Integration Patterns
- Distribution Patterns
- Cloud Design Patterns
- Security Patterns
We’ll explore each of these categories in depth over time.
Why and When Should You Use Design Patterns?
Why:
- They provide a common language among developers.
- Proven solutions refined over years.
- Improve maintainability by reducing coupling and separating concerns.
- Enable scalability and flexibility (Open/Closed Principle).
- Facilitate SOLID principles.
When:
- You face a problem that maps directly to a known design pattern.
- You need to enforce separation of concerns or loose coupling.
- The project is growing in complexity.
- You must prepare your codebase for future changes.
- You need to vary behaviors dynamically at runtime.
Remember: not everything needs a pattern. Sometimes, a simple method or lambda expression is enough.
Thanks for Reading!
Read the original article on Medium for full context and more examples.
Follow me on Medium for the upcoming series exploring each design pattern category in detail.
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