Design Pattern

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Design Pattern (C# / Software Development)

Definition:

  • Reusable solution to common software design problems
  • Not actual code → it's a template / approach
  • Helps structure code in a clean, maintainable way

Purpose

  • Solve recurring design problems
  • Improve code reusability & maintainability
  • Provide standard best practices
  • Reduce code complexity
  • Improve communication between developers

Pros

  • Reusable solutions (no need to reinvent)
  • Cleaner architecture
  • Easier maintenance & scalability
  • Improves readability
  • Follows SOLID principles
  • Helps in large enterprise apps (like .NET Core APIs)

Cons

  • Over-engineering for small apps
  • Increases initial complexity
  • Learning curve (many patterns)
  • Wrong usage can make code worse
  • Adds extra abstraction layers

Types of Design Patterns (C# / .NET)

1. Creational Patterns

Definition:

  • Deal with object creation mechanisms
  • Control how objects are created

Purpose:

  • Encapsulate object creation logic
  • Reduce tight coupling
  • Improve flexibility in object creation

Examples:

  • Singleton
  • Factory
  • Abstract Factory
  • Builder

2. Structural Patterns

Definition:

  • Deal with class & object composition
  • How classes are structured and connected

Purpose:

  • Simplify complex structures
  • Improve code organization
  • Enable flexible relationships between objects

Examples:

  • Adapter
  • Decorator
  • Facade
  • Composite

3. Behavioral Patterns

Definition:

  • Deal with communication between objects
  • Focus on how objects interact

Purpose:

  • Improve communication flow
  • Reduce dependency between objects
  • Make behavior flexible and dynamic

Examples:

  • Strategy
  • Observer
  • Command
  • Mediator

Quick Summary Table

Creational Patterns: These patterns focus on how objects are created. Their main goal is to make object creation more flexible and efficient.

Structural Patterns: These patterns deal with how objects are organized or structured. They help simplify relationships between different parts of a system.

Behavioral Patterns: These patterns focus on how objects interact and communicate with each other. Their goal is to improve communication and responsibility between objects.

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