What are design patterns and how are they used in C#

Design patterns are standard solutions to common software design problems. They provide a template for solving specific problems in software architecture, enabling developers to communicate effectively and implement best practices. In C#, these patterns help to create flexible and reusable code, improving code maintainability and scalability.

Commonly Used Design Patterns in C#

Some commonly used design patterns in C# include:

  • Singleton Pattern: Ensures a class has only one instance and provides a global point of access to it.
  • Factory Pattern: Creates objects without specifying the exact class of the object that will be created.
  • Observer Pattern: Defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified.
  • Decorator Pattern: Allows behavior to be added to individual objects, either statically or dynamically, without affecting the behavior of other objects from the same class.

Example: Singleton Pattern in C#

public class Singleton { private static Singleton _instance; private Singleton() {} public static Singleton Instance { get { if (_instance == null) { _instance = new Singleton(); } return _instance; } } }

design patterns C# singleton pattern factory pattern observer pattern decorator pattern software design

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