{
  "id": 18874333,
  "title": "Singleton — Design Patterns (GoF + Enterprise) in C#",
  "url": "https://urgent.news/2026/11/08/singleton-design-patterns-gof-enterprise-in-c",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-11-08T06:11:14.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/divakarupadhyay/singleton-design-patterns-gof-enterprise-in-c-1bnp"
  },
  "original_language": "en",
  "account": "A Singleton class guarantees only one instance of itself, providing a global point of access to that instance. To ensure thread safety and lazy initialization in C#, implement a sealed class with a private constructor and a static readonly Lazy instance. The Lazy<T> class is thread-safe by default and handles both construction and publication of the instance. Alternatives include a static readonly field for thread safety, or double-checked locking with volatile keyword for performance. In ASP.NET Core, utilize services.AddSingleton<T> to manage the Singleton's lifetime and enable testing. Factory Method and Abstract Factory are two design patterns that create objects. Factory Method defines a method within a class to return a product object, typically allowing subclasses to determine the exact concrete class to instantiate. Abstract Factory, on the other hand, provides a set of interfaces for creating families of related or dependent objects without specifying their concrete classes, using composition instead of inheritance.",
  "summary": "Lesson 1 of 18 in the free Design Patterns (GoF + Enterprise) in C# course on DevLadder. Ensure a class has one instance with a global access point. // Thread-safe, lazy Singleton public sealed class AppConfig { private static readonly Lazy < AppConfig > _instance = new (() => new AppConfig ()); public static AppConfig Instance => _instance . Value ; private AppConfig () { /* load settings once…",
  "key_points": [
    "Singleton ensures single instance with global access in C#",
    "Implement sealed class, private constructor, Lazy<T> for thread safety",
    "ASP.NET Core uses services.AddSingleton T for Singleton management"
  ],
  "editors_take": "Mastering these creational patterns allows developers to manage object lifecycles and dependencies more effectively, shifting the burden of instantiation from manual implementation to structured architectural frameworks.",
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}