Design Pattern (3-1), Differences between Singleton & Static Class

Note: this article is published on 07/02/2024.

These will be a series of articles about Design Patterns. We start from MVC Pattern:

• Design Pattern (0), Overview
• Design Pattern (1), MVC
• Design Pattern (2), MVVM
• Design Pattern (3), Singleton
  • Design Pattern (3-1), Differences between Singleton and Static Class --- this article
• Design Pattern (4), Desposal
• Design Pattern (5), Dependency Injection 
  • Design Pattern (5-1), Dependency Injection Implementation 
  • Design Pattern (5-2), Dependency Injection Types: Constructor, Property and Method
  • Design Pattern (5-3), Dependency Injection, Console Demo ​​​​​​
  • Design Pattern (5-4), Dependency Injection, MVC Demo 
    • Design Pattern (5-4-1), Dependency Injection, DbContext Register and Lifetime

Singleton and Static classes can only have one "copy" available in memory, and both classes can be used to maintain the global state of an application, however, there are many differences between them. This article will briefly discuss the differences.

A static class can be a singleton class

For example, the following VoteMachine class is a static class that acts as a singleton class to register the votes of users.

It will give the correct result in the multi-threaded scenario, as shown below.

Differences between Static class and Singleton class

References

• difference between static class and singleton class in c# - Google Search
• Static vs Singleton in C# (tutorialsteacher.com)
• Singleton vs Static Class. Singleton and Static classes can only… | by Henrique Siebert Domareski | Medium
• Singleton Vs Static Classes in C# (c-sharpcorner.com)