Enterprise Application Architecture with .NET Core

The singleton pattern

The singleton pattern is perhaps the most common pattern used by developers across the globe. This pattern basically defines a class for which only one (single) instance can exist.

You can have a class that is either global or static with all static methods so that you do not need to create any instance of this class and use it directly. This is okay but not considered a best practice generally, unless you are defining a stateless interface to expose an underlying OS APIs, such as subset win32 APIs or a native DLL or system library exposing its one-off APIs.

Singleton - If you want to have a stateful class whose only one instance should exist in the given software, then what you need is a singleton class. An example ...