Singleton Pattern

A pattern that allows only one object of a class for the whole program.

What is Singleton Pattern?

The Singleton pattern makes sure a class has only one object for the whole program, like one shared settings object. Use it sparingly: it can make testing harder.

public sealed class AppSettings
{
    public static AppSettings Instance { get; } = new();
    private AppSettings() { }
}

Level: Freelancer · More OOP terms at this level

Updated September 27, 2026