Singleton

Namespace: DesignPatterns.Creational

Attribute

[GenerateSingleton] on a sealed partial class with a parameterless constructor. The generator emits Lazy<T> backing and a static Instance property.

[GenerateSingleton]
public sealed partial class AppSettings
{
    public string AppName { get; init; } = "Demo";
}

// Generated: AppSettings.Instance

Diagnostics

• DP001 — type must be partial
• DP002 — invalid target shape

Sample

DesignPatterns.Samples.GenerateSingleton

Maintainer notes

Full design doc (中文): DesignPatterns/docs — see repository README for Singleton row in the patterns table.