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How do you implement a thread-safe singleton in C#?

ICSM Computer 723 22 Jun 2025

Ask by ICSM Computer

Updated 22 Jun 2025

1 Answers

ICSM Computer 22 Jun 2025

Answer:

public sealed class Singleton {
    private static readonly Lazy<Singleton> _instance = new(() => new Singleton());

    public static Singleton Instance => _instance.Value;

    private Singleton() { }
}

Uses Lazy<T> to ensure thread-safe, lazy initialization.
Better than double-checked locking or static constructors in most cases.

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