Private static readonly is today the preferred way to create a singleton in C#, but it don't have much laziness. You can implement it with a nested class, but with C#4 you can directly use the System.Lazy<T> class. Here is the model of the implementation:

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

    public static Singleton Instance { get { return lazy.Value; } }

    private Singleton()
    {
    }
}

Published under: Microsoft .NET Tips ·  ·  ·  ·