Editing Double-checked locking (section)

== Usage in C# ==

In .NET Framework 4.0, the <code>Lazy&lt;T&gt;</code> class was introduced, which internally uses double-checked locking by default (ExecutionAndPublication mode) to store either the exception that was thrown during construction, or the result of the function that was passed to <code>Lazy&lt;T&gt;</code>:<ref>{{cite book
 |title=C# 4.0 in a Nutshell
 |last=Albahari
 |first=Joseph
 |isbn=978-0-596-80095-6
 |year=2010
 |publisher=O'Reilly Media
 |chapter=Threading in C#: Using Threads
 |chapter-url=http://www.albahari.com/threading/part3.aspx#_LazyT
 |quote=<code>Lazy&lt;T&gt;</code> actually implements […] double-checked locking. Double-checked locking performs an additional volatile read to avoid the cost of obtaining a lock if the object is already initialized.
}}</ref>

<syntaxhighlight lang="csharp">
public class MySingleton
{
    private static readonly Lazy<MySingleton> _mySingleton = new Lazy<MySingleton>(() => new MySingleton());

    private MySingleton() { }

    public static MySingleton Instance => _mySingleton.Value;
}
</syntaxhighlight>