Creating Lazy<T> - Singleton Class

Mahadesh Mahalingappa
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Lazy<T> provides support for Lazy Initialization.

By Lazy Intialisation we mean that an object is not intialised until it is actually used. Below, I have shown how we can combine the Lazy<T> with the Singleton Pattern.

public sealed class LazySingleton
    {
        // Private object with lazy instantiation
        private static readonly Lazy<LazySingleton> instance =
            new Lazy<LazySingleton>(
                delegate
                {
                    return new LazySingleton();
                }
            //thread safety first
                , System.Threading.LazyThreadSafetyMode.ExecutionAndPublication);

        private LazySingleton()
        {
            // no public default constructor
        }

        // static instance property
        public static LazySingleton Instance
        {
            get { return instance.Value; }
        }
    }

Related Resources

Here is a list of some other related resources:

System.Lazy(Of T) Class

Lazy Initailization in .NET 4.0

Support for Lazy Initialization in .Net 4.0

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