Implementation of Lazy for .NET 3.5

Question

.NET 4.0 has a nice utility class called System.Lazy that does lazy object initialization. I would like to use this class for a 3.5 project. One time I saw an implementation

Answer 1

If you don't need thread-safety, it's pretty easy to put one together with a factory method. I use one very similar to the following:

public class Lazy
{
    private readonly Func initializer;
    private bool isValueCreated;
    private T value;

    public Lazy(Func initializer)
    {
        if (initializer == null)
            throw new ArgumentNullException("initializer");
        this.initializer = initializer;
    }

    public bool IsValueCreated
    {
        get { return isValueCreated; }
    }

    public T Value
    {
        get
        {
            if (!isValueCreated)
            {
                value = initializer();
                isValueCreated = true;
            }
            return value;
        }
    }
}