AsyncLazy<T>

AsyncLazy.cs

/// <summary>
/// Async edition of <see cref="Lazy{T}"/>.
/// </summary>
/// <typeparam name="T">The type of the lazily initialized value</typeparam>
public class AsyncLazy<T> : Lazy<Task<T>>
{
	public AsyncLazy(Func<T> valueFactory)
		: base(() => Task.Run(valueFactory)) { }

	public AsyncLazy(Func<Task<T>> asyncValueFactory)
		: base(() => Task.Run(asyncValueFactory)) { }

	/// <summary>
	/// Gets a value that indicates whether a value has been created.
	/// </summary>
	public new bool IsValueCreated => base.IsValueCreated && Value.IsCompletedSuccessfully;

	/// <summary>
	/// Gets the value syncronously, if it is created. Otherwise returns <see langword="default"/>.
	/// </summary>
	public T? ValueOrDefault => IsValueCreated ? Value.Result : default;

	/// <summary>
	/// Gets an awaiter used to await the lazy value.
	/// </summary>
	public TaskAwaiter<T> GetAwaiter() => Value.GetAwaiter();
}