.NET 4 equivalent of Task.WhenAll()

Question

In .NET 4, is there any functional equivalent to .NET 4.5\'s System.Threading.Tasks.Task.WhenAll()?

The goal is to wrap up multiple async tasks into a single one that is

Answer 1

Try waiting on Task.WaitAll() in another Task. Use the LINQ extension method ToArray to convert from IEnumerable to Task[].

Task WhenAll(IEnumerable tasks)
{
    return Task.Factory.StartNew(() => Task.WaitAll(tasks.ToArray()));
}