Using Unfold to generate Fibonacci numbers

Example.cs

var fibNumbers = InfiniteUnfold(
    p => Tuple.Create(p.Item1, Tuple.Create(p.Item2, p.Item1 + p.Item2)),
    Tuple.Create(1, 1))
    .Take(50);

public IEnumerable<T> InfiniteUnfold<T, TResult>(
    Func<TResult, Tuple<T, TResult>> generator, 
    TResult seed)
{
    var next = seed;
    while (true)
    {
        var pair = generator(next);
        yield return pair.Item1;
        next = pair.Item2;
    }
}