[editor-surveyor]

You’ve demonstrated far more than you realize.

[DevNet]

What does this do? IEnumerable data = ...; var q = ParallelEnumerable.Select( ParallelEnumerable.OrderBy( ParallelEnumerable.Where(data.AsParallel(), (x) => p(x)), (x) => k(x)), (x) => f(x)); foreach (var e in q) a(e);