I’m performing some element UI hit testing like this:

internal MyElement[] HitTest((double x, double y) point, double scale) 
{
    ConcurrentBag<MyElement> geoms = new ConcurrentBag<MyElement>();

    var point = new Point { X = point.x, Y = point.y };

    Parallel.For(0,Output.Length, (d) =>
    {
        var element = UIElements[d];
        if (element is IHitTestable ht && ht.HitTest(ref point,scale) geoms.Add(element);
    });

    return geoms.ToArray();
}

I would like to refactor this to remove closures around local variables; also I believe that each iteration of the loop might be allocating anonymous stuff (classes,methods) per each iteration.

The issue is that the Parallel.For() parameters expect an Action<int> as a delegate to run in parallel, whereas I need a delegate Action<int,Point,double> to handle the local variables so that I can write a compile-time method with the expected argument types.

How do I provide Parallel.For() with an appropriate delegate without anonymity?