Question

I am trying to extract the values shared by two arraylist into another arraylist.

using System.Linq;

private ArrayList GetSameOf2AL(ArrayList first, ArrayList second)
        {
            ArrayList same = new ArrayList();

            var one = from int i in first select i;
            var two = from int i in second select i;

            var SameVal = one.Intersect(two);
            //I am supposed to convert or cast SameVal into arraylist here
            return same;
        }

My questions are:

1. I couldn’t convert the var type back into arraylist, can someone advise me how?
2. Did I choose a wrong method to do this at the first place? Your advise is appreciated.

Thank you all for your kind attention =)

Answer 1

List<int> intersection = first.Cast<int>().Intersect(second.Cast<int>()).ToList();

or

ArrayList intersection = new ArrayList();
foreach (var i in first.Cast<int>().Intersect(second.Cast<int>()))
    intersection.Add(i);