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ArrayList and Linq

If you import the System.Linq namespace, you can convert an ArrayList to a generic List by calling Cast and then ToList:

 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

class Sample
{
    public static void Main()
    {
        ArrayList al = new ArrayList();
        al.AddRange(new[] { 1, 5, 9 });
        List<int> list = al.Cast<int>().ToList();
        
        foreach(int i in list){
           Console.WriteLine(i);
        }
    }

}

The output:


1
5
9
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