Linq101-CustomSequence

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

namespace Linq101
{
    class CustomSequence
    {
        public void Linq98()
        {
            int[] vectorA = { 0, 2, 4, 5, 6 };
            int[] vectorB = { 1, 3, 5, 7, 8 };

            int result = vectorA.Combine(vectorB, (a, b) => a * b).Sum();
            Console.WriteLine(result);
        }
    }

    public static class CustomSequenceOperators
    {
        public static IEnumerable<int> Combine(this IEnumerable<int> first, IEnumerable<int> second, Func<int, int, int> func)
        {
            //List<int> list=new List<int>();
            using (IEnumerator<int> e1 = first.GetEnumerator(), e2 = second.GetEnumerator())
            {
                while (e1.MoveNext() && e2.MoveNext())
                {
                    yield return func(e1.Current, e2.Current);
                    //list.Add(func(e1.Current, e2.Current));
                }
            }
            //return list;
        }
    }
}