Linq101-CustomSequence

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

 namespace Linq101
 {
     class CustomSequence
     {
         public void Linq98()
         {
             int[] vectorA = { , , , ,  };
             int[] vectorB = { , , , ,  };

             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;
         }
     }
 }