Tests.CompareObjects.CompareIList C# (CSharp) Method

        void CompareIList(object object1, object object2, string breadCrumb)
        {
            IList ilist1 = object1 as IList;
            IList ilist2 = object2 as IList;

            if (ilist1 == null) //This should never happen, null check happens one level up
                throw new ArgumentNullException("object1");

            if (ilist2 == null) //This should never happen, null check happens one level up
                throw new ArgumentNullException("object2");

            try
            {
                _parents.Add(object1);
                _parents.Add(object2);

                //Objects must be the same length
                if (ilist1.Count != ilist2.Count)
                {
                    Differences.Add(string.Format("object1{0}.Count != object2{0}.Count ({1},{2})", breadCrumb,
                        ilist1.Count, ilist2.Count));

                    if (Differences.Count >= MaxDifferences)
                        return;
                }

                IEnumerator enumerator1 = ilist1.GetEnumerator();
                IEnumerator enumerator2 = ilist2.GetEnumerator();
                int count = 0;

                while (enumerator1.MoveNext() && enumerator2.MoveNext())
                {
                    string currentBreadCrumb = AddBreadCrumb(breadCrumb, string.Empty, string.Empty, count);

                    Compare(enumerator1.Current, enumerator2.Current, currentBreadCrumb);

                    if (Differences.Count >= MaxDifferences)
                        return;

                    count++;
                }
            }
            finally
            {
                _parents.Remove(object1);
                _parents.Remove(object2);
            }
        }