System.Collections.CompatibleComparer.Compare C# (CSharp) Method

        public int Compare(Object a, Object b) {
            if (a == b) return 0;
            if (a == null) return -1;
            if (b == null) return 1;
            if (_comparer != null)
                return _comparer.Compare(a,b);
            IComparable ia = a as IComparable;
            if (ia != null)
                return ia.CompareTo(b);

            throw new ArgumentException(Environment.GetResourceString("Argument_ImplementIComparable"));
        }