System.Collections.SortedList.SortedList C# (CSharp) Method

        public SortedList(IDictionary d, IComparer comparer)
            : this(comparer, (d != null ? d.Count : 0))
        {
            if (d == null)
                throw new ArgumentNullException(nameof(d), SR.ArgumentNull_Dictionary);
            Contract.EndContractBlock();
            d.Keys.CopyTo(_keys, 0);
            d.Values.CopyTo(_values, 0);

            // Array.Sort(Array keys, Array values, IComparer comparer) does not exist in System.Runtime contract v4.0.10.0.
            // This works around that by sorting only on the keys and then assigning values accordingly.
            Array.Sort(_keys, comparer);
            for (int i = 0; i < _keys.Length; i++)
            {
                _values[i] = d[_keys[i]];
            }
            _size = d.Count;
        }