System.Data.Select.CompareRecords C# (CSharp) Метод

        private int CompareRecords(int record1, int record2)
        {
            int lenIndexDesc = _indexFields.Length;
            for (int i = 0; i < lenIndexDesc; i++)
            {
                int c = _indexFields[i].Column.Compare(record1, record2);
                if (c != 0)
                {
                    if (_indexFields[i].IsDescending) c = -c;
                    return c;
                }
            }

            long id1 = _table._recordManager[record1] == null ? 0 : _table._recordManager[record1].rowID;
            long id2 = _table._recordManager[record2] == null ? 0 : _table._recordManager[record2].rowID;
            int diff = (id1 < id2) ? -1 : ((id2 < id1) ? 1 : 0);

            // if they're two records in the same row, we need to be able to distinguish them.
            if (diff == 0 && record1 != record2 &&
                _table._recordManager[record1] != null && _table._recordManager[record2] != null)
            {
                id1 = (int)_table._recordManager[record1].GetRecordState(record1);
                id2 = (int)_table._recordManager[record2].GetRecordState(record2);
                diff = (id1 < id2) ? -1 : ((id2 < id1) ? 1 : 0);
            }

            return diff;
        }