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

        private Range GetBinaryFilteredRecords()
        {
            if (_matchedCandidates == 0)
            {
                return new Range(0, _index.RecordCount - 1);
            }
            Debug.Assert(_matchedCandidates <= _index._indexFields.Length, "GetBinaryFilteredRecords : Invalid Index");
            int lo = FindFirstMatchingRecord();
            if (lo == -1)
            {
                return new Range();
            }
            int hi = FindLastMatchingRecord(lo);
            Debug.Assert(lo <= hi, "GetBinaryFilteredRecords : Invalid Search Results");
            return new Range(lo, hi);
        }