System.Data.DataTableReader.this C# (CSharp) Метод

        public override object this[int ordinal]
        {
            get
            {
                ValidateOpen("Item");
                ValidateReader();
                if ((_currentDataRow == null) || (_currentDataRow.RowState == DataRowState.Deleted))
                {
                    ReaderIsInvalid = true;
                    throw ExceptionBuilder.InvalidDataTableReader(_currentDataTable.TableName);
                }
                try
                {
                    return _currentDataRow[ordinal];
                }
                catch (IndexOutOfRangeException e)
                {
                    // thrown by DataColumnCollection
                    ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                    throw ExceptionBuilder.ArgumentOutOfRange(nameof(ordinal));
                }
            }
        }