System.Data.DataTableReader.GetInt64 C# (CSharp) Метод

        public override long GetInt64(int ordinal)
        {
            ValidateState(nameof(GetInt64));
            ValidateReader();
            try
            {
                return (long)_currentDataRow[ordinal];
            }
            catch (IndexOutOfRangeException e)
            {
                // thrown by DataColumnCollection
                ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                throw ExceptionBuilder.ArgumentOutOfRange(nameof(ordinal));
            }
        }