private static void ReadLineFromSheet(WDBSheet sheetData, ISheet sheet)
        {
            logHandler?.Invoke(LogType.Info, string.Format(LogMessage.INFO_START_READ_LINE));

            int firstRowNum = readerExcelStyle.RowStartIndex + readerExcelStyle.FieldRowCount;
            int lastRowNum  = sheet.LastRowNum;

            int firstColNum = sheet.GetRow(readerExcelStyle.RowStartIndex).FirstCellNum;
            int lastColNum  = sheet.GetRow(readerExcelStyle.RowStartIndex).LastCellNum;

            bool isStart = false;

            for (int r = firstRowNum; r < lastRowNum; ++r)
            {
                IRow row = sheet.GetRow(r);
                if (row == null)
                {
                    logHandler?.Invoke(LogType.Info, string.Format(LogMessage.INFO_LINE_EMPTY, r));
                    continue;
                }
                string cellValue = GetCellStringValue(row.GetCell(firstColNum));
                if (string.IsNullOrEmpty(cellValue))
                {
                    if (!isStart)
                    {
                        continue;
                    }
                }
                else
                {
                    if (!isStart && cellValue == readerExcelStyle.LineStartFlag)
                    {
                        isStart = true;
                    }
                    else if (isStart && cellValue == readerExcelStyle.LineEndFlag)
                    {
                        isStart = false;
                        break;
                    }
                }

                WDBLine line = sheetData.AddLine(r);
                for (int c = firstColNum + 1; c < lastColNum; c++)
                {
                    WDBField field = sheetData.GetFieldAtCol(c);
                    if (field == null)
                    {
                        continue;
                    }
                    ICell valueCell = row.GetCell(c);
                    line.AddCell(c, GetCellStringValue(valueCell));
                }
                logHandler?.Invoke(LogType.Info, string.Format(LogMessage.INFO_CREATE_LINE, line));
            }

            logHandler?.Invoke(LogType.Info, LogMessage.INFO_END_READ_LINE);
        }