OpenXml SAX方法

Question

我正在尝试使用SAX方法处理大型Excel文件。在我的场景中，用户将映射电子表格中的一些列，我们将根据单元格的位置和单元格的值从每行获取数据。

这个过程正在发挥作用，但我希望它花费更少的时间。看来我做错了吗？

        private string GetCellValue(Cell c, WorkbookPart workbookPart)
    {
        if (c.DataType != null && c.DataType == CellValues.SharedString)
        {
            return workbookPart.SharedStringTablePart.SharedStringTable.Elements<SharedStringItem>()
                .ElementAt(int.Parse(c.CellValue.InnerText)).Text.Text;

        }

        return c.CellValue != null ? c.CellValue.InnerText : string.Empty;

}

        private void ProcessDocument()
    {
        using (var spreadsheetDocument = SpreadsheetDocument.Open(model.FileName, false))
        {

            WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart;
            WorksheetPart worksheetPart = workbookPart.WorksheetParts.First();
            var reader = OpenXmlReader.Create(worksheetPart);

            while (reader.Read())
            {
                if (reader.ElementType != typeof(Row))
                {
                    continue;
                }

                rowCount++;
                reader.ReadFirstChild();
                var values = new ParcelValueImportValues();

                do
                {
                    if (reader.ElementType != typeof(Cell) || rowCount <= 1)
                    {
                        continue;
                    }

                    var c = (Cell)reader.LoadCurrentElement();
                    var location = GetCellLocation(c.CellReference);
                    var cellValue = GetCellValue(c, workbookPart);

                    if (location.Equals(hist.AssessmentRatio))
                    {
                        values.AssessmentRatio = cellValue;
                    }
                    else if (location.Equals(hist.AvImprovements))
                    {
                        values.AvImprovements = cellValue;
                    }
                    else if (location.Equals(hist.AvLand))
                    {
                        values.AvLand = cellValue;
                    }
                    else if (location.Equals(hist.FmvLand))
                    {
                        values.FmvLand = cellValue;
                    }
                    else if (location.Equals(hist.FmvImprovements))
                    {
                        values.FmvImprovements = cellValue;
                    }
                    else if (location.Equals(hist.ParcelNumber))
                    {
                        values.ParcelNumber = cellValue;
                    }

                } while (reader.ReadNextSibling());
            }
        }
    }