使用 SAX 方法和 Open XML SDK 读取大型 Excel 文档的最可靠方法

Question

I have two methods of parsing a large Excel document using the SAX approach with the Open XML SDK.

Between the two examples below, which will be most reliable for larger files?

1. Load current cell using Reader object and iterate checking ReadNextSibling() is true

using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(filename, false))
{
    WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart;
    Sheet sheet = workbookPart.Workbook.Descendants<Sheet>().Where(s => s.Name == "Sheet1").FirstOrDefault();
    WorksheetPart worksheetPart = (WorksheetPart)workbookPart.GetPartById(sheet.Id);
    
    OpenXmlReader reader = OpenXmlReader.Create(worksheetPart);

    while (reader.Read())
    {
        if (reader.ElementType == typeof(Row))
        {
            reader.ReadFirstChild();
            do
            {
                if (reader.ElementType == typeof(Cell))
                {
                    Cell cell = (Cell)reader.LoadCurrentElement();
                }
            } while (reader.ReadNextSibling());
        }
    }
}

2. Load current Row using reader object and iterate over child Elements

using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(filename, false))
{
    WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart;
    Sheet sheet = workbookPart.Workbook.Descendants<Sheet>().Where(s => s.Name == "Sheet1").FirstOrDefault();
    WorksheetPart worksheetPart = (WorksheetPart)workbookPart.GetPartById(sheet.Id);
    
    OpenXmlReader reader = OpenXmlReader.Create(worksheetPart);

    while (reader.Read())
    {
        if (reader.ElementType == typeof(Row))
        {
            Row row = (Row)reader.LoadCurrentElement();

            foreach (OpenXmlElement element in row.ChildElements)
            {
                Cell cell = (Cell)element;
            }
        }
    }
}

The 1st example is using the reader each time to load the current Cell element.

The 2nd example is a hybrid approach because the Row is in memory while being parsed and the cell is in the collection of child elements ready to be parsed.