How to define data type?

Question

I have to create a big XLSX file. I use OpenXmlWriter to do the task as fast as possible. The file is properly create, but i can't change the data type of the field. It's always standard type, and i would like to use number format for some of them.

I have tried many way but no one worked (Cell DataType, with the attribute,...).

Here is an example :

SpreadsheetDocument fichier_excel = SpreadsheetDocument.Create(chemin + NomFichier, SpreadsheetDocumentType.Workbook);

fichier_excel.AddWorkbookPart();
WorksheetPart wsp = fichier_excel.WorkbookPart.AddNewPart<WorksheetPart>();

OpenXmlWriter writer = OpenXmlWriter.Create(wsp);
writer.WriteStartElement(new Worksheet());
writer.WriteStartElement(new SheetData());

oxa = new List<OpenXmlAttribute>();
oxa.Add(new OpenXmlAttribute("r", null, "1"));
writer.WriteStartElement(new Row(), oxa);

oxa = new List<OpenXmlAttribute>();
oxa.Add(new OpenXmlAttribute("t", null, "str"));
writer.WriteStartElement(new Cell(), oxa);
writer.WriteElement(new CellValue("10001"));
writer.WriteEndElement();

writer.WriteEndElement();

writer.WriteEndElement();

writer.Close();

writer = OpenXmlWriter.Create(fichier_excel.WorkbookPart);
writer.WriteStartElement(new Workbook());
writer.WriteStartElement(new Sheets());

writer.WriteElement(new Sheet()
{
    Name = "Inventaire",
    SheetId = 1,
    Id = fichier_excel.WorkbookPart.GetIdOfPart(wsp)
});

writer.WriteEndElement();

writer.WriteEndElement();
writer.Close();
writer.Dispose();

fichier_excel.Close();
fichier_excel.Dispose();

Answer 1

For use number type set DataType property of Cell object.

 Cell cell = new Cell();
 cell.DataType = CellValues.Number; 
 cell.CellValue = new CellValue("100");

Also you need comment next row:

 oxa.Add(new OpenXmlAttribute("t", null, "str"));

Also i take newCell.StyleIndex = numberIndexStyle;

For correct display and formatting number you need describe cellformat and numberformat:

  uint iExcelIndex = 164;
  NumberingFormat nformatForcedText = new NumberingFormat
  {
       NumberFormatId = UInt32Value.FromUInt32(iExcelIndex++),
       FormatCode = StringValue.FromString("0.00E+00 ")
  };
  CellFormat cellFormat1 = new CellFormat()
  {
       NumberFormatId = 165U,
       ApplyNumberFormat = true
  };
  NumberingFormats numberingFormats = new NumberingFormats();
  numberingFormats.Append(nformatForcedText);
  numberingFormats.Count = UInt32Value.FromUInt32( (uint)numberingFormats.ChildElements.Count);
 CellFormats cellFormats1 = new CellFormats() {};     
 cellFormats1.Append(cellFormat1 );
 cellFormats1.Count = UInt32Value.ToUInt32((uint) cellFormats1.ChildElements.Count);
 Stylesheet StyleSheet = new Stylesheet();
 StyleSheet.Append(cellFormats1);
 StyleSheet.Append(numberingFormats);

WorkbookStylesPart stylesPart = workbookPart.AddNewPart<WorkbookStylesPart>();
stylesPart.Stylesheet = StyleSheet;
stylesPart.Stylesheet.Save();