OpenXML SDK: Make Excel recalculate formula

Question

I update some cells of an Excel spreadsheet through the Microsoft Office OpenXML SDK 2.0. Changing the values makes all cells containing formula that depend on the changed c

Answer 1

Since it partially solves my problem and there seems to be no better solution so far, moved that codeblock out from the question to an answer... This is how the new code looks like:

foreach (WorksheetPart worksheetPart in spreadSheet.WorkbookPart.WorksheetParts)
{
    foreach (Row row in
            worksheetPart.Worksheet.GetFirstChild<SheetData>().Elements())
    {
        foreach (Cell cell in row.Elements())
        {
            if (cell.CellFormula != null && cell.CellValue != null)
                cell.CellValue.Remove();
        }
    }
}

Answer 2

spreadSheet.WorkbookPart.Workbook.CalculationProperties.ForceFullCalculation = true;
spreadSheet.WorkbookPart.Workbook.CalculationProperties.FullCalculationOnLoad = true;

Works for me!

Answer 3

You need to save the worksheet at the end, This worked for me.

foreach (WorksheetPart worksheetPart in spreadSheet.WorkbookPart.WorksheetParts) {
    foreach (Row row in
            worksheetPart.Worksheet.GetFirstChild<SheetData>().Elements()) {
        foreach (Cell cell in row.Elements()) {
            if (cell.CellFormula != null && cell.CellValue != null)
                cell.CellValue.Remove();
        }
    }
    worksheetPart.Worksheet.Save();
}

Answer 4

I use this

    static void FlushCachedValues(SpreadsheetDocument doc)
    {
        doc.WorkbookPart.WorksheetParts
            .SelectMany(part => part.Worksheet.Elements<SheetData>())
            .SelectMany(data => data.Elements<Row>())
            .SelectMany(row => row.Elements<Cell>())
            .Where(cell => cell.CellFormula != null)
            .Where(cell => cell.CellValue != null)
            .ToList()
            .ForEach(cell => cell.CellValue.Remove())
            ;
    }

This flushes the cached values

greets

Answer 5

Alternatively, you can change the formulas to use INDIRECT operator. Especially useful if you are using SAX + template files approach. Since this solution does not require changing your code, only template excel files. Please refer to my solution here - Set xlsx to recalculate formulae on open