Excel "Refresh All" with OpenXML

Well there is quite good workaround for this. Using OpenXML you can turn on "refresh data when opening the file" option in pivot table (right click on pivot table->PivotTable Options->Data tab). This result in auto refresh pivot table when user first opens spreadsheet. The code:

  using (var document = SpreadsheetDocument.Open(newFilePath, true))
        {
            var uriPartDictionary = BuildUriPartDictionary(document);

            PivotTableCacheDefinitionPart pivotTableCacheDefinitionPart1 = (PivotTableCacheDefinitionPart)uriPartDictionary["/xl/pivotCache/pivotCacheDefinition1.xml"]; 
            PivotCacheDefinition pivotCacheDefinition1 = pivotTableCacheDefinitionPart1.PivotCacheDefinition;
            pivotCacheDefinition1.RefreshOnLoad = true;               
        }

you need to determine "path" to yours pivotCacheDefinition - use OpenXML SDK 2.0 Productivity Tool to look for it.

BuildUriPartDictionary is a standard method generated by OpenXML SDK 2.0 Productivity Tool

protected Dictionary<String, OpenXmlPart> BuildUriPartDictionary(SpreadsheetDocument document)
    {
        var uriPartDictionary = new Dictionary<String, OpenXmlPart>();
        var queue = new Queue<OpenXmlPartContainer>();
        queue.Enqueue(document);
        while (queue.Count > 0)
        {
            foreach (var part in queue.Dequeue().Parts.Where(part => !uriPartDictionary.Keys.Contains(part.OpenXmlPart.Uri.ToString())))
            {
                uriPartDictionary.Add(part.OpenXmlPart.Uri.ToString(), part.OpenXmlPart);
                queue.Enqueue(part.OpenXmlPart);
            }
        }
        return uriPartDictionary;
    }

Another solution is to convert your spreadsheet to macroenabled, embed there a VBA script that will refresh all pivot tables. This can happen on button click or again when user opens spreadsheet. Here you can find VBA code to refresh pivot tables: http://www.ozgrid.com/VBA/pivot-table-refresh.htm

I think the only way you can do this is following this type of method..

1. Save Open XML workbook back to a xlsx file.
2. Load the workbook using the Excel object model.
3. Call either

ThisWorkbook.PivotCaches(yourIndex).Refresh();

or

ThisWorkbook.RefreshAll();

although I was pretty sure RefreshAll would also work.

4. Use the object model to Save the workbook and close it.
5. Reopen for use with xml namespaces.

You can't do this with Open XML. Open XML allows you to work with the data stored in the file and change the data and formulas and definitions and such. It doesn't actually do any calculations.

Excel automation technically would work, but it's absolutely not recommended for a server environment and is best avoided on the desktop if at all possible.