Question

I’m trying to turn on AutoFilter for the users who will consume the data.

open Microsoft.Office.Interop.Excel

let xl = ApplicationClass()
xl.Workbooks.OpenText(fileName...)
let wb = xl.Workbooks.Item(1)
let ws = wb.ActiveSheet :?> Worksheet

let rows = string ws.UsedRange.Rows.Count

// AutoFilter method of Range class failed.
ws.Range("A7:I" + rows).AutoFilter() |> ignore

Thanks for any help you can offer.

Answer 1

According to the documentation, you need to pass 5 parameters to AutoFilter.

Unspecified parameters can be filled by System.Reflection.Missing.Value.

Something like

ws.Range("A7:I" + rows).AutoFilter(1, System.Reflection.Missing.Value, 
                                   Excel.XlAutoFilterOperator.xlAnd, 
                                   System.Reflection.Missing.Value, true) 
|> ignore

should work.