Avoid UDF Recalculation after deleting Rows or Columns

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Jul 31, 2015, 3:24:24 AM7/31/15
to Excel-DNA

I have been using Excel DNA from past couple of months and so far so good.

Yesterday some of the users complained about  entire excel recalculation after insert or deleting cells in worksheet
i have searched many sites and found that there is no workaround.
But is there any way to avoid this. The users are kind of frustrated with this behavior. 

They usually copy data from different workbook and this refreshes entire worksheet. They usually have 100 s of rows entered and all the 100 rows are getting recalculated which the users are not liking.

Any help/suggestions are highly appreciated.


Govert van Drimmelen

Jul 31, 2015, 3:32:33 AM7/31/15
to Excel-DNA, naina...@gmail.com
Hi Nain,

Are your functions volatile?
Your functions will be volatile in one of these cases:
* You've marked it as [ExcelFunction(IsVolatile=true)]
* You've marked it as [ExcelFunction(IsMacroType=true)] and you have at least one argument of type object that is marked [ExcelArgument(AllowReference=true)].

Also, I think RTD formulae (so anything async in Excel-DNA too) also recalculate when inserting or deleting rows or columns.

Volatile functions can be made less volatile, but you have to consider the function and its context.
For RTD-based stuff there's not much we can do.

If you're not in these cases, you'll need to explain your situation in a bit more detail.



Aug 2, 2015, 4:08:47 PM8/2/15
to Excel-DNA, naina...@gmail.com
Hi Govert - Thanks for the reply. 

I use ExcelAsyncUtil.Run method in the UDF. If we can't control the insert/delete rows/columns, can we catch the row delete column delete actions?

If i can trigger a function for row/column delete operations in excel i can avoid calling the UDF when they fire. Is this possible?

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