In fact if the cells dataset is large, we are
afraid it will not give much better performance by providing you an enumerator
for the special cell type than enumerating and check those cells by yourself.
If you just want to make the formulas hidden, we think the best way is that you set the
default style of the workbook to hide all the formulas and protect worksheets in it. The sample code should be like the following:
Workbook wb = new Workbook();
Style style = wb.DefaultStyle;
style.IsLocked = false;
style.IsFormulaHidden = true;
wb.DefaultStyle = style;
Hope, this helps.