ExcelApplication supports all math, string, boolean, time, statistical, database, lookup and reference formulas or functions that are part of Excel. ExcelWriter does not calculate formulas at run-time; all formulas are calculated when the workbook is opened in Excel.
To insert a formula in a cell, use the propertyCell.Formula. Begin the formula string with =, as you would when entering a formula in Microsoft Excel:
The property Cell.Name returns a cell's Excel-style name (e.g., "B5"). This property can be useful if you want to build a formula string using row and column indexes, rather than cell names, for example:
String formula = "=SUM(" + sheet1.Cells[3, 1].Name + ":" + sheet1.Cells[23, 1].Name + ")"; sheet1.Cells[24, 1].Formula = formula;
Here is an example that demonstrates how to use Formulas with ExcelApplication:
//--- Create ExcelApplication, a Workbook, and a Worksheet ExcelApplication xlw = new ExcelApplication(); Workbook wb = xlw.Create(ExcelApplication.FileFormat.Xlsx); Worksheet sheet1 = wb.Worksheets; //--- Write some values into cells for the //--- formulas to compute sheet1.Cells["A1"].Value = 1; sheet1.Cells["A2"].Value = 2; sheet1.Cells["A3"].Value = 3; //--- Write a formula into a cell //--- Formula will be calculated //--- when opened in Excel sheet1.Cells["A4"].Formula = "=SUM(A1:A3)"; //--- Save the workbook xlw.Save(wb, "Generated.xlsx");