Iterative calculation is performed to repeatedly calculate a function until a specific numeric condition is met. DsExcel allows you to enable and perform iterative calculations by using EnableIterativeCalculation property of IFormulaOptions interface. Additionally, you can also set or retrieve the following:

• Maximum number of iterations by using MaximumIterations property
• Maximum difference between values of iterative formulas by using MaximumChange property

For example, if MaximumIterations is set to 10 and MaximumChange is set to 0.001, DsExcel will stop calculating either after 10 calculations, or when there is a difference of less than 0.001 between the results.

Refer to the following example code to perform iterative calculation in a worksheet by performing 10 iterations.

//create a new workbook
Workbook workbook = new Workbook();

//enable iterative calculation
workbook.Options.Formulas.EnableIterativeCalculation = true;
workbook.Options.Formulas.MaximumIterations = 10;
var worksheet = workbook.Worksheets[0];
worksheet.Range["A1"].Formula = "=B1 + 1";
worksheet.Range["B1"].Formula = "=A1 + 1";

Console.WriteLine("A1:" + worksheet.Range["A1"].Value.ToString());
Console.WriteLine("B1:" + worksheet.Range["B1"].Value.ToString());

workbook.Save("IterativeCalculation.xlsx");