IXlCell.SetFormula(XlExpression) Method

Assigns the specified formula expression to a cell.

Namespace: DevExpress.Export.Xl

Assembly: DevExpress.Printing.v21.2.Core.dll

Declaration

void SetFormula(
    XlExpression formula
)

Parameters

Name Type Description
formula XlExpression

A XlExpression object that is a collection of syntactic tokens (PTGs, an acronym of “parsed thing”).

Remarks

Use this SetFormula method override instead of the method which uses a formula string as a parameter if the formula parser cannot be specified when calling the XlExport.CreateExporter method to start export.

The XlFormulaParser class used as a formula parser requires a reference to the DevExpress.Spreadsheet.v21.2.Core.dll assembly, so if this assembly is missing, a string formula cannot be parsed. Missing parser does not allow export to the .xls (Excel 97-2003) format and leaves unvalidated formulas in a worksheet exported to the .xlsx (OpenXml) format.

Example

This code snippet show how to create an expression “from scratch” by adding formula tokens (aka PTGs, “parsed things”) to the XlExpression instance which is a List<DevExpress.Export.Xl.XlPtgBase> list of tokens arranged in Reverse-Polish Notation order. Subsequently, the expression is passed to the IXlCell.SetFormula method to specify a cell formula.

// Create a formula using XlExpression.
using (IXlRow row = sheet.CreateRow()) {
    row.SkipCells(2);
    using (IXlCell cell = row.CreateCell()) {
        cell.Value = "Mean value:";
        cell.ApplyFormatting(totalRowFormatting);
    }
    using (IXlCell cell = row.CreateCell()) {
        // Set the formula to calculate the mean value.
        // =$D$6/4
        XlExpression expression = new XlExpression();
        expression.Add(new XlPtgRef(new XlCellPosition(cell.ColumnIndex, row.RowIndex - 1, XlPositionType.Absolute, XlPositionType.Absolute)));
        expression.Add(new XlPtgInt(row.RowIndex - 2));
        expression.Add(new XlPtgBinaryOperator(XlPtgTypeCode.Div));
        cell.SetFormula(expression);
        cell.ApplyFormatting(totalRowFormatting);
    }
}
See Also