XlExpression Class

An object which can be used to specify a worksheet cell formula.

Namespace: DevExpress.Export.Xl

Assembly: DevExpress.Printing.v18.2.Core.dll

Declaration

C#

public class XlExpression :
    List<XlPtgBase>

VB.NET

Public Class XlExpression
    Inherits List(Of XlPtgBase)

Related API Members

The following members return XlExpression objects:

• XlCondFmtRuleExpression.Expression

Remarks

The XlExpression is a List<T><DevExpress.Export.Xl.XlPtgBase,> list of formula tokens (aka PTGs, “parsed things”) arranged in Reverse-Polish Notation order.

To create an expression, add required tokens in the proper order to the XlExpression instance.

Use the XlExpression instance to specify a worksheet cell formula with the IXlCell.SetFormula or IXlCell.SetSharedFormula methods.

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<T><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.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/xl-export-api-examples-t253492

FormulaActions.cs

// 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);
    }
}

FormulaActions.vb

' Create a formula using XlExpression.
Using row As IXlRow = sheet.CreateRow()
    row.SkipCells(2)
    Using cell As IXlCell = row.CreateCell()
        cell.Value = "Mean value:"
        cell.ApplyFormatting(totalRowFormatting)
    End Using
    Using cell As IXlCell = row.CreateCell()
        ' Set the formula to calculate the mean value.
        ' =$D$6/4
        Dim expression As 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)
    End Using
End Using

Inheritance

Object

List<DevExpress.Export.Xl.XlPtgBase>

XlExpression