Create a Calculated Field (Runtime Sample)

This example demonstrates how a calculated field can be created at runtime and bound to a control's XRControl.Text property.

using System;
using System.Windows.Forms;
using DevExpress.XtraReports.UI;
using DevExpress.XtraReports.Configuration;
// ...

private void button1_Click(object sender, EventArgs e) {

    // Create a report.
    XtraReport1 report = new XtraReport1();

    // Create a calculated field 
    // and add it to the report's collection.
    CalculatedField calcField = new CalculatedField();

    // Define the calculated field's properties.
    calcField.DataSource = report.DataSource;
    calcField.DataMember = report.DataMember;
    calcField.FieldType = FieldType.Double;
    calcField.DisplayName = "Calculated Field";
    calcField.Name = "myField";
    calcField.Expression = "[UnitPrice] * [UnitsInStock]";

    // Bind a label's Text property to the calculated field.
    report.FindControl("xrlabel2", true).DataBindings.Add("Text", null, "Order Details.myField");

    // Bind a label's Text property to the calculated field 
    // depending on the report's data binding mode.
    if (Settings.Default.UserDesignerOptions.DataBindingMode == DataBindingMode.Bindings)
        report.FindControl("xrlabel3", true).DataBindings.Add("Text", null, "Products.myField", "{0:c2}");
    else report.FindControl("xrlabel3", true).ExpressionBindings.Add(
        new ExpressionBinding("BeforePrint", "Text", "FormatString('{0:c2}', [myField])"));

    // Display the report.
    ReportPrintTool printTool = new ReportPrintTool(report);

The result is shown in the following image.