CalculatedField.DataSource Property
Specifies the data source, associated with the calculated field.
Namespace: DevExpress.XtraReports.UI
Assembly: DevExpress.XtraReports.v21.2.dll
NuGet Package: DevExpress.Reporting.Core
Declaration
Property Value
Type | Description |
---|---|
Object | A Object representing a calculated field’s data source. |
Remarks
To allow a calculated field to get access to data fields available in a data source, specify the DataSource and CalculatedField.DataMember properties. Following that, you can refer to these data fields from within the calculated field’s CalculatedField.Expression.
When a calculated field’s DataSource is empty, the field tries to obtain it from its parent (i.e., the XtraReport object to which the calculated field belongs).
To learn more, see Calculated Fields Overview.
Example
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();
report.CalculatedFields.Add(calcField);
// 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("xrlabel1", true).ExpressionBindings.Add(new ExpressionBinding("BeforePrint", "Text", "FormatString('{0:c2}', [myField])"));
// Display the report.
ReportPrintTool printTool = new ReportPrintTool(report);
printTool.ShowPreviewDialog();
}