CalculatedField.DataMember Property

Specifies the data member of the calculated field.

Namespace: DevExpress.XtraReports.UI

Assembly: DevExpress.XtraReports.v21.2.dll

NuGet Package: DevExpress.Reporting.Core

Declaration

C#

public override string DataMember { get; set; }

VB.NET

Public Overrides Property DataMember As String

Property Value

Type	Description
String	A String containing a calculated field’s data member.

Remarks

To allow a calculated field to get access to data fields available in a data source, specify the CalculatedField.DataSource and DataMember properties. Following that, you can refer to these data fields from within the calculated field’s CalculatedField.Expression.

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.

C#

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();
}

VB.NET

Imports System
Imports System.Windows.Forms
Imports DevExpress.XtraReports.UI
Imports DevExpress.XtraReports.Configuration
' ...

Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click

    ' Create a report.
    Dim report As New XtraReport1()

    ' Create a calculated field, 
    ' and add it to the report's collection.
    Dim calcField As 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 = "A Calculated Field"
    calcField.Name = "myField"
    calcField.Expression = "[UnitPrice] * [Quantity]"

    ' 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.
    Dim pt As New ReportPrintTool(report)
    pt.ShowPreviewDialog()
End Sub