Skip to main content

FormattingRule.DataSource Property


Deserializing a report layout from untrusted resources may create security issues. Serializable System.Object properties that contain custom type values are not (de)serialized automatically. Review the following help topic for information on how to (de)serialize custom type values: Reporting — Safe Deserialization.

Gets or sets a data source containing the list of data fields that can be used in constructing a formatting rule’s FormattingRule.Condition.

Namespace: DevExpress.XtraReports.UI

Assembly: DevExpress.XtraReports.v24.1.dll

NuGet Package: DevExpress.Reporting.Core


public override object DataSource { get; set; }

Property Value

Type Description

A Object representing a formatting rule’s data source.


The DataSource and FormattingRule.DataMember properties together specify the list containing data fields used for Boolean expression construction (the FormattingRule.Condition property).

Note that by default, the DataSource and DataMember properties are set to null (Nothing in Visual Basic), which means that a report’s XtraReportBase.DataSource and XtraReportBase.DataMember properties are used to obtain data fields for the expression.

To learn more, see Conditionally Changing a Control’s Appearance.


This example demonstrates how to conditionally change a control’s appearance at runtime. For this, it is necessary to create an instance of the FormattingRule class, specify its FormattingRule.Condition and FormattingRule.Formatting properties and add this object to a report’s sheet of formatting rules (XtraReport.FormattingRuleSheet) and to the collection of formatting rules of a control or a band, to which it should be applied (XRControl.FormattingRules). Note that the same task can be also solved at design time, as described in the Conditionally Changing a Control’s Appearance topic.

using System.Drawing;
using System.Drawing.Printing;
using DevExpress.XtraReports.UI;
// ...

private void XtraReport1_BeforePrint(object sender, CancelEventArgs e) {
    // Create a new rule and add it to a report.
    FormattingRule rule = new FormattingRule();

    // Specify the rule's properties.
    rule.DataSource = this.DataSource;
    rule.DataMember = this.DataMember;
    rule.Condition = "[UnitPrice] >= 30";
    rule.Formatting.BackColor = Color.WhiteSmoke;
    rule.Formatting.ForeColor = Color.IndianRed;
    rule.Formatting.Font = new Font("Arial", 10, FontStyle.Bold);

    // Apply this rule to the detail band.
See Also