StyleFormatConditionBase.Expression Property

Gets or sets the Boolean expression. When it evaluates to true, the StyleFormatConditionBase.Appearance is applied to data. The Expression property is in effect when the StyleFormatConditionBase.Condition property is set to FormatConditionEnum.Expression.

Namespace: DevExpress.XtraEditors

Assembly: DevExpress.XtraEditors.v24.1.dll

NuGet Package: DevExpress.Win.Navigation

Declaration

C#

[DefaultValue("")]
[XtraSerializableProperty]
public string Expression { get; set; }

VB.NET

<DefaultValue("")>
<XtraSerializableProperty>
Public Property Expression As String

Property Value

Type	Default	Description
String	String.Empty	A string that specifies the Boolean expression.

Example

The following example shows how to create a condition to style grid rows, and specify criteria for the condition using a string expression.

The condition’s criteria is specified by the StyleFormatConditionBase.Expression property. The expression selects rows that do not contain null in the Region field. Rows that match this condition will be painted in light pink.

The following image shows this condition applied to an XtraGrid control.

C#

using DevExpress.XtraGrid;

StyleFormatCondition condition1 = new DevExpress.XtraGrid.StyleFormatCondition();
condition1.Appearance.BackColor = Color.SeaShell;
condition1.Appearance.Options.UseBackColor = true;
condition1.Condition = FormatConditionEnum.Expression;
condition1.Expression = "[Region] != ?";
gridView1.FormatConditions.Add(condition1);

VB.NET

Imports DevExpress.XtraGrid

Dim condition1 As StyleFormatCondition = New DevExpress.XtraGrid.StyleFormatCondition()
condition1.Appearance.BackColor = Color.SeaShell
condition1.Appearance.Options.UseBackColor = True
condition1.Condition = FormatConditionEnum.Expression
condition1.Expression = "[Region] != ?"
GridView1.FormatConditions.Add(condition1)