CalculatedAttribute Class

Applied to business class properties. Specifies an expression used to calculate the target property value in the Data View mode.

Namespace: DevExpress.ExpressApp.DC

Assembly: DevExpress.ExpressApp.v19.2.dll

Declaration

C#

[AttributeUsage(AttributeTargets.Property, Inherited = true)]
public class CalculatedAttribute :
    Attribute

VB.NET

<AttributeUsage(AttributeTargets.Property, Inherited:=True)>
Public Class CalculatedAttribute
    Inherits Attribute

Remarks

Below is an example of using the CalculatedAttribute.

C#

using DevExpress.ExpressApp.DC;
// ...
public class Person {    
    // ...
    public String FirstName { get; set; }
    public String LastName { get; set; }
    [Calculated("FirstName + ' ' + LastName")]
    public String FullName {
        get {
            return FirstName + " " + LastName;
        }
    }
}

VB.NET

Imports DevExpress.ExpressApp.DC
' ...
Public Class Person
    ' ...
    Public Property FirstName() As String
    Public Property LastName() As String
    <Calculated("FirstName + ' ' + LastName")> _
    Public ReadOnly Property FullName() As String
        Get
            Return FirstName & " " & LastName
        End Get
    End Property
End Class

Properties, used in the CalculatedAttribute.Expression should be persistent to be able to run an SQL query at the database level.

Inheritance

Object

Attribute

CalculatedAttribute