AppearanceAttribute.Enabled Property

Specifies whether to enable UI elements affected by the conditional appearance rule generated from this attribute instance.

Namespace: DevExpress.ExpressApp.ConditionalAppearance

Assembly: DevExpress.Persistent.Base.v25.2.dll

NuGet Package: DevExpress.Persistent.Base

Declaration

C#

public bool Enabled { get; set; }

VB.NET

Public Property Enabled As Boolean

Property Value

Type	Description
Boolean	true, if UI elements affected by the conditional appearance rule must be enabled; otherwise, false.

Remarks

The following UI elements can be made disabled/enabled:

• Data cells in a GridListEditor and ASPxGridListEditor when switching to the inline editing mode
• Property Editors that are inherited from the PropertyEditor class.
• Actions

You can find many examples in the Declare Conditional Appearance Rules in Code topic.

Tip

You can find examples of this functionality in the MainDemo demo included with XAF. The demo illustrates various XAF features (including Appearance attribute) and is located in the %PUBLIC%\Documents\DevExpress Demos 25.2\Components\XAF\MainDemo.NET.EFCore folder.

The example below demonstrates how to disable the NickName property editor in the Contact Detail View.

C# (EF Core)

using System;
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Actions;
using DevExpress.Persistent.Base;
// ...
public class Contact : BaseObject {
    // ...
    [Appearance("NickNameDisabled", Context = "Contact_DetailView", AppearanceItemType = "ViewItem", Enabled = false)]
    public virtual string NickName { get; set; }
}

// Make sure that you use options.UseChangeTrackingProxies() in your DbContext settings.

C# (XPO)

using System;
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Actions;
using DevExpress.Persistent.Base;
using DevExpress.Persistent.BaseImpl;
// ...
public class Contact : BaseObject {
// ...
    [Appearance("NickNameDisabled", Context = "Contact_DetailView", AppearanceItemType = "ViewItem", Enabled = false)]
    public string NickName {
        get {
            return nickName;
        }
        set {
            SetPropertyValue(nameof(NickName), ref nickName, value);
        }
    }
}

VB.NET (XPO)

Imports System
Imports DevExpress.ExpressApp
Imports DevExpress.ExpressApp.Actions
Imports DevExpress.Persistent.Base
Imports DevExpress.Persistent.BaseImpl
' ...
Public Class Contact
    Inherits BaseObject
' ...
    <Appearance("NickNameDisabled", Context := "Contact_DetailView", AppearanceItemType := "ViewItem", _
    Enabled := False)>
    Public Property NickName() As String
        Get
            Return nickName
        End Get
        Set(ByVal value As String)
            SetPropertyValue(NameOf(NickName), nickName, value)
        End Set
    End Property