WebApplication.ControlsCreating Event

Occurs before creating controls for the Web Forms page.

Namespace: DevExpress.ExpressApp.Web

Assembly: DevExpress.ExpressApp.Web.v23.2.dll

NuGet Package: DevExpress.ExpressApp.Web

Declaration

C#

public event EventHandler<ControlsCreatingEventArgs> ControlsCreating

VB.NET

Public Event ControlsCreating As EventHandler(Of ControlsCreatingEventArgs)

Event Data

The ControlsCreating event's data class is ControlsCreatingEventArgs. The following properties provide information specific to this event:

Property	Description
Page	Gets the Web Forms page.

Remarks

The ControlsCreating event is raised as the result of executing the WebApplication.CreateControls method. Handle this event to access a Page object, before its controls are created. This object is accessible via the ControlsCreatingEventArgs.Page parameter.

C#

using DevExpress.ExpressApp.Web;
// ...
public class MyController : Controller {
    protected override void OnActivated() {
        base.OnActivated();
        ((WebApplication)Application).ControlsCreating += Instance_ControlsCreating;
    }
    private void Instance_ControlsCreating(object sender, ControlsCreatingEventArgs e) {
        // Access the Page object via the e.Page parameter:
        e.Page.PreRender += Page_PreRender;
        // ...
    }
    // ...
    protected override void OnDeactivated() {
        WebApplication webApplication = ((WebApplication)Application);
        if(webApplication != null) {
            webApplication.ControlsCreating -= Instance_ControlsCreating;
        }
        base.OnDeactivated();
    }
}

VB.NET

Imports DevExpress.ExpressApp.Web
' ...
Public Class MyController
    Inherits Controller
    Protected Overrides Sub OnActivated()
        MyBase.OnActivated()
        AddHandler (CType(Application, WebApplication)).ControlsCreating, _
        AddressOf Instance_ControlsCreating
    End Sub
    Private Sub Instance_ControlsCreating( _
    ByVal sender As Object, ByVal e As ControlsCreatingEventArgs)
        ' Access e.Page here:
        e.Page.PreRender += Page_PreRender
        ' ...
    End Sub
    ' ...
    Protected Overrides Sub OnDeactivated()
        Dim webApplication As WebApplication = (CType(Application, WebApplication))
        If webApplication IsNot Nothing Then
            RemoveHandler webApplication.ControlsCreating, AddressOf Instance_ControlsCreating
        End If
        MyBase.OnDeactivated()
    End Sub
End Class