XafApplication.DetailViewCreating Event

Occurs when creating a Detail View.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v23.2.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

public event EventHandler<DetailViewCreatingEventArgs> DetailViewCreating

VB.NET

Public Event DetailViewCreating As EventHandler(Of DetailViewCreatingEventArgs)

Event Data

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

Property	Description
EnableDelayedObjectLoading	For internal use. Use the DetailView.UseAsyncLoading field instead of this property.
IsRoot	Indicates whether a root View must be created. Inherited from ViewCreatingEventArgs.
Obj	Returns the object that represents a current object for the Detail View to be the created.
ObjectSpace	Returns the Object Space to be used when creating a new View. Inherited from ViewCreatingEventArgs.
View	Specifies the Detail View which is created in the XafApplication.DetailViewCreating event.
ViewID	Returns the ID of the created View. Inherited from ViewCreatingEventArgs.

Remarks

Handle this event to provide a custom Detail View instead of a default one. Use the handler’s ViewCreatingEventArgs.ViewID parameter to get information on the created Detail View. To do this use the application’s XafApplication.FindModelView method passing the View ID as a parameter. To specify the Detail View’s current object use the handler’s DetailViewCreatingEventArgs.Obj parameter. Create the Detail View in the Object Space passed as the handler’s ViewCreatingEventArgs.ObjectSpace parameter.

The following example demonstrates how to handle the DetailViewCreating event to select a DetailView model based on properties of a displayed object:

C#

using DevExpress.ExpressApp;
// using MainDemo.Module.BusinessObjects;

public class EmployeeDetailViewModelController : WindowController {
    public EmployeeDetailViewModelController() {
        TargetWindowType = WindowType.Main;
    }
    protected override void OnActivated() {
        base.OnActivated();
        Application.DetailViewCreating += Application_DetailViewCreating;
    }
    private void Application_DetailViewCreating(object sender, DetailViewCreatingEventArgs e) {
        if (e.ViewID == "Employee_DetailView" && e.Obj is Employee employee && employee.Position?.Title == "Manager") {
            e.ViewID = "Employee_DetailView_Manager";
        }
    }
    protected override void OnDeactivated() {
        base.OnDeactivated();
        Application.DetailViewCreating -= Application_DetailViewCreating;
    }
}

VB.NET

Imports DevExpress.ExpressApp
'Imports MainDemo.Module.BusinessObjects

Public Class EmployeeDetailViewModelController
    Inherits WindowController
    Public Sub New()
        TargetWindowType = WindowType.Main
    End Sub
    Protected Overrides Sub OnActivated()
        MyBase.OnActivated()
        AddHandler Application.DetailViewCreating, AddressOf Application_DetailViewCreating
    End Sub
    Private Sub Application_DetailViewCreating(ByVal sender As Object, ByVal e As DetailViewCreatingEventArgs)
        If e.ViewID = "Employee_DetailView" AndAlso TypeOf e.Obj Is Employee AndAlso CType(e.Obj, Employee).Position?.Title = "Manager" Then
            e.ViewID = "Employee_DetailView_Manager"
        End If
    End Sub
    Protected Overrides Sub OnDeactivated()
        MyBase.OnDeactivated()
        RemoveHandler Application.DetailViewCreating, AddressOf Application_DetailViewCreating
    End Sub
End Class

Note

If DetailView.UseAsyncLoading is set to true, note the following:

• when you open a Detail View from the Navigation, the DetailViewCreatingEventArgs.Obj argument of the DetailViewCreating event is set to null;
• when you open a Detail View from a List View (by double-clicking a record or using the OpenObject Action), the DetailViewCreatingEventArgs.Obj argument of the DetailViewCreating event is set to the object from the List View’s Object Space.