ASPxGridListEditor.CreateCustomDataItemTemplate Event

Occurs when the GridViewDataColumn.DataItemTemplate is initialized.

Namespace: DevExpress.ExpressApp.Web.Editors.ASPx

Assembly: DevExpress.ExpressApp.Web.v18.2.dll

Declaration

C#

public event EventHandler<CreateCustomDataItemTemplateEventArgs> CreateCustomDataItemTemplate

VB.NET

Public Event CreateCustomDataItemTemplate As EventHandler(Of CreateCustomDataItemTemplateEventArgs)

Event Data

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

Property	Description
CreateDefaultDataItemTemplate	Specifies if the default data item template should be created.
DataItemTemplateInfoProvider	Gets the object that provides info on the GridViewDataColumn.DataItemTemplate. Inherited from CreateCustomItemTemplateEventArgs.
Handled	Gets or sets a value that indicates whether the event handler has completely handled the event or whether the system should continue its own processing. Inherited from HandledEventArgs.
ModelColumn	Gets the Application Model settings of the column. Inherited from CreateCustomItemTemplateEventArgs.
Template	Specifies a template that is used to display a data cell or edit cell. Inherited from CreateCustomItemTemplateEventArgs.

Remarks

This event is triggered when the GridViewDataColumn.DataItemTemplate is null (Nothing in VB) and the column does not display “Protected Content”. To specify a custom ITemplate, handle this event, pass the custom ITemplate object to the handler’s CreateCustomItemTemplateEventArgs.Template parameter and set the Handled parameter to true. If you set Handled to true and do not initialize Template, the default column behavior will be used (the Object.ToString values will be displayed).

C#

using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Web.Editors.ASPx;
// ...
public class CreateCustomDataItemTemplateController : ObjectViewController<ListView, Person> {
    protected override void OnActivated() {
        base.OnActivated();
        ASPxGridListEditor listEditor = (ASPxGridListEditor)View.Editor;
        listEditor.CreateCustomDataItemTemplate += listEditor_CreateCustomDataItemTemplate;
    }
    private void listEditor_CreateCustomDataItemTemplate(
        object sender, CreateCustomDataItemTemplateEventArgs e) {
        // ...
        e.Handled = true;
    }
    protected override void OnDeactivated() {
        base.OnDeactivated();
        ASPxGridListEditor listEditor = (ASPxGridListEditor)View.Editor;
        listEditor.CreateCustomDataItemTemplate -= listEditor_CreateCustomDataItemTemplate;
    }
}

VB.NET

Imports DevExpress.ExpressApp
Imports DevExpress.ExpressApp.Web.Editors.ASPx
' ...
Public Class CreateCustomDataItemTemplateController
    Inherits ObjectViewController(Of ListView, Person)
    Protected Overrides Sub OnActivated()
        MyBase.OnActivated()
        Dim listEditor As ASPxGridListEditor = CType(View.Editor, ASPxGridListEditor)
        AddHandler listEditor.CreateCustomDataItemTemplate, _
        AddressOf listEditor_CreateCustomDataItemTemplate
    End Sub
    Private Sub listEditor_CreateCustomDataItemTemplate(ByVal sender As Object, ByVal e As CreateCustomDataItemTemplateEventArgs)
        ' ...
       e.Handled = True
    End Sub
    Protected Overrides Sub OnDeactivated()
        MyBase.OnDeactivated()
        Dim listEditor As ASPxGridListEditor = CType(View.Editor, ASPxGridListEditor)
        RemoveHandler listEditor.CreateCustomDataItemTemplate, AddressOf listEditor_CreateCustomDataItemTemplate
    End Sub
End Class

Important

You should subscribe to this event before the View.ControlsCreated event occurs (e.g., in the overridden OnActivated method of a custom Controller). It is too late to customize columns when the grid control has already been created.