How to: Customize Vertical Appointment Template (ASP.NET Core Blazor)

• Jul 09, 2025
• 2 minutes to read

This article explains how to implement a custom VerticalAppointmentTemplate in your ASP.NET Core Blazor application.

Note

For the purposes of this article, you can use the MainDemo application installed as a part of the XAF package. The default location of the application is %PUBLIC%\Documents\DevExpress Demos 25.1\Components\XAF.

The default VerticalAppointmentTemplate has the following look:

1. In the Solution Explorer, navigate to the MainDemo.Blazor.Server project, create a new folder, and name it MyComponents.

2. In the MyComponents folder, create a new Razor component and name it DayViewTemplate.razor. Replace the auto-generated content with the following code:

   @using DevExpress.Blazor
   @namespace MyComponents
   <div class="card shadow-sm bg-white p-2" style="overflow: hidden; height: 100%;box-shadow: .125rem .25rem rgba(34,34,34,0.15)">
       <span class="text-dark ps-0 mb-1" style="font-weight:600; font-size: .925em;">@Context.Appointment.Subject</span>
   </div>
   
   @code {
       [Parameter]
       public DxSchedulerAppointmentView Context { get; set; } = default!;
       public static RenderFragment Create(DxSchedulerAppointmentView appointmentView) =>
           @<DayViewTemplate Context=@appointmentView />;
   }
   

3. Navigate to the properties of the DayViewTemplate.razor file and set the Build Action property to Content.

   

4. In the MainDemo.Blazor.Server\Controllers folder, create a View Controller and name it SchedulerTemplateCustomizationController.cs. Replace the auto-generated content with the following code:

   using DevExpress.ExpressApp;
   using DevExpress.ExpressApp.Scheduler.Blazor.Controllers;
   using DevExpress.ExpressApp.Scheduler.Blazor.Editors;
   using DevExpress.Persistent.Base.General;
   using Microsoft.AspNetCore.Components;
   using MyComponents;
   
   namespace MainDemo.Blazor.Server.Controllers {
       public class SchedulerTemplateCustomizationController : ObjectViewController<ListView, IEvent> {
           protected override void OnActivated() {
               base.OnActivated();
               //  Deactivate SchedulerAppointmentTemplatesController because it assigns the VerticalAppointmentTemplate property and can override your customization.
               Frame.GetController<SchedulerAppointmentTemplatesController>().Active["ByDesign"] = false;
           }
           protected override void OnViewControlsCreated() {
               base.OnViewControlsCreated();
               if(View.Editor is SchedulerListEditor schedulerListEditor) {
                   schedulerListEditor.DayViewModel.VerticalAppointmentTemplate = appointmentView => DayViewTemplate.Create(appointmentView);
               }
           }
           protected override void OnDeactivated() {
               Frame.GetController<SchedulerAppointmentTemplatesController>().Active.RemoveItem("ByDesign");
               base.OnDeactivated();
           }
       }
   }
   

5. Build the project and run the application. Navigate to the Calendar List View. The customized VerticalAppointmentTemplate should look like this:

   

Tip

• This example demonstrates the customized Day View, but the same technique is applicable to other View types as well.
• You can use this technique to customize HorizontalAppointmentTemplate.