SchedulerControl.AppointmentRemoving Event

Occurs when the user removes an appointment.

Namespace: DevExpress.UI.Xaml.Scheduler

Assembly: DevExpress.UI.Xaml.Scheduler.v21.2.dll

NuGet Package: DevExpress.Uwp.Controls

Declaration

C#

public event EventHandler<AppointmentRemovingEventArgs> AppointmentRemoving

VB.NET

Public Event AppointmentRemoving As EventHandler(Of AppointmentRemovingEventArgs)

Event Data

The AppointmentRemoving event's data class is DevExpress.UI.Xaml.Scheduler.AppointmentRemovingEventArgs.

Remarks

The AppointmentRemoving is a deferred event. You can process the event in a synchronous mode pausing the SchedulerControl. For example, it can be useful if you want to prompt the user to save changes.

To pause the SchedulerControl, use the event’s GetDeferral method. It returns an EventDeferral object. To resume the SchedulerControl’s processing, call the EventDeferral.Complete method.

Important

If you don’t call the EventDeferral.Complete method after calling the GetDeferral method, the SchedulerControl’s processing never resumes.

The example below illustrates how to use the EventDeferral to prompt the user to save changes.

C#

 private async void  Scheduler_AppointmentRemoving(object sender, DevExpress.UI.Xaml.Scheduler.AppointmentRemovingEventArgs e) {
    var deferral = e.GetDeferral();
    var dialog = new MessageDialog("Do you want to remove the Appointment?", "Confirmation");
    dialog.Commands.Add(new Windows.UI.Popups.UICommand { Label = "Yes", Id = 0 });
    dialog.Commands.Add(new Windows.UI.Popups.UICommand { Label = "No", Id = 1 });
    var res = await dialog.ShowAsync();

    e.Cancel = (int)res.Id == 1;
    deferral.Complete();
}

VB.NET

 Private Async Sub Scheduler_AppointmentRemoving(ByVal sender As Object, ByVal e As DevExpress.UI.Xaml.Scheduler.AppointmentRemovingEventArgs)
    Dim deferral = e.GetDeferral()
    Dim dialog = New MessageDialog("Do you want to remove the Appointment?", "Confirmation")
    dialog.Commands.Add(New Windows.UI.Popups.UICommand With {
        .Label = "Yes",
        .Id = 0
    })
    dialog.Commands.Add(New Windows.UI.Popups.UICommand With {
        .Label = "No",
        .Id = 1
    })
    Dim res = Await dialog.ShowAsync()

    e.Cancel = CInt(Math.Truncate(res.Id)) = 1
    deferral.Complete()
End Sub