windowsforms-devexpress-dot-xtrascheduler-dot-schedulerdatastorage-af57970a.md
Allows you to cancel the insertion of an appointment.
Namespace : DevExpress.XtraScheduler
Assembly : DevExpress.XtraScheduler.v25.2.dll
NuGet Package : DevExpress.Win.Scheduler
public event PersistentObjectCancelEventHandler AppointmentInserting
Public Event AppointmentInserting As PersistentObjectCancelEventHandler
The AppointmentInserting event's data class is PersistentObjectCancelEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| Cancel | Gets or sets whether to cancel the operation. |
| Object | Gets the persistent object (appointment, resource or appointment dependency) for which the event occurs. Inherited from PersistentObjectEventArgs. |
The AppointmentInserting event is raised before an appointment is added to the AppointmentBaseCollection collection and allows you to cancel the operation. The event parameter’s PersistentObjectEventArgs.Object property allows the processed appointment to be identified. To prevent it from being added, set the PersistentObjectCancelEventArgs.Cancel property to true.
Note
Do not modify the appointment’s data source or data binding within this event handler. It results in the current appointment being disposed of, and consequently, an unhandled exception occurs.
Tip
The SchedulerDataStorage.AppointmentsInserted event is raised after the SchedulerDataStorage.AppointmentInserting event, when appointments are already in the storage and are saved to the external data source (if any). At the moment, you cannot prevent them from being saved.
To validate appointment insertion, you can get properties of the appointment being inserted by casting the e.Object parameter to the Appointment type. The following example adds a timestamp to the created appointment:
private void SchedulerStorage1_AppointmentInserting(object sender, PersistentObjectCancelEventArgs e) {
if (((Appointment)e.Object).Start < DateTime.Now) e.Cancel = true;
}
Private Sub SchedulerStorage1_AppointmentInserting(ByVal sender As Object, ByVal e As PersistentObjectCancelEventArgs)
If CType(e.Object, Appointment).Start < Date.Now Then
e.Cancel = True
End If
End Sub
Tip
You can use the SchedulerControl.InitNewAppointment event for appointment initialization.
The following code snippet (auto-collected from DevExpress Examples) contains a reference to the AppointmentInserting event.
Note
The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.
schedulerDataStorage1.AppointmentInserting += SchedulerStorage1_AppointmentInserting;
schedulerDataStorage1.AppointmentsInserted += new PersistentObjectsEventHandler(this.OnApptChangedInsertedDeleted);
AddHandler schedulerDataStorage1.AppointmentInserting, AddressOf SchedulerStorage1_AppointmentInserting
AddHandler schedulerDataStorage1.AppointmentsInserted, AddressOf OnApptChangedInsertedDeleted
See Also