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   [Expand]ActiveViewChangingEventArgs Class
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    [Expand]SchedulerControl Methods
   [Expand]SchedulerDateNavigationBar Class
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 End-User Documentation

SchedulerControl.AllowAppointmentDelete Event

Occurs when the SchedulerControl checks whether the appointment can be deleted. The event fires only if the DevExpress.XtraScheduler.SchedulerOptionsCustomization.AllowAppointmentDelete property is set to Custom.

Namespace:DevExpress.XtraScheduler
Assembly:DevExpress.XtraScheduler.v17.2.dll

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type AppointmentOperationEventArgs containing data related to this event.

The following AppointmentOperationEventArgs properties provide information specific to this event.
Property Description
Allow Gets or sets a value indicating whether an end-user is allowed to perform a particular action.
Recurring Gets or sets a value indicating if the appointment is recurring.

Expanded Remarks

The AllowAppointmentDelete event is fired when the SchedulerControl verifies the ability to remove an appointment. Such verification is required to update the command state (DevExpress.Utils.Commands.ICommandUIState) of the commands available for the end-user. Hence the AllowAppointmentDelete event for a particular appointment occurs not only once, but more often than expected.

Handle the AllowAppointmentDelete event to restrict end-users from deleting an appointment. The appointment to delete can be accessed via the DevExpress.XtraScheduler.AppointmentEventArgs.Appointment property. To deny end-users the ability to delete an appointment , set the DevExpress.XtraScheduler.AppointmentOperationEventArgs.Allow property to false.

We advise that you use only simple checks to determine whether an appointment can be deleted. Methods which require user response are not suitable when handling this event.

Note that the AllowAppointmentDelete event enables you to prevent an appointment from being deleted by end-user actions. To protect an appointment from deletion in all situations, handle the DevExpress.XtraScheduler.SchedulerStorageBase.AppointmentDeleting event.

Expanded Example

This example demonstrates how to implement custom rules for editing and deleting appointments. The code below allows an appointment to be edited only by its owner (the end-user who created it). To do this it's necessary to set the DevExpress.XtraScheduler.SchedulerOptionsCustomization.AllowAppointmentEdit and DevExpress.XtraScheduler.SchedulerOptionsCustomization.AllowAppointmentDelete properties to DevExpress.XtraScheduler.UsedAppointmentType.Custom, and handle the AllowAppointmentEdit and AllowAppointmentDelete events to implement custom logic for editing appointments.

Expanded See Also

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