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SchedulerControl.AppointmentAdding Event

Occurs before the user has added appointments to the scheduler.

Namespace: DevExpress.Xpf.Scheduling

Assembly: DevExpress.Xpf.Scheduling.v20.1.dll

Declaration

public event AppointmentAddingEventHandler AppointmentAdding
Public Event AppointmentAdding As AppointmentAddingEventHandler

Event Data

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

Property Description
Appointments Provides access to the collection of appointments the user attempts to add to the scheduler.
Cancel Gets or sets whether the event should be canceled. Inherited from CancelRoutedEventArgs.
CanceledAppointments Provides access to the collection of appointments that should be excluded from being added to the scheduler.
ConflictedAppointments Returns the collection of appointments that are conflicting with the current appointments.
Handled Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. Inherited from RoutedEventArgs.
OriginalSource Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs.
RoutedEvent Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs.
Source Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.

Remarks

To prevent specific appointments from being added to the scheduler, add them to the CanceledAppointments collection.

The code snippet below demonstrates how to implement custom validation:

 AppointmentAdding += (d, e) => { 
    foreach(var apt in e.Appointments) { //each appointment which is about to be added
        bool res = Validate(apt); //is validated by a custom method 
        if(!res) //if the validation fails 
            e.CanceledEditAppointments.Add(apt); //this appointment is not added to the scheduler
    } 
}
See Also