PersistenceValidationController.CustomGetAggregatedObjectsToValidate Event

Occurs when determining which aggregated objects should be validated.

Namespace: DevExpress.ExpressApp.Validation

Assembly: DevExpress.ExpressApp.Validation.v18.2.dll

Declaration

C#

public event EventHandler<CustomGetAggregatedObjectsToValidateEventArgs> CustomGetAggregatedObjectsToValidate

VB.NET

Public Event CustomGetAggregatedObjectsToValidate As EventHandler(Of CustomGetAggregatedObjectsToValidateEventArgs)

Event Data

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

Property	Description
AggregatedObjects	Specifies the CustomGetAggregatedObjectsToValidateEventArgs.OwnerObject‘s aggregated objects to be validated.
Handled	Gets or sets a value that indicates whether the event handler has completely handled the event or whether the system should continue its own processing. Inherited from HandledEventArgs.
OwnerObject	Specifies the object whose aggregated objects are about to be validated.

Remarks

Handle this event to manually specify the OwnerObject‘s aggregated objects to be validated. By default, all aggregated objects are validated. To create the list of objects to be validated manually, add these objects to the AggregatedObjects list and set the Handled parameter to true.

Validation may take significant time when an object to be saved exposes a large collection of aggregated objects. By default, aggregated objects are considered to be an integral part of a master object, and thus, they should be validated together with the master object. The entire collection will be loaded in this instance. However, you can use the CustomGetAggregatedObjectsToValidate event to change this behavior and cancel validating the aggregated objects that are not updated. You can use the IObjectSpace.IsObjectToSave method to ensure that a certain object is not modified.

C#

void CustomGetAggregatedObjectsToValidate(object sender, CustomGetAggregatedObjectsToValidateEventArgs e) {
    if (e.OwnerObject is Contact) {
        foreach (PhoneNumber number in ((Contact)e.OwnerObject).PhoneNumbers) {
            if (ObjectSpace.IsObjectToSave(number)) {
                e.AggregatedObjects.Add(number);
            }
        }
    }
    e.Handled = true;
}

VB.NET

Private Sub CustomGetAggregatedObjectsToValidate(ByVal sender As Object, ByVal e As CustomGetAggregatedObjectsToValidateEventArgs)
    If TypeOf e.OwnerObject Is Contact Then
        For Each number As PhoneNumber In CType(e.OwnerObject, Contact).PhoneNumbers
            If ObjectSpace.IsObjectToSave(number) Then
                e.AggregatedObjects.Add(number)
            End If
        Next number
    End If
    e.Handled = True
End Sub

Important

The drawback of this approach is that invalid aggregated objects that were added before the rule is introduced, or created in the database directly, will be skipped.

See the another example of using the CustomGetAggregatedObjectsToValidate event in the PersistenceValidationController class description.