RuleSet.CustomIsEmptyValue Event

Occurs when the RuleSet.IsEmptyValue method is executed to determine whether or not the property value is considered empty.

Namespace : DevExpress.Persistent.Validation

Assembly : DevExpress.Persistent.Base.v25.2.dll

NuGet Package : DevExpress.Persistent.Base

Declaration

csharp

public static event EventHandler<CustomIsEmptyValueEventArgs> CustomIsEmptyValue

Public Shared Event CustomIsEmptyValue As EventHandler(Of CustomIsEmptyValueEventArgs)

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

Property	Description
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.
IsEmpty	Specifies whether or not the validation rule’s target property value is considered to be empty.
PropertyName	Gets the name of the validation rule’s target property.
PropertyValue	Gets the validation rule’s target property value.
ServiceProvider	Gets the IServiceProvider used to access the application’s services.
TargetObject	Gets the validation rule’s target object.

Note that the event occurs at the validation process of each rule to determine whether a property value should be considered empty.

Handle this event to determine when the RuleRequiredFieldAttribute validation rule considers that its target property has a value. Access the handler’s CustomIsEmptyValueEventArgs.TargetObject, CustomIsEmptyValueEventArgs.PropertyName and CustomIsEmptyValueEventArgs.PropertyValue parameters to implement the custom validation logic. Pass the validation result via the handler’s CustomIsEmptyValueEventArgs.IsEmpty parameter and set the Handled parameter to true.

Note

You cannot use this event in a .NET application. Refer to the following section for more information: How to Subscribe to Validation Events