wpf-devexpress-dot-xpf-dot-editors-dot-lookupeditbase-fd633686.md
Allows a new value entered into the edit box, to be added to the items source.
Namespace : DevExpress.Xpf.Editors
Assembly : DevExpress.Xpf.Core.v25.2.dll
NuGet Package : DevExpress.Wpf.Core
public event ProcessNewValueEventHandler ProcessNewValue
Public Event ProcessNewValue As ProcessNewValueEventHandler
The ProcessNewValue event's data class is ProcessNewValueEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| DisplayText | Gets the text entered by an end-user within the editor’s edit box. |
| 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. |
| PostponedValidation | Gets or sets whether to postpone edit value validation. |
| 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. |
The event data class exposes the following methods:
| Method | Description |
|---|---|
| InvokeEventHandler(Delegate, Object) | When overridden in a derived class, provides a way to invoke event handlers in a type-specific way, which can increase efficiency over the base implementation. Inherited from RoutedEventArgs. |
| OnSetSource(Object) | When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes. Inherited from RoutedEventArgs. |
View Example: WPF LookUpEdit - Process New Values
If the editor cannot find an item that matches the text entered by an end-user within the edit box (ProcessNewValueEventArgs.DisplayText), the ProcessNewValue event occurs. Handle this event to manually validate a new value, and if required, add the corresponding record to a data source.
The ProcessNewValue event is raised after a new value has been validated, allowing you to add this value to the items source. By default, the validation occurs while typing within the editor’s text box (see BaseEdit.ValidateOnTextInput). As a result, the ProcessNewValue event is fired each time a user presses a keyboard key.
The ProcessNewValue event occurs if an end-user presses the Enter key (the BaseEdit.ValidateOnEnterKeyPressed property should be set to true ) or moves focus to another control.
If you add a new record, set the event parameter’s Handled property to true.
Note
If you want to show a floating container allowing an end-user to specify other values for a new record, set the event parameter’s ProcessNewValueEventArgs.PostponedValidation property to true. In this instance, a new value will be validated after a floating container is closed.
See Also