TreeListView.InvalidNodeException Event

Fires when a node fails validation, or when it cannot be saved to a data source.

Namespace: DevExpress.Xpf.Grid

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

Declaration

public event TreeListInvalidNodeExceptionEventHandler InvalidNodeException
Public Event InvalidNodeException As TreeListInvalidNodeExceptionEventHandler

Event Data

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

Property Description
ErrorText Gets or sets the error description.
Exception Gets the exception that raised the TreeListView.InvalidNodeException event.
ExceptionMode Gets or sets a value that specifies how an exception should be handled.
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.
Node Gets the processed node. Inherited from TreeListNodeEventArgs.
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.
Row Gets the processed row. Inherited from TreeListNodeEventArgs.
Source Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.
WindowCaption Gets or sets the error window's caption.

Remarks

Node validation is performed within the TreeListView.ValidateNode event handler, when a node is about to lose focus. The InvalidNodeException event allows you to override the default error presentation. This event occurs after the TreeListView.ValidateNode event (provided that the focused node's validation has failed).

Use the event parameter's TreeListInvalidNodeExceptionEventArgs.ExceptionMode property, to specify the action performed in response to entering an invalid value. You can display a message box with an error description, suppress any action, throw an exception or discard new data and revert to an old value.

To learn more, see Row Validation.

See Also