TreeListView.ValidateCell Event

Enables you to specify whether the focused cell's data is valid, and whether the cell's editor can be closed.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v14.2.dll

Declaration

C#

public event TreeListCellValidationEventHandler ValidateCell

VB.NET

Public Event ValidateCell As TreeListCellValidationEventHandler

Event Data

The ValidateCell event's handler receives an argument of the TreeListCellValidationEventArgs type. The following properties provide information specific to this event:

Property	Description
Cell	Gets or sets the CellValue object consisting of information about the cell being processed.
CellValue	Gets the cell's old valid value.
Column	Gets a column whose cell is validated.
Culture	Gets the culture related to the validation. Inherited from ValidationEventArgs.
ErrorContent	Gets or sets an object that describes the validation error. Inherited from ValidationEventArgs.
ErrorType	Gets or sets the error type. Inherited from ValidationEventArgs.
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.
IsValid	Gets or sets a value specifying whether the value is valid. Inherited from ValidationEventArgs.
Node	Gets the processed node. Inherited from TreeListNodeValidationEventArgs.
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 TreeListNodeValidationEventArgs.
Source	Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.
UpdateSource	Gets an object that invoked the BaseEdit.Validate event. Inherited from ValidationEventArgs.
Value	Gets the editor's new value. Inherited from ValidationEventArgs.

Remarks

The ValidateCell event occurs before the focused cell's modified value is posted to a data source, allowing to manually validate its new value.

The focused cell's new value is returned by the ValidationEventArgs.Value property. Its previously valid value is returned by the TreeListCellValidationEventArgs.CellValue property. To indicate that the new value is invalid, set the ValidationEventArgs.IsValid property to false.