PropertyGridControl.ValidateCell Event

Enables you to specify whether the focused cell’s data is valid, and whether the node can lose focus.

Namespace: DevExpress.Xpf.PropertyGrid

Assembly: DevExpress.Xpf.PropertyGrid.v21.2.dll

NuGet Package: DevExpress.Wpf.PropertyGrid

Declaration

C#

public event ValidateCellEventHandler ValidateCell

VB.NET

Public Event ValidateCell As ValidateCellEventHandler

Event Data

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

Property	Description
ErrorContent	Gets or sets an object that describes the validation error.
ErrorType	Gets the error type.
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.
NewValue	Gets a new value of the cell to be validated.
OldValue	Gets the previous value of the cell to be validated.
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 information about a row that contains a validated cell.
Source	Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.
ValidationException	Gets or sets the error message that is displayed if the cell has failed validation.

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.

Remarks

Validation is performed within the ValidateCell event handler. This event is automatically fired when a cell is about to lose focus.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the ValidateCell event.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

XAML

how-to-validate-data-in-propertygridcontrol-t324548/CS/MainWindow.xaml#L17

    </Window.DataContext>
    <dxprg:PropertyGridControl SelectedObject="{Binding Path=Contact}" ShowCategories="False" ValidateCell="PropertyGridControl_ValidateCell"/>
</Window>