GridViewBase.CellValueChanging Event

Fires in response to changing the edit value.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v18.2.dll

Declaration

C#

public event CellValueChangedEventHandler CellValueChanging

VB.NET

Public Event CellValueChanging As CellValueChangedEventHandler

Event Data

The CellValueChanging event's data class is CellValueChangedEventArgs. 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. Inherited from CellValueEventArgs.
Column	Gets a column that contains the edited cell. Inherited from CellValueEventArgs.
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.
OldValue	Gets the cell’s previous value.
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 RowEventArgs.
RowHandle	Gets the processed row’s handle. Inherited from RowEventArgs.
Source	Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.
Value	Gets or sets the processed cell’s value. Inherited from CellValueEventArgs.

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

The CellValueChanging event is raised each time the edited value is being changed (an end-user types or deletes a character, chooses a value from the dropdown list, etc.). The event provides a parameter whose properties can be used to identify the row and column containing the edited cell and its current value.

The CellValueChanging event doesn’t fire when changing cell values in code. Handle this event if you need to provide an immediate response to end-user actions. For instance, you may close the editor and focus the next cell when the edit value’s length exceeds the predefined value.

To learn more, see Obtain and Set Cell Values.

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the CellValueChanging 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.

C#

how-to-emulate-binding-to-the-isexpanded-property-of-the-treelistnode-t127638/CS/DevExpress.Example04/MainWindow.xaml#L43

<dxg:GridControl.View>
    <dxg:TableView CellValueChanging="TableView_CellValueChanging" AllowGrouping="False"/>
</dxg:GridControl.View>

how-to-post-values-to-underlying-data-properties-immediately-after-changing-a-cell-value-e1801/CS/DXGrid_AssignComboBoxToColumn/Window1.xaml#L21

<dxg:GridControl.View>
    <dxg:TableView AutoWidth="True" CellValueChanging="TableView_CellValueChanging" />
</dxg:GridControl.View>

how-to-add-a-check-box-into-a-column-header-to-select-deselect-all-rows-e3840/CS/WpfApplication2/MainWindow.xaml#L66

<dxg:GridControl.View>
    <dxg:TableView x:Name="view" AutoWidth="True" CellValueChanging="view_CellValueChanging" />
</dxg:GridControl.View>

how-to-create-checkable-grouping-in-gridcontrol-t127563/CS/DevExpress.Example03/CheckableGroupBehavior.cs#L114

    (this.AssociatedObject.View as TableView).CellValueChanged += GridCellValueChanged;
    (this.AssociatedObject.View as TableView).CellValueChanging += CellValueChanging;
}

VB.NET

how-to-create-checkable-grouping-in-gridcontrol-t127563/VB/DevExpress.Example03/CheckableGroupBehavior.vb#L122

    AddHandler TryCast(Me.AssociatedObject.View, TableView).CellValueChanged, AddressOf GridCellValueChanged
    AddHandler TryCast(Me.AssociatedObject.View, TableView).CellValueChanging, AddressOf CellValueChanging
End Sub