TreeListView.CellValueChanging Event
Fires in response to changing the edit value.
Namespace: DevExpress.Xpf.Grid
Assembly: DevExpress.Xpf.Grid.v19.2.dll
Declaration
Event Data
The CellValueChanging event's data class is TreeListCellValueChangedEventArgs. 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 TreeListCellValueEventArgs. |
| Column | Gets a column that contains the edited cell. Inherited from TreeListCellValueEventArgs. |
| 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. |
| 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 TreeListNodeEventArgs. |
| 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 TreeListCellValueEventArgs. |
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 a cell’s value is being edited (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 node and column containing the edited cell, and its current value.
The CellValueChanging event does not 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.
After a cell’s value has been changed, the TreeListView.CellValueChanged event is raised.
To learn more, see Obtain and Set Cell Values.