TreeListView.ValidateNodeDeletion Event
Allows you to validate nodes, check database constraints, and delete nodes from the database before a user deletes a node from the Data Grid.
Namespace: DevExpress.Xpf.Grid
Assembly: DevExpress.Xpf.Grid.v24.2.dll
NuGet Package: DevExpress.Wpf.Grid.Core
#Declaration
public event EventHandler<TreeListValidateNodeDeletionEventArgs> ValidateNodeDeletion
#Event Data
The ValidateNodeDeletion event's data class is TreeListValidateNodeDeletionEventArgs. The following properties provide information specific to this event:
Property | Description |
---|---|
Display |
Gets or sets whether to display an error message.
Inherited from Grid |
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 Routed |
Nodes | Gets nodes a user wants to delete. |
Original |
Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class.
Inherited from Routed |
Result |
Gets or sets information about the error (its type and description).
Inherited from Grid |
Result |
Gets or sets a task that asynchronously deletes rows from the underlying data source (database).
Inherited from Grid |
Routed |
Gets or sets the Routed |
Row |
Gets handles of rows that a user wants to delete.
Inherited from Grid |
Rows |
Gets rows that a user wants to delete.
Inherited from Grid |
Source |
Gets or sets a reference to the object that raised the event.
Inherited from Routed |
The event data class exposes the following methods:
Method | Description |
---|---|
Invoke |
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 Routed |
On |
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 Routed |
#Remarks
#CRUD Operations
You can implement CRUD operations (create, read update, delete). These operations allow users to manage data in the Data Grid. Refer to the following topic for more information: Implement CRUD Operations in a Data-Bound Grid.