wpf-devexpress-dot-xpf-dot-grid-dot-gridviewbase-aa0474b5.md
Allows you to validate rows, check database constraints, and delete rows from the database before a user deletes a row from the Data Grid.
Namespace : DevExpress.Xpf.Grid
Assembly : DevExpress.Xpf.Grid.v25.2.dll
NuGet Package : DevExpress.Wpf.Grid.Core
public event EventHandler<GridValidateRowDeletionEventArgs> ValidateRowDeletion
Public Event ValidateRowDeletion As EventHandler(Of GridValidateRowDeletionEventArgs)
The ValidateRowDeletion event's data class is GridValidateRowDeletionEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| DisplayErrorMode | Gets or sets whether to display an error message. |
| 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. |
| OriginalSource | Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs. |
| Result | Gets or sets information about the error (its type and description). |
| ResultAsync | Gets or sets a task that asynchronously deletes rows from the underlying data source (database). |
| RoutedEvent | Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs. |
| RowHandles | Gets handles of rows that a user wants to delete. |
| Rows | Gets rows that a user wants to delete. |
| Source | Gets a control ( GridControl or TreeListControl ) that raised the event. |
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. |
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.
View Example: How to Implement CRUD Operations in a Data-Bound Grid
The following code snippets (auto-collected from DevExpress Examples) contain references to the ValidateRowDeletion 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.
wpf-data-grid-implement-crud-operations/CS/CodeBehind/EFCore/LocalData/MainWindow.xaml#L27
<dxg:TableView NewItemRowPosition="Top" ShowUpdateRowButtons="OnCellEditorOpen"
ValidateRow="OnValidateRow" ValidateRowDeletion="OnValidateRowDeletion"
DataSourceRefresh="OnDataSourceRefresh" ShowFixedTotalSummary="True" />
wpf-data-grid-bind-to-infiniteasyncsource/CS/InfiniteAsyncSourceSample/MainWindow.xaml#L43
ValidateRow="CreateUpdateRow"
ValidateRowDeletion="DeleteRows"
x:Name="view"/>
wpf-data-grid-extend-crud-operations/CS/Undo/UndoCRUDOperationsBehavior.cs#L42
AssociatedObject.ValidateRow += OnRowAddedOrEdited;
AssociatedObject.ValidateRowDeletion += OnRowDeleted;
AssociatedObject.RowEditStarted += OnEditingStarted;
wpf-data-grid-extend-crud-operations/VB/Undo/UndoCRUDOperationsBehavior.vb#L68
AddHandler AssociatedObject.ValidateRow, AddressOf OnRowAddedOrEdited
AddHandler AssociatedObject.ValidateRowDeletion, AddressOf OnRowDeleted
AddHandler AssociatedObject.RowEditStarted, AddressOf OnEditingStarted
See Also