GridViewBase.ValidateRowDeletion Event

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.v23.2.dll

NuGet Package: DevExpress.Wpf.Grid.Core

Declaration

C#

public event EventHandler<GridValidateRowDeletionEventArgs> ValidateRowDeletion

VB.NET

Public Event ValidateRowDeletion As EventHandler(Of GridValidateRowDeletionEventArgs)

Event Data

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.

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.

View Example: How to Implement CRUD Operations in a Data-Bound Grid

Related GitHub Examples

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.

XAML

wpf-data-grid-implement-crud-operations/CS/CodeBehind/EFCore/InfiniteAsyncSource/MainWindow.xaml#L27

<dxg:TableView NewItemRowPosition="Top" ShowUpdateRowButtons="OnCellEditorOpen"
               ValidateRow="OnValidateRow" ValidateRowDeletion="OnValidateRowDeletion"
               ShowFixedTotalSummary="True" DataSourceRefresh="OnDataSourceRefresh" />

wpf-data-grid-bind-to-infiniteasyncsource/CS/InfiniteAsyncSourceSample/MainWindow.xaml#L43

ValidateRow="CreateUpdateRow"
ValidateRowDeletion="DeleteRows"
x:Name="view"/>

C#

wpf-data-grid-extend-crud-operations/CS/Undo/UndoCRUDOperationsBehavior.cs#L42

AssociatedObject.ValidateRow += OnRowAddedOrEdited;
AssociatedObject.ValidateRowDeletion += OnRowDeleted;
AssociatedObject.RowEditStarted += OnEditingStarted;

VB.NET

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