wpf-devexpress-dot-xpf-dot-grid-dot-gridcontrol-e1735ed4.md
Occurs after the grouping operation has been completed. This is a routed event.
Namespace : DevExpress.Xpf.Grid
Assembly : DevExpress.Xpf.Grid.v25.2.dll
NuGet Package : DevExpress.Wpf.Grid.Core
public event RoutedEventHandler EndGrouping
Public Event EndGrouping As RoutedEventHandler
The EndGrouping event's data class is RoutedEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| Handled | Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. |
| OriginalSource | Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. |
| RoutedEvent | Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. |
| Source | Gets or sets a reference to the object 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. |
| 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. |
Each time the grid’s data is grouped or ungrouped by a column, the grid does the following:
GridControl.EndGrouping event.Since data grouping requires sorting, the GridControl.StartSorting and GridControl.EndSorting events are also raised before and after grouping.
To learn more, see Grouping.
The following example does not allow users to collapse the Status: Invalidated group row and expand the Status: Delivered group row.
View Example: Forbid Expand and Collapse Operations for Group Rows
<dxg:GridControl x:Name="grid"
EndGrouping="OnEndGrouping"
GroupRowCollapsing="OnGroupRowCollapsing"
GroupRowCollapsed="OnGroupRowCollapsed"
GroupRowExpanding="OnGroupRowExpanding"
GroupRowExpanded="OnGroupRowExpanded">
<dxg:GridColumn FieldName="ProductName"/>
<dxg:GridColumn FieldName="Price"/>
<dxg:GridColumn FieldName="Discount"/>
<dxg:GridColumn FieldName="Status" GroupIndex="0" SortOrder="Descending"/>
<dxg:GridControl.View>
<dxg:TableView x:Name="view" GroupValueTemplateSelector="{StaticResource groupRowTemplateSelector}"/>
</dxg:GridControl.View>
</dxg:GridControl>
void OnEndGrouping(object sender, RoutedEventArgs e) {
if (grid.Columns[nameof(Invoice.Status)].GroupIndex == 0) {
var childRow = grid.FindRowByValue(grid.Columns[nameof(Invoice.Status)], InvoiceStatus.Invalidated);
var groupRow = grid.GetParentRowHandle(childRow);
grid.ExpandGroupRow(groupRow);
childRow = grid.FindRowByValue(grid.Columns[nameof(Invoice.Status)], InvoiceStatus.Delivered);
groupRow = grid.GetParentRowHandle(childRow);
grid.CollapseGroupRow(groupRow);
}
}
void OnGroupRowCollapsing(object sender, RowAllowEventArgs e) {
if (e.Row != null && grid.GetGroupRowValue(e.RowHandle).Equals(InvoiceStatus.Invalidated))
e.Allow = false;
}
void OnGroupRowCollapsed(object sender, RowEventArgs e) {
if (e.Row == null && grid.Columns[nameof(Invoice.Status)].GroupIndex == 0) {
var childRow = grid.FindRowByValue(grid.Columns[nameof(Invoice.Status)], InvoiceStatus.Invalidated);
var groupRow = grid.GetParentRowHandle(childRow);
grid.ExpandGroupRow(groupRow);
}
}
void OnGroupRowExpanding(object sender, RowAllowEventArgs e) {
if (e.Row != null && grid.GetGroupRowValue(e.RowHandle).Equals(InvoiceStatus.Delivered))
e.Allow = false;
}
void OnGroupRowExpanded(object sender, RowEventArgs e) {
if (e.Row == null && grid.Columns[nameof(Invoice.Status)].GroupIndex == 0) {
var childRow = grid.FindRowByValue(grid.Columns[nameof(Invoice.Status)], InvoiceStatus.Delivered);
var groupRow = grid.GetParentRowHandle(childRow);
grid.CollapseGroupRow(groupRow);
}
}
Private Sub OnEndGrouping(ByVal sender As Object, ByVal e As RoutedEventArgs)
If Me.grid.Columns(NameOf(Invoice.Status)).GroupIndex = 0 Then
Dim childRow = Me.grid.FindRowByValue(Me.grid.Columns(NameOf(Invoice.Status)), InvoiceStatus.Invalidated)
Dim groupRow = Me.grid.GetParentRowHandle(childRow)
Me.grid.ExpandGroupRow(groupRow)
childRow = Me.grid.FindRowByValue(Me.grid.Columns(NameOf(Invoice.Status)), InvoiceStatus.Delivered)
groupRow = Me.grid.GetParentRowHandle(childRow)
Me.grid.CollapseGroupRow(groupRow)
End If
End Sub
Private Sub OnGroupRowCollapsing(ByVal sender As Object, ByVal e As RowAllowEventArgs)
If e.Row IsNot Nothing AndAlso Me.grid.GetGroupRowValue(e.RowHandle).Equals(InvoiceStatus.Invalidated) Then e.Allow = False
End Sub
Private Sub OnGroupRowCollapsed(ByVal sender As Object, ByVal e As RowEventArgs)
If e.Row Is Nothing AndAlso Me.grid.Columns(NameOf(Invoice.Status)).GroupIndex = 0 Then
Dim childRow = Me.grid.FindRowByValue(Me.grid.Columns(NameOf(Invoice.Status)), InvoiceStatus.Invalidated)
Dim groupRow = Me.grid.GetParentRowHandle(childRow)
Me.grid.ExpandGroupRow(groupRow)
End If
End Sub
Private Sub OnGroupRowExpanding(ByVal sender As Object, ByVal e As RowAllowEventArgs)
If e.Row IsNot Nothing AndAlso Me.grid.GetGroupRowValue(e.RowHandle).Equals(InvoiceStatus.Delivered) Then e.Allow = False
End Sub
Private Sub OnGroupRowExpanded(ByVal sender As Object, ByVal e As RowEventArgs)
If e.Row Is Nothing AndAlso Me.grid.Columns(NameOf(Invoice.Status)).GroupIndex = 0 Then
Dim childRow = Me.grid.FindRowByValue(Me.grid.Columns(NameOf(Invoice.Status)), InvoiceStatus.Delivered)
Dim groupRow = Me.grid.GetParentRowHandle(childRow)
Me.grid.CollapseGroupRow(groupRow)
End If
End Sub
The following code snippet (auto-collected from DevExpress Examples) contains a reference to the EndGrouping 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.
<dxg:GridControl x:Name="grid"
EndGrouping="OnEndGrouping"
GroupRowCollapsing="OnGroupRowCollapsing"
#ExternalSource("..\..\MainWindow.xaml",19)
AddHandler Me.grid.EndGrouping, New System.Windows.RoutedEventHandler(AddressOf Me.OnEndGrouping)
See Also