How can I trigger when I leave the ComboBox?

Question

so Ive got an DataGrid and in that i got a DataGridTemplateColumn. In that template Column i placed an ComboBox in it. The ComboBox got his Data from my ObservableCollections from my ViewModel. So that my Code look like that now:

 <DataGridTemplateColumn Header="Status" Width="100">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox x:Name="cbStatus"
                                          ItemsSource="{Binding Path=ocLieferumfangStati, ElementName=vmLieferumfang}"
                                Width="100" HorizontalAlignment="Left" 
                                          DisplayMemberPath="Beschreibung"
                                          SelectedValue="{Binding Status}"
                                          SelectedValuePath="Status" />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>

But what I want to do now is, to have an Event what triggering when I leave the ComboBox. Something like the DataGrid event CellEditEnding.

What I already tried is in my MVVM this:

ocLieferumfangStati.CollectionChanged += (sender, e) =>
        {
            if (e.Action == NotifyCollectionChangedAction.Add)
            {
                MessageBox.Show("ADD");
            }
            if (e.Action == NotifyCollectionChangedAction.Move)
            {
                MessageBox.Show("Move");
            }
            if (e.Action == NotifyCollectionChangedAction.Remove)
            {
                MessageBox.Show("Remove");
            }
            if (e.Action == NotifyCollectionChangedAction.Replace)
            {
                MessageBox.Show("Replace");
            }
        };

But there only the Remove Action triggerd.

I can not write in the ComboBox, I can only choose the Items that are in the ComboBox. So how can I give out an MessageBox when I'm leaving the ComboBox? So that when I click out of the ComboBox an MessageBox is triggering.

By "leave" you mean "lose focus"? https://stackoverflow.com/questions/27820278/wpf-lostfocus-event-of-textbox — gunr2171, Aug 20 '21 at 12:32
Yes, but "tap out" isn't an event. There are a number of more specific events that get triggered when you perform such an action. — gunr2171, Aug 20 '21 at 12:42

score 0 · Accepted Answer · answered Aug 20 '21 at 12:36

0

I think you want PreviewLostKeyboardFocus or LostKeyboardFocus, So here check Detect when a ListBoxItem is in the SelectedUnfocused state and WPF Combobox lostfocus event become an Infinite lopp

answered Aug 20 '21 at 12:36

CorrM

498
6
18

that got triggerd when I try to open the ComboBox – Aug 20 '21 at 12:47

How can I trigger when I leave the ComboBox?

1 Answers1