Wsrtjtyk

Name1(tree node)
Car1(child)
Car2(child)
Car3(child)
Name2(tree node)
Car4(child)
Car5(child)
Car6(child)

It's possible to display only the children in a tree-view scenario using Test_Filter(object sender, FilterEventArgs e)?

<CollectionViewSource

            x:Key="treeSource"

            Filter="TreeViewCollectionViewSource_Filter" 

            IsLiveFilteringRequested="True"

            Source="{Binding Path=NameModel}" 

          >            

        </CollectionViewSource>

        ***********

        <TreeView 

                  ItemsSource="{Binding Source={StaticResource treeSource}}"   

                  SnapsToDevicePixels="True"

                  VirtualizingStackPanel.IsVirtualizing="True"

                  VirtualizingStackPanel.VirtualizationMode="Recycling" KeyDown="nameTreeview_KeyDown">

            <TreeView.ItemTemplate>

                <HierarchicalDataTemplate ItemsSource="{Binding NameModel}">

                    <TextBlock

                        FontFamily="Segoe UI"

                        Foreground="Blue"

                        Text="{Binding SomeProperty}" />

                    <HierarchicalDataTemplate.ItemTemplate>

                        <DataTemplate>

                            <TextBlock Text="{Binding CarModel}" />

                        </DataTemplate>

                    </HierarchicalDataTemplate.ItemTemplate>

                </HierarchicalDataTemplate>

            </TreeView.ItemTemplate>

            </TreeView>

In code:

    private void Search_TextChanged(object sender, TextChangedEventArgs e) => this.RefreshDS();private void RefreshDS() => this.WhenIdle(

          () =>

          {

              if (this.TryFindResource("treeSource") is CollectionViewSource cvs)

              {

                  cvs?.View?.Refresh();

              }

          });



    private void TreeViewCollectionViewSource_Filter(object sender, FilterEventArgs e)

    {

        if (string.IsNullOrWhiteSpace(this.Search.Text))

        {

            e.Accepted = true;

            return;

        }



        if (!(e.Item is NameMVVMModel item))

        {

            e.Accepted = false;

        }

        else

        {

            var searchTerm = this.Search.Text;

            //list that contains every car

            var t = item.NameModel; 

            foreach (var item1 in t)

            {

                e.Accepted = 

        item1.Car?.CurrentCultureContainsInsensitive(searchTerm) ?? false;

            }

        }

    }`

For the moment I can filter only "Names" but I want to filter Cars in my example( Names contains list of "Cars" It is possible to filter Cars using my approach?