WPF TreeView - Context Menu on TreeViewItem doesn't appear

Question

I have a user control with a TreeView where the nodes are generated dinamically (in fact I use the HierarchicalDataTemplate property), depending on the structure of an input XML. If I click with the left button on the single node, the content of that part of XML appears on a separate user control. The single node is visualized through the property Header of a TreeViewItem.

What I would like to add, is a logic with the right button that simply shows a contextual menu with few commands on that single node.

I searched for some material online (as I'm quite new to WPF) and tried first to define a context Menu...

1st solution XAML:

<TreeView x:Name="treeViewStruttura" Panel.ZIndex="1" HorizontalAlignment="Left" VerticalContentAlignment="Top" Width="200" Height="Auto">
  <TreeView.ItemTemplate>
    <HierarchicalDataTemplate ItemsSource="{Binding Children}">
      <HierarchicalDataTemplate.Resources>
        <Style TargetType="{x:Type TreeViewItem}">
          <EventSetter Event="PreviewMouseLeftButtonDown" Handler="OnTreeNodeMouseClick" />
          <EventSetter Event="PreviewMouseRightButtonDown" Handler="OnTreeNodeMouseRightClick"/>
          <Style.Triggers>
            <Trigger Property="IsMouseOver" Value="True">
              <Setter Property="BorderBrush" Value="LightGray" />
            </Trigger>
          </Style.Triggers>
          <Style.Resources>
            <Style TargetType="Border">
              <Setter Property="CornerRadius" Value="4"/>
              <Setter Property="BorderThickness" Value="4"/>
            </Style>
          </Style.Resources>
        </Style>
      </HierarchicalDataTemplate.Resources>
      <TreeViewItem Header="{Binding Text}" x:Name="treeViewItem" HorizontalAlignment="Left" HorizontalContentAlignment="Left"
                BorderThickness="2">
        <TreeViewItem.ContextMenu>
            <ContextMenu IsEnabled="True" IsOpen="True" >
              <MenuItem Command="ModificaArticolo"  />
              <MenuItem x:Name="menuItemCopy" Header="Copy" Command="Copy" Tag="0"/>
            </ContextMenu>
          </TreeViewItem.ContextMenu>
      </TreeViewItem>
    </HierarchicalDataTemplate>
  </TreeView.ItemTemplate>
</TreeView>

Codebehind:

public partial class DocumentView : UserControl
{
    public DocumentView()
    {
        InitializeComponent();
        PreviewMouseRightButtonDown += DocumentView_PreviewMouseRightButtonDown;

    }

    void DocumentView_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
    {
        MenuClick();
    }

    private void MenuClick()
    {
        ContextMenu menu = new ContextMenu();

        var copyMenuItem = new MenuItem();
        copyMenuItem.Command = System.Windows.Input.ApplicationCommands.Copy;
        copyMenuItem.Header = "Copy";
        menu.Items.Add(copyMenuItem);
        menu.Visibility = System.Windows.Visibility.Visible;

        menu.IsEnabled = true;
        menu.IsOpen = true;
        menu.Focusable = true;
    }
}

Second solution, I tried to define a Context Menu outside the XAML TreeView:

<ContextMenuService.ContextMenu>
        <ContextMenu x:Name="contextMenuTreeViewItem">
            <Style TargetType="{x:Type TreeViewItem}" >
            </Style>
            <MenuItem x:Name="menuItemCopy" Header="Copy" Command="Copy" Tag="0"/>
        </ContextMenu>
</ContextMenuService.ContextMenu>

CodeBehind:

private void MenuClick()
{
    this.contextMenuTreeViewItem.IsOpen = true;
    this.contextMenuTreeViewItem.IsEnabled = true;
    this.menuItemCopy.IsEnabled = true;
    this.contextMenuTreeViewItem.StaysOpen = true;
}

I'm sure I'm doing something wrong but I can't say what precisely...plus I saw the use of property ContextMenu as a Setter Property...and I can't appreciate the differences on this approach.

Thx in advance for your help.

Answer 1

This comes years later but given that no answer was proposed, perhaps someone may benefit from this. What has worked for me is to define a context menu in the TreeView.Resources section and give it a key for identification, as follows:

        <TreeView.Resources>
            <ContextMenu x:Key="ChildContextMenu">
                <MenuItem Header="View"/>
                <MenuItem Header="Edit"/>
                <MenuItem Header="Print"/>
                <MenuItem Header="Delete"/>
                <MenuItem Header="Batch actions">
                    <MenuItem Header="View all"/>
                    <MenuItem Header="Edit all"/>
                    <MenuItem Header="Print all"/>
                    <MenuItem Header="Delete all"/>
                </MenuItem>
            </ContextMenu>
        </TreeView.Resources>

The above context menu can then be attached to whichever control used as a TreeViewItem, as follows (here I set the context menu on the TextBlock):

        <TreeView.ItemTemplate>
            <HierarchicalDataTemplate DataType="{x:Type local:Sample}" ItemsSource="{Binding Path=Children}">
                <TextBlock Text="{Binding Path=Parent}"/>
                <HierarchicalDataTemplate.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding Path=Name}" ContextMenu="{StaticResource ChildContextMenu}"/>
                    </DataTemplate>
                </HierarchicalDataTemplate.ItemTemplate>
            </HierarchicalDataTemplate>
        </TreeView.ItemTemplate>

The complete code becomes:

<TreeView>
            <TreeView.Resources>
                <ContextMenu x:Key="ChildContextMenu">
                    <MenuItem Header="View"/>
                    <MenuItem Header="Edit"/>
                    <MenuItem Header="Print"/>
                    <MenuItem Header="Delete"/>
                    <MenuItem Header="Batch actions">
                        <MenuItem Header="View all"/>
                        <MenuItem Header="Edit all"/>
                        <MenuItem Header="Print all"/>
                        <MenuItem Header="Delete all"/>
                    </MenuItem>
                </ContextMenu>
            </TreeView.Resources>
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate DataType="{x:Type local:Sample}" ItemsSource="{Binding Path=Children}">
                    <TextBlock Text="{Binding Path=Parent}"/>
                    <HierarchicalDataTemplate.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Path=Name}" ContextMenu="{StaticResource ChildContextMenu}"/>
                        </DataTemplate>
                    </HierarchicalDataTemplate.ItemTemplate>
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
</TreeView>

The logic to handle clicks can be attached in various ways, one of them being per MenuItem. I hope this helps.