Change context menu in WPF TreeView for data

This is example for ListBox, I think you can easily modify it to work with TreeView.

XAML:

...<Window.Resources>    <ContextMenu x:Key="FileContextMenu">        ...    </ContextMenu>    <ContextMenu x:Key="DirContextMenu">        ...    </ContextMenu>    <local:ItemToContextMenuConverter x:Key="ContextMenuConverter" />        </Window.Resources>...<ListBox x:Name="SomeList">    <ListBox.ItemTemplate>        <DataTemplate>                                      <Label Content="{Binding Path=Name}" ContextMenu="{Binding Converter={StaticResource ContextMenuConverter}}"/>        </DataTemplate>    </ListBox.ItemTemplate></ListBox>

Code:

class Item{    public string Name { get; set; }    public bool IsFile { get; set; }}[ValueConversion(typeof(Item), typeof(ContextMenu))]public class ItemToContextMenuConverter : IValueConverter{    public static ContextMenu FileContextMenu;    public static ContextMenu DirContextMenu;    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)    {        Item item = value as Item;        if (item == null) return null;        return item.IsFile ? FileContextMenu : DirContextMenu;    }    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)    {        throw new Exception("The method or operation is not implemented.");    }}private void Window_Loaded(object sender, RoutedEventArgs e)    {        ItemToContextMenuConverter.FileContextMenu             = this.Resources["FileContextMenu"] as ContextMenu;        ItemToContextMenuConverter.DirContextMenu             = this.Resources["DirContextMenu"] as ContextMenu;        List<Item> items = new List<Item>();        items.Add(new Item() { Name = "First", IsFile = true });        items.Add(new Item() { Name = "Second", IsFile = false });        SomeList.ItemsSource = items;    }

Hi I am doing similar thing on TreeView and I don't like that ItemToContextMenuConverter is executed on each item even if it is not used. It's maybe ok in a small project but if you add Enable/Disable code for each MenuItem than it can be slow.

This is maybe not the best (I just started with WPF), but I will share it with you.

Menu Resources:

<Window.Resources>  <ContextMenu x:Key="MnuFolderFavorites" StaysOpen="True">    <MenuItem Header="Remove from Favorites" Click="MnuFolder_RemoveFromFavorites_Click"></MenuItem>  </ContextMenu>  <ContextMenu x:Key="MnuFolder" StaysOpen="True">    <MenuItem Header="New Folder"></MenuItem>    <MenuItem Header="Rename" x:Name="MnuFolderRename" Click="MnuFolder_Rename_Click"></MenuItem>    <MenuItem Header="Add to Favorites" Click="MnuFolder_AddToFavorites_Click"></MenuItem>  </ContextMenu></Window.Resources>

TreeView:

<TreeView x:Name="TvFolders">  <TreeView.ItemTemplate>    <HierarchicalDataTemplate DataType="{x:Type data:Folder}" ItemsSource="{Binding Items}">      <StackPanel Orientation="Horizontal" PreviewMouseRightButtonDown="TvFoldersStackPanel_PreviewMouseRightButtonDown">        <Image Width="20" Height="20" Source="{Binding ImagePath}" />        <TextBlock Text="{Binding Title}" Margin="5,0,0,0" />      </StackPanel>    </HierarchicalDataTemplate>  </TreeView.ItemTemplate></TreeView>

Code:

private void TvFoldersStackPanel_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e) {  ((StackPanel) sender).ContextMenu = null;  Data.Folder item = (Data.Folder) ((StackPanel) sender).DataContext;  if (!item.Accessible) return;  if (item.Parent != null && item.Parent.Title.Equals("Favorites")) {    ((StackPanel) sender).ContextMenu = MainWindow.Resources["MnuFolderFavorites"] as ContextMenu;  } else {    ((StackPanel) sender).ContextMenu = MainWindow.Resources["MnuFolder"] as ContextMenu;    foreach (MenuItem menuItem in ((StackPanel) sender).ContextMenu.Items) {      switch (menuItem.Name) {        case "MnuFolderRename": {          menuItem.IsEnabled = item.Parent != null;          break;        }      }    }  }}private void MnuFolder_RemoveFromFavorites_Click(object sender, RoutedEventArgs e) {  string path = ((Data.Folder)((MenuItem)sender).DataContext).FullPath;  Settings.Default.FolderFavorites.Remove(path);  Settings.Default.Save();  FavoritesFolder?.AddFavorites(true);}