In v10 I'm using

MenuRenderingNotification

to add a menu item (in this case to the DataTypes tree). This all works. But I only want to add my menu item when the item is actually a DataType and not a Folder (Container). The

Notification

object has stuff like

NodeId

and the tree alias, but how do I tell if the node being clicked on is a folder so I can avoid?

I don't think there is anything directly in the notification, I do this :

if (int.TryParse(notification.NodeId, out int nodeId))
{
   var container = _entityService.Get(nodeId);
   if (container != null && containerTypes.Contains(container.NodeObjectType))

where containerTypes is an array of the 'container type values'

private Guid[] containerTypes = new Guid[]
{
    UmbracoObjectTypes.DocumentTypeContainer.GetGuid(),
    UmbracoObjectTypes.DataTypeContainer.GetGuid(),
    UmbracoObjectTypes.MediaTypeContainer.GetGuid()
};

@Kevin Jump Thanks! I should have guessed you'd have worked it out. Though it does seem like something that should be a part of the existing

Notification

metadata.

yeah - it probably should include at least the nodeObjectType so you can work it out.