How to mix databound and static levels in a TreeView?

Question

I have a collection of Database objects, each containing collections of Schema objects and User objects. I want to bind them to a TreeView, but adding

Answer 1

The problem is that a TreeView is not very well suited to what you want to acomplish: It expects all the subnodes to be of the same type. As your database node has a node of type Collection> and of type Collection> you cannot use a HierarchicalDataTemplate. A Better approach is to use nested expanders that contain ListBoxes.

The code below does what you want I think,while being as close as possible to your original intent:

    
        
        
                
                    
                        
                    
                    
                    
                
                 
        
        
            
        
        
            
        
    
    
        
        
    


using System.Collections.ObjectModel;
using System.Windows;

namespace TreeViewSelection
{
    public partial class Window1 : Window
    {
        public ObservableCollection DataBases { get; set; }
        public Window1()
        {
            InitializeComponent();
            DataBases = new ObservableCollection
                            {
                                new Database("Db1"),
                                new Database("Db2")
                            };
            DataContext = this;
        }
    }

    public class Database:DependencyObject
    {
        public string Name { get; set; }
        public ObservableCollection Schemas { get; set; }
        public ObservableCollection Users { get; set; }

        public Database(string name)
        {
            Name = name;
            Schemas=new ObservableCollection
                        {
                            new Schema("Schema1"),
                            new Schema("Schema2")
                        };
            Users=new ObservableCollection
                      {
                          new User("User1"),
                          new User("User2")
                      };
        }
    }

    public class Schema:DependencyObject
    {
        public string Name { get; set; }
        public Schema(string name)
        {
            Name = name;   
        }
    }

    public class User:DependencyObject
    {
        public string Name { get; set; }
        public User(string name)
        {
            Name = name;
        }
    }
}