treeview Multibinding in wpf

Question

I want to bind a treeview to a class like this one:

public class Folder : Base_FileFolder
{
    public Folder()
    {
        Folders = new ObservableCollection<Folder>();
        Files = new ObservableCollection<File>();
    }
    public ObservableCollection<Folder> Folders { get; set; }
    public ObservableCollection<File> Files { get; set; }
}

the other classes ares:

public class File : Base_FileFolder
{
}

public class Base_FileFolder : DependencyObject
{
    public string Name
    {
        get { return (string)GetValue(NameProperty); }
        set { SetValue(NameProperty, value); }
    }
    public static readonly DependencyProperty NameProperty = DependencyProperty.Register("Name", typeof(string), typeof(Base_FileFolder), new UIPropertyMetadata(""));
}

How can I create a treeview that shows Files and Folders collection

I want to use something like this:

 <HierarchicalDataTemplate
 DataType="{x:Type model:Folder}"
 ItemsSource="{Binding Childs}">   
 <DockPanel>
       <Label Content="{Binding Name}"/>    </DockPanel>
 </HierarchicalDataTemplate>

so I get Somethign like this:

rootFolder

|
|-File
|-File
|-Folder
  |-File
  |-File
  |-Folder
    |-File

Answer 1

What exactly is your question? How to combine them? CompositeCollection.

EDIT: as mentioned in the comments, my Intuipic application does something very similar to what you're requesting. Here's a screenshot:

Answer 2

This is quite easy, considering your constellation.

First: Adjust your classes. You do not need two separate Lists for files and folders in the folders class. Just use one IList<Base_FileFolder> inside the Base_FileFolder class (good OOP) and call it Children!

Then you'll need only two more steps:

1. Two HierarchicalDataTemplates

   <HierarchicalDataTemplate DataType="{x:Type FolderNode}"  ItemsSource="{Binding Path=Children}">
       <Grid>
           <TextBlock Text="{Binding FolderName}" />
       </Grid>
   </HierarchicalDataTemplate>
   
   <HierarchicalDataTemplate DataType="{x:Type FileNode}"  ItemsSource="{Binding Path=Children}">
       <Grid>
           <TextBlock Text="{Binding FileName}" />
       </Grid>
   </HierarchicalDataTemplate>
   

2. And a TreeView like this

   <TreeView Name="TreeViewFileTree" ItemsSource="{rootFolder.Children}" />
   

That's it. WPF's strength is its simplicity.

Answer 3

You need to use You'll need 3 things:

1. a HierarchicalDataTemplate, like you have, to do parent+children, and template the folders. you MIGHT be able to use a CompositeCollection here to merge the folders+files, but i'm not sure about that...you might have to add another property to your folder class that returns the union of files and folders and call it "Children" or whatever...
2. A DataTemplate to template files in the tree
3. A TemplateSelector to tell the tree to switch between templates depending on the item in the tree. Instead of setting an ItemTemplate on the tree, set the ItemTemplateSelector to this.