TreeView

The TreeView is a control that presents hierarchical tree data and allows selection of it.
One example for populating a TreeView can be from a directory on the computer. You can create a TreeView in the MainWindow.axaml file in an Avalonia MVVM project.
<TreeView Items="{Binding Items}" 
	  Width="400" Height="480" 
	  HorizontalAlignment="Left">
	<TreeView.ItemTemplate>
		<TreeDataTemplate ItemsSource="{Binding Subfolders}">
			<TextBlock Text="{Binding strNodeText}"/>
		</TreeDataTemplate>
	</TreeView.ItemTemplate>
</TreeView>
In the MainWindowViewModel.cs you can add this code which will recursively look up all the subfolders and populate the TreeView from Items and Subfolders
public ObservableCollection<Node> Items { get; }
public ObservableCollection<Node> SelectedItems { get; }
public string strFolder { get; set; }
​
public MainWindowViewModel()
{
    strFolder = @"C:\Users\hooty\Desktop"; // EDIT THIS FOR AN EXISTING FOLDER
​
    Items = new ObservableCollection<Node>();
​
    Node rootNode = new Node(strFolder);
    rootNode.Subfolders = GetSubfolders(strFolder);
    
    Items.Add(rootNode);
}
​
public ObservableCollection<Node> GetSubfolders(string strPath)
{
    ObservableCollection<Node> subfolders = new ObservableCollection<Node>();
    string[] subdirs = Directory.GetDirectories(strPath, "*", SearchOption.TopDirectoryOnly);
​
    foreach (string dir in subdirs)
    {
        Node thisnode = new Node(dir);
​
        if (Directory.GetDirectories(dir, "*", SearchOption.TopDirectoryOnly).Length > 0)
        {
            thisnode.Subfolders = new ObservableCollection<Node>();
​
            thisnode.Subfolders = GetSubfolders(dir);
        }
​
        subfolders.Add(thisnode);
    }
​
    return subfolders;
}
​
public class Node
{
    public ObservableCollection<Node> Subfolders { get; set; }
​
    public string strNodeText { get; }
    public string strFullPath { get; }
​
    public Node(string _strFullPath)
    {
        strFullPath = _strFullPath;
        strNodeText = Path.GetFileName(_strFullPath);
    }
}
The example project source can be found at avalonia-treeview-test​
Reference
​TreeView​
Source code
​TreeView.cs​

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