how to bind to a recursive object?

[Bruce]

I would like to be able to use a BindlingList of Node as a datasource for the treeview, but I'm unsure of how to set up the properties, Children in Node will contain Children, and so forth.   

class Node
{
  public string Title; //DisplayMember
  public string Value; //ValueMember
  public bool IsActive; //CheckedMember
  public List<Node> Children = new List<Node>(); //Children of this node here

  public Node()
  {

  }

  public Node(string title, string value, bool isActive, List<Node> children)
  {
    Title = title;
    Value = value;
    IsActive = isActive;
    Children = children;
  }
}

[Dess | Tech Support Engineer, Principal]

Hello Bruce, 

Thank you for writing.  

Here is a sample code snippet demonstrating how to bind RadTreeView to recursive data:

public partial class RadForm1 : Telerik.WinControls.UI.RadForm
{
    public RadForm1()
    {
        InitializeComponent();
        List<DBTTreeItem> treeSource = new List<DBTTreeItem>();

        for (int i = 0; i < 5; i++)//first level
        {
            List<DBTTreeItem> children = new List<DBTTreeItem>();
            treeSource.Add(new DBTTreeItem(i, "Description" + i, children));
            for (int j = 5; j < 10; j++)//second level
            {
                List<DBTTreeItem> subChildren = new List<DBTTreeItem>();
                children.Add(new DBTTreeItem(i * 10 + j, "Child description" + (i * 10 + j), subChildren));
                if (j % 2 == 0)
                {
                    for (int k = 10; k < 15; k++)//third level
                    {
                        subChildren.Add(new DBTTreeItem(i + j + k, "Sub child description" + (i + j + k), new List<DBTTreeItem>()));
                    }
                }
            }
        }

        radTreeView1.DataSource = treeSource;
        radTreeView1.DisplayMember = "Description\\Description\\Description";
        radTreeView1.ChildMember = "Children\\Children\\Children";
    }

    public void AdjustMemberMapping()
    {
        List<DBTTreeItem> treeSource = radTreeView1.DataSource as List<DBTTreeItem>;
        StringBuilder desc = new StringBuilder();
        StringBuilder child = new StringBuilder();
        int depth = 4;
        treeSource[0].Children[1].Children[0].Children.Add(new DBTTreeItem(123, "New added" + 123, new List<DBTTreeItem>()));

        for (int i = 0; i < depth; i++)
        {
            if (desc.Length > 0)
            {
                desc.Append('\\');
                child.Append('\\');
            }
            desc.Append("Description");
            child.Append("Children");
        }

        radTreeView1.DataSource = treeSource;
        radTreeView1.DisplayMember = desc.ToString();
        radTreeView1.ChildMember = child.ToString();
    }

    private void radButton1_Click(object sender, EventArgs e)
    {
        AdjustMemberMapping();
    }
}

public class DBTTreeItem
{
    public int ID { get; set; }

    public string Description { get; set; }

    public List<DBTTreeItem> Children { get; set; }

    public DBTTreeItem(int iD, string description, List<DBTTreeItem> children)
    {
        this.ID = iD;
        this.Description = description;
        this.Children = children;
    }
}

I hope this information helps. Should you have further questions I would be glad to help.

Regards,
Dess
Progress Telerik

[Bruce]

Thanks this helps a lot.