Hi,

how can I add control such as Button to TreeView.

Actually I have tried this through

TreeView.Controls.Add( Control child) method but it gives exception that TreeView  does not allow child control.

Hi,

The default TreeView control in ASP.NET can only render text, icons and checkboxes.

Is there absolutely no way to have a treeview contain radio buttons? For instance, I am trying to do something like this:

• Option 1
  
• Option 2
  
• Option 3
  

           [ ] Sub Option 1
           [ ] Sub Option 2
           [ ] Sub Option 3

 
I would like to make it such that the Sub Options behave like Children in a treeview, where they only show up once the Option 3 is selected. Otherwise, Options 1, 2 and 3 act like radio buttons, being mutually exclusive.
 

Hi,

You can do it, however I think you need custom it yourself, either writing a custom TreeView control or rendering it yourself. But I think it might be quite complex according to your requirement.

 Rather then creating a Button I'd like to have an ImageButton. But TreeNode does not inherit from WebControl, so I don't know how to retrieve the ImageUrl from an image located in the dll as resource.

Something like

button.ImageUrl = this.Page.ClientScript.GetWebResourceUrl(typeof(WebCustomControl1), "MyCompany.Web.Resources.edit.gif"); 

is not possible. Any suggestions? thx a lot

With the solution below you got to use CommandTreeView instead of TreeView as the control on the page. 

 public class CommandTreeView : TreeView
    {
        protected override TreeNode CreateNode()
        {
            //return base.CreateNode();
            return new CommandTreeNode();
        }
}

namespace MyCompany.Web.UI
{
    [Flags]
    public enum CommandButtonSet
    {
        None = 0,

        Edit = 1,

        Delete = 2,

        MoveUp = 4,

        MoveDown = 8
    }

    public class CommandTreeNode : TreeNode
    {

        private CommandButtonSet _commandButtonSet = CommandButtonSet.None;

        private List _buttons = new List();

        public CommandTreeNode()
        {

        }

        public CommandTreeNode(String text, String value)
            : base(text, value)
        {

        }

        public CommandButtonSet CommandButtonSet
        {
            get { return _commandButtonSet; }
            set { _commandButtonSet = value; }
        }

        protected override void RenderPreText(System.Web.UI.HtmlTextWriter writer)
        {
            base.RenderPreText(writer);

            if ( (CommandButtonSet & CommandButtonSet.Edit) == CommandButtonSet.Edit )
                _buttons.Add(GetButton("edit", Value, "edit.gif", "Edit"));

            if ( (CommandButtonSet & CommandButtonSet.Delete) == CommandButtonSet.Delete )
                _buttons.Add(GetButton("delete", Value, "delete.gif", "Delete"));

            if ( (CommandButtonSet & CommandButtonSet.MoveDown) == CommandButtonSet.MoveDown )
                _buttons.Add(GetButton("moveUp", Value, "moveUp.gif", "Move Up"));

            if ( (CommandButtonSet & CommandButtonSet.MoveUp) == CommandButtonSet.MoveUp )
                _buttons.Add(GetButton("moveDown", Value, "moveDown.gif", "Move Down"));

            foreach ( WebControl control in _buttons )
            {
                control.RenderControl(writer);
                writer.Write(" ");
            }

        }

        private WebControl GetButton(string commandName, string commandArgument, string img, string alternateText)
        {
            Button button = new Button();
            button.CommandName = commandName;
            button.CommandArgument = commandArgument;
            button.Text = alternateText;
            return button;
        }

        protected override object SaveViewState()
        {
            Object[] state = new Object[2];
            state[0] = base.SaveViewState();
            state[1] = CommandButtonSet;
            return state;
        }

        protected override void LoadViewState(object state)
        {
            if ( state != null )
            {
                Object[] savedState = (Object[])state;
                CommandButtonSet = (CommandButtonSet)savedState[1];
                base.LoadViewState(savedState[0]);
            }
        }
    }
}