Question

I am trying to bind a object collection to a Telerik TreeView control. My object structure would somehow look like:

Item 1.1
   - Item 1.1.1
       - Item 1.2.1
       - Item 1.2.2
   - Item 1.1.2
...
Item n.1
   - Item n.1.1
      - Item n.2.1
        - Item n.3.1

All these object have a common bool property, i.e. isBindable. I want to bind this collection to my TreeView control, but the control should only bind the object if its property isBindable = true.

I don’t want to loop through the whole collection and remove one-by-one based on isBindable before doing an ItemSource to the control.

Any better idea how can I achieve that, maybe with LINQ?

Thanks,
Bhaskar

Answer 1

You can try to achieve this using recursion. You would need a single foreach loop though. Please see the below method. Just pass your collection to this method and see if it gets filtered.

private List<Item> Filter(List<Item> itemList)
        {

            List<Item> filteredItems = (from c in itemList
                                        where c.IsBindable == true
                                        select c).ToList();
            foreach (Item item in filteredItems)
            {
                if (item.Item != null)
                    item.Item = Filter(item.Item);
            }

            return filteredItems;
        }

class Item
    {
        public List<Item> Item { get; set; }
        public bool IsBindable { get; set; }

        public Item()
        {
            IsBindable = false;
        }

    }