How to filter a wpf treeview hierarchy using an ICollectionView?

Question

I have a hypothetical tree view that contains this data:

RootNode
   Leaf
   vein
SecondRoot
   seeds
   flowers

I am trying to filter the

Answer 1

This is how I filtered the items on my TreeView:

I have the class:

class Node
{
    public string Name { get; set; }
    public List Children { get; set; }

    // this is the magic method!
    public Node Search(Func predicate)
    {
         // if node is a leaf
         if(this.Children == null || this.Children.Count == 0)
         {
             if (predicate(this))
                return this;
             else
                return null;
         }
         else // Otherwise if node is not a leaf
         {
             var results = Children
                               .Select(i => i.Search(predicate))
                               .Where(i => i != null).ToList();

             if (results.Any()){
                var result = (Node)MemberwiseClone();
                result.Items = results;
                return result;
             }
             return null;
         }             
    }
}

Then I could filter results as:

// initialize Node root
// pretend root has some children and those children have more children
// then filter the results as:
var newRootNode = root.Search(x=>x.Name == "Foo");