I have TreeNode-derived objects (MyTreeNode) that I store in a TreeView.
Before I add new nodes, I want to make sure a node with the same identity
(Text property) isn't already there. So, I overrode Object.Equals in a
MyTreeNode class like so:

public class MyTreeNode : TreeNode
{
...
public override bool Equals(object obj)
{
return true; //TODO: compare Text property instead
}
}


Obviously, that's not all it should do, but the problem is this method never
even gets called!
I add the new node like so:


MyTreeNode node = new MyTreeNode("testing");
if(!tvMyTreeView.Nodes.Contains(node))
tvMyTreeView.Nodes.Add(node);


What am I doing wrong?!

Ouch - that's interesting, considering the docs say that CollectionBase uses
Equals to implement IList.Contains. I wonder why TreeNodeCollection doesn't
implement IList.Contains the same way.

Thanks for the help!

-Joel

"Mattias Sjögren" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Joel,
>
> >What am I doing wrong?!
>
> Nothing. But it looks like the implementation of
> TreeNodeCollection.Contains() only checks for reference equality, it
> never calls Equals(). I guess you have to maintain a separate list of
> nodes and check that one instead to avoid duplicates.
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/
> Please reply only to the newsgroup.