Question

I have a TreeView windows forms control with an ImageList, and I want some of the nodes to display images, but the others to not have images.

I don’t want a blank space where the image should be. I don’t want an image that looks like the lines that the TreeView would draw if it didn’t have an ImageList. How do I get it to draw images for some items and not others, without resorting to clumsy hacks like that?

Answer 1

I tried this once and I don’t think it is possible.

If you try to set both ImageKey and ImageIndex to ‘not set’ values the control just defaults ImageIndex to 0. The following code:

treeView.ImageKey = 'Value'; Debug.WriteLine(treeView.ImageIndex); treeView.ImageKey = null; Debug.WriteLine(treeView.ImageIndex); treeView.ImageIndex = -1; Debug.WriteLine(treeView.ImageIndex); 

Produces output:

-1 0 0 

This kind of tells you that the control developers wanted to make sure that there was always a default image. That just leaves you with the hack options I’m afraid.