C# – How to avoid winforms treeview icon changes when item selected

ctreeviewwinforms

I'm experimenting with a treeview in a little C#/Winforms application. I have programatically assigned an ImageList to the treeview, and all nodes show their icons just fine, but when I click a node, its icon changes (to the very first image in the ImageList). How can I get the icon to remain unchanged?

BTW: The "SelectedImageIndex" is set to "(none)", since I don't really know what to set it to, since the image-index is different for the nodes (i guess?).

UPDATE: Here is the code of the application (I'm using Visual Studio Express 2008):

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            treeView1.BeginUpdate();
            treeView1.Nodes.Clear();
            treeView1.Nodes.Add("root","Project", 0);  

            treeView1.Nodes[0].Nodes.Add("Foo", "Foo", 2);
            treeView1.Nodes[0].Nodes[0].Nodes.Add("Fizz", "Fizz", 3);
            treeView1.Nodes[0].Nodes[0].Nodes.Add("Buzz", "Buzz", 3);

            treeView1.Nodes[0].Nodes.Add("Bar", "Bar", 1);
            treeView1.Nodes[0].Nodes[1].Nodes.Add("Fizz", "Fizz", 2);
            treeView1.Nodes[0].Nodes[1].Nodes[0].Nodes.Add("Buzz", "Buzz", 3);

            treeView1.EndUpdate();
            treeView1.ImageList = imageList1;
        }
    }
}

Best Answer

Simply set the SelectedImageIndex for each node to the same value as ImageIndex. So, if you're creating your node programatically:

        TreeNode node = new TreeNode("My Node");
        node.ImageIndex = 1;
        node.SelectedImageIndex = 1;

Or you can specify the whole lot in the constructor:

        TreeNode node = new TreeNode("My Node", 1, 1);

You can do the same thing using the design time editor if you're adding nodes at design time. You just need to set the SelectedImageIndex at the node level and not at the TreeView level.

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