TreeView不显示ImageList中的图像

Question

I have a TreeView that displays CheckBox es:

I want to check if a given directory contains an ".mdf" database and if it does, check whether it is attached on the selected server instance. If the database is attached I display an image against that node, and a different image if it is not attached. Note: The images are .png format, size 32x32...

I populate an ImageList from Properties.Resources

mainImageList = new ImageList();
mainImageList.Images.Add(Properties.Resources.Database);
mainImageList.Images.Add(Properties.Resources.DatabaseGrey);

I then loop through the tree and add the relevant image

public static void RecursiveAddImage(TreeNode treeNode, List<string> attachedList)
{
    if (String.Compare(Path.GetExtension(treeNode.Text), ".mdf", true) == 0)
    {
        string databaseName = treeNode.Text.Replace(".mdf", String.Empty);
        if (attachedList.Contains(databaseName))
        {
            treeNode.ImageIndex = 0;
            treeNode.SelectedImageIndex = 0;
        }
        else
        {
            treeNode.ImageIndex = 1;
            treeNode.SelectedImageIndex = 1;
        }
    }
    foreach (TreeNode node in treeNode.Nodes)
        RecursiveAddImage(node, attachedList);
}

The above code goes through the loop with no complaints, finds ".mdf"s and seems to add the relevant ImageIndexes but these do not show up in the TreeView . What am I doing wrong here and can I add the ImageList at design time (something I also can't seem to do)?

I have read several posts and ofcourse the MSDN documantation but I still can't seem to get it working. Any help as always, is much appreciated.

Answer 1

Make sure the TreeView control has the ImageList property set to the correct ImageList reference:

mainImageList = new ImageList();
mainImageList.Images.Add(Properties.Resources.Database);
mainImageList.Images.Add(Properties.Resources.DatabaseGrey);

treeView1.ImageList = mainImageList;

Answer 2

TreeNode.StateImageIndex= 0; would set the imagelist images. Make sure the imagelist is binded to Treeview control as mentioned above.