Question

I have this code:

    public void AddNode(string Node)
    {
        try
        {
            treeView.Nodes.Add(Node);
            treeView.Refresh();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
    }

Very simple as you see, this method gets file path. like C:\Windows\notepad.exe

Now i want the TreeView to show it like FileSystem..

-C:\
    +Windows

And if i click the ‘+’ it gets like this:

-C:\
    -Windows
       notepad.exe

Here is what i get now from sending theses pathes to the method above:

How can i do that it will arrange the nodes?

Answer 1

If I were you, I would split the input string onto substrings, using the string.Split method and then search for the right node to insert the relevant part of a node. I mean, that before adding a node, you should check whether node C:\ and its child node (Windows) exist.

Here is my code:

...
            AddString(@"C:\Windows\Notepad.exe");
            AddString(@"C:\Windows\TestFolder\test.exe");
            AddString(@"C:\Program Files");
            AddString(@"C:\Program Files\Microsoft");
            AddString(@"C:\test.exe");
...

        private void AddString(string name) {
            string[] names = name.Split(new char[] { '\\' }, StringSplitOptions.RemoveEmptyEntries);
            TreeNode node = null;
            for(int i = 0; i < names.Length; i++) {
                TreeNodeCollection nodes = node == null? treeView1.Nodes: node.Nodes;
                node = FindNode(nodes, names[i]);
                if(node == null)
                    node = nodes.Add(names[i]);
            }
        }

        private TreeNode FindNode(TreeNodeCollection nodes, string p) {
            for(int i = 0; i < nodes.Count; i++)
                if(nodes[i].Text.ToLower(CultureInfo.CurrentCulture) == p.ToLower(CultureInfo.CurrentCulture))
                    return nodes[i];
            return null;
        }