CODEWITHSUNDEEP
c#winformstreeview
M_Mogharrabi
M_Mogharrabi

Reputation: 1389

How can I find a root node in TreeView

I have a TreeView in my Windows application. Tn this TreeView, the user can add some root nodes and also some sub nodes for these root nodes and also some sub nodes for these sub nodes and so on ...

For example:

Root1
     A
       B
         C
         D
          E  
Root2
     F
      G
.
.
.

Now my question is that if I am at node 'E' what is the best way to find its first root node ('Root1')?

Upvotes: 7

Views: 17005

Answers (2)

Eldar Value
Eldar Value

Reputation: 181

public TreeNode RootTreeNode(TreeNode n) { while (n.Level > 0) { n = n.Parent; } return n; }

Example to get root treenode:

private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
{
    var node = (e == null ? ((System.Windows.Forms.TreeView)sender).SelectedNode : e.Node);
    var rootNode = RootTreeNode(node);
}

Enjoy

Upvotes: 0

Fischermaen
Fischermaen

Reputation: 12468

Here is a little method for you:

private TreeNode FindRootNode(TreeNode treeNode)
{
    while (treeNode.Parent != null)
    {
        treeNode = treeNode.Parent;
    }
    return treeNode;
}

you can call in your code like this:

var rootNode = FindRootNode(currentTreeNode);

Upvotes: 13

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