CODEWITHSUNDEEP
c#winformstreeview
Developer
Developer

Reputation: 8646

How to check whether treeview root node has child nodes exists or not

I have a treeview with a root node initially as Root. If i right click on Root node i will have a context menu displayed with some options as New and other if i select New i will add a child node to the Root node. If i again Right click on the Root node and if the Root has child nodes i would like to clear all child nodes and add a new child node how can i do this

Upvotes: 5

Views: 27769

Answers (6)

estinamir
estinamir

Reputation: 503

You can also try the opposite, i.e. check if current node has a parent. 

if(treeView1.SelectedNode.Parent == null) {} //parent
else{} //child

Upvotes: 0

Tarun Bhardwaj
Tarun Bhardwaj

Reputation: 1

                foreach (TreeNode node in treeview.Nodes)
                     {

                        if (node.ChildNodes.Count != 0)
                        {

                           //Node exists

                        }
                        else
                        {

                          //Node doesn't exists

                        }
                    }

Upvotes: -1

Rob Lowther
Rob Lowther

Reputation: 371

In the 'right click' handler, assuming you use Mouse Click, you can use the event args TreeNodeMouseClickEventArgs to get the current node ...

void tv_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
    {
      if (e.Button == MouseButtons.Right)
      {
        TreeNode selectedNode = e.Node;
      }
    }

Upvotes: 0

Developer
Developer

Reputation: 8646

After all the final answer is as follows

    if (tvwACH.HitTest(location).Node.Nodes.Count > 0 && tvwACH.SelectedNode.Parent == null )
        {
            foreach (TreeNode node in tvwACH.Nodes)
            {
                node.Nodes.Clear();
            }
    }

Upvotes: 1

fedotoves
fedotoves

Reputation: 767

You can check TreeNode.Nodes property. If count is greater than zero then you have child nodes, otherwise not

Upvotes: 0

Hans Olsson
Hans Olsson

Reputation: 55059

TreeNode.Nodes gives you a list of all child nodes to the node you're looking at.

You can then call Clear on that collection to delete all childnodes.

Upvotes: 6

Related Questions