How to select a node of treeview programmatically in c#?

Question

Used treeview.SelectedNode to select a child node. How to invoke treeview.AfterSelect event when a node is selected programmatically?

this.treeView1.SelectedNode = this.treeView1.Nodes[0].Nodes[0].Nodes[0].Nodes[0]; 
if (this.treeView1.Nodes[0].Nodes[0].Nodes[0].Nodes[0].IsSelected) 
{
 MessageBox.Show("Node is selected"); 
}

Rennes

You'll find an example here. – Bowes

It didnt work in my case..... – Rennes

AfterSelect fires whether you select the node in code or the user does it. Post better repro code. – Huffish

Answer 1

Apologies for my previously mixed up answer.

Here is how to do:

myTreeView.SelectedNode = myTreeNode;

---

(Update)

I have tested the code below and it works:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        treeView1.Nodes.Add("1", "1");
        treeView1.Nodes.Add("2", "2");
        treeView1.Nodes[0].Nodes.Add("1-1", "1-1");
        TreeNode treeNode = treeView1.Nodes[0].Nodes.Add("1-2", "1-3");
        treeView1.SelectedNode = treeNode;
        MessageBox.Show(treeNode.IsSelected.ToString());
    }


}

Mohock

I have tried selecting a node aas you said but it is returning as false when I called isSelected() of that node after it was selected.. – Rennes

Iam adding nodes and selecting them in the constructor so failed to invoke afterselect event. Got my mistake.. Thanks a lot – Rennes

Yes, constructor is not quite the same as Form Load. – Mohock

Something I learned was that when you select the node programatically and it doesn't appear selected (blue) it's possible due to the treeview not being the active control. – Lapith

Thank you - following the SelectedNode setter with a call to treeView1.Focus() makes this work great – Chud

Answer 2

treeViewMain.SelectedNode = treeViewMain.Nodes.Find(searchNode, true)[0];

where searchNode is the name of the node. I'm personally using a combo "Node + Panel" where Node name is Node + and the same tag is also set on panel of choice. With this command + scan of panels by tag i'm usually able to work a treeview+panel full menu set.

Subirrigate

Welcome to stackoverflow. Because this question already have several answers, consider adding details to your answer as to why your answer and not one of the existing ones. – Noddle

Answer 3

Call the TreeView.OnAfterSelect() protected method after you programatically select the node.

Scutage

Maybe you meant "hook to AfterSelect event..." – Contemn

Answer 4

yourNode.Toggle(); //use that function on your node, it toggles it

Romp

Answer 5

I had the same problem right now and managed it this way.

TreeNodeCollection nodes = treeView1.Nodes;
foreach (TreeNode node in nodes)
{
    if(node.Text == "My Nodename")
    {
        treeView1.SelectedNode = node;
        treeView1.Select();
        break;
    }
}

Hope that helps someone.

Ringmaster

Answer 6

TreeViewItem tempItem = new TreeViewItem();
TreeViewItem tempItem1 = new TreeViewItem(); 
tempItem =  (TreeViewItem) treeView1.Items.GetItemAt(0);    // Selecting the first of the top level nodes
tempItem1 = (TreeViewItem)tempItem.Items.GetItemAt(0);      // Selecting the first child of the first first level node
SelectedCategoryHeaderString = tempItem.Header.ToString();  // gets the header for the first top level node
SelectedCategoryHeaderString = tempItem1.Header.ToString(); // gets the header for the first child node of the first top level node
tempItem.IsExpanded = true;         //  will expand the first node

Bate

Answer 7

private void btn_CollapseAllAndExpandFirstLevelUnderRoot(object sender, EventArgs e)

{
    //this example collapses everything, then expands the first level under the root node.

    tv_myTreeView.CollapseAll();
    TreeNode tn =  tv_myTreeView.Nodes[0];
    tn.Expand();
}

Daphne