I cannot figure out how to add a child node to a treeview

Question

Here's my code:

public Form1()
{
    InitializeComponent();
    treeView1.Nodes.Add(new TreeNode("Graphic Requests"));
    if (TreeNodesList == null) TreeNodesList = new List<TreeNode>();
    TreeNodesList.Add(new TreeNode("Art Not Started"));
    TreeNodesList.Add(new TreeNode("Art In Progress"));
    TreeNodesList.Add(new TreeNode("Items To Accept/Modify"));
    TreeNodesList.Add(new TreeNode("Final Art Not Locked"));

    foreach (var node in TreeNodesList)
    {
        treeView1.Nodes.Add(node);
    }
}

I was expecting to have a parent node, "Graphic Requests", with the remaining nodes added as children. However, my list looks like this:

Resulting list

Can someone tell me what I'm missing?

score 2 · Accepted Answer · answered Mar 12 '14 at 14:49

2

You're adding the nodes to treeView1 that's why they are being parent nodes instead of children. Rather add them to the first node that you added.

Try this:

public Form1()
{
   InitializeComponent();
   var parent = new TreeNode("Graphic Requests");

   TreeNodesList.Add(new TreeNode("Art Not Started"));
   TreeNodesList.Add(new TreeNode("Art In Progress"));
   TreeNodesList.Add(new TreeNode("Items To Accept/Modify"));
   TreeNodesList.Add(new TreeNode("Final Art Not Locked"));

   foreach (var node in TreeNodesList)
   {
       parent.Nodes.Add(node);
   }
   treeView1.Nodes.Add(parent);
}

answered Mar 12 '14 at 14:49

Dumisani

2,988
1
29
40

Ack! I was adding the nodes to the treeview itself, not the parent node in the treeview. Thanks so much! I'll mark the answer as soon as the timer is up. – Kevin Mar 12 '14 at 14:55
1

You're welcome. It's the simple things that we miss ;) – Dumisani Mar 12 '14 at 14:59

score 1 · Answer 2 · answered Mar 12 '14 at 14:49

You need to add the sub-nodes to the parent-node's Node-collection, or else they are not child nodes, but rather siblings to the parent node.

public Form1()
{
    InitializeComponent();

    var parentNode = new TreeNode("Graphic Requests");

    if (TreeNodesList == null) TreeNodesList = new List<TreeNode>();
    TreeNodesList.Add(new TreeNode("Art Not Started"));
    TreeNodesList.Add(new TreeNode("Art In Progress"));
    TreeNodesList.Add(new TreeNode("Items To Accept/Modify"));
    TreeNodesList.Add(new TreeNode("Final Art Not Locked"));

    foreach (var node in TreeNodesList)
    {
        parentNode.Nodes.Add(node);
    }
    treeView1.Nodes.Add(parentNode);
}

Yair Nevet · Answer 3 · 2014-03-12T17:38:01.367

You first need to add the root node to the tree and only later to add the child nodes:

treeView1.Nodes.Add(new TreeNode("Graphic Requests")); // ROOT NODE

TreeNode parentNode = treeView2.Nodes[0];
if (parentNode != null)
{
  parentNode.Add(new TreeNode("Art Not Started"));
  parentNode.Add(new TreeNode("Art In Progress"));
  parentNode.Add(new TreeNode("Items To Accept/Modify"));
  parentNode.Add(new TreeNode("Final Art Not Locked"));
}

score 1 · Answer 4 · answered Mar 12 '14 at 14:54

You're in fact adding all your nodes to treeview directly. Should add your child nodes to "Graphic" that is your parent node, and then your parent node to your treeview. Try this:

public Form1()
{
    InitializeComponent();
    TreeNode parent = new TreeNode("Graphic Requests")
    if (TreeNodesList == null) TreeNodesList = new List<TreeNode>();
    TreeNodesList.Add(new TreeNode("Art Not Started"));
    TreeNodesList.Add(new TreeNode("Art In Progress"));
    TreeNodesList.Add(new TreeNode("Items To Accept/Modify"));
    TreeNodesList.Add(new TreeNode("Final Art Not Locked"));

    foreach (var node in TreeNodesList)
    {
        parent.Nodes.Add(node);
    }
    treeView1.Nodes.Add(parent);
}

score 0 · Answer 5 · edited May 23 '17 at 11:57

0

You have to do something like this to append to the parent :

foreach (var node in TreeNodesList)
{
    treeView1.Nodes[0].Nodes.Add(node);
}

If you want to find more information about filling the TreeView I recommend you the following article

edited May 23 '17 at 11:57

Community

1
1

answered Mar 12 '14 at 14:50

Victor Sigler

23,243
14
88
105

I cannot figure out how to add a child node to a treeview

5 Answers5