Bind treeview with combobox C#

Question

1.00/5 (1 vote)

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i have Treeview with
Node
-Node1
-Node1Child
-Node2
-Node2Child

and ComboBox with data
Combo1
Combo2

how to make it work if Node1Child Clicked then in ComboBox Show Node1Child and can be changed woth Combo2 value?

What I have tried:

i search everywhere and cannot find solution for C#

Posted 19-Feb-17 10:56am

Member 12230809

Updated 19-Feb-17 13:31pm

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Graeme_Grant 19-Feb-17 18:28pm

Winform, Wpf, UWP? What have you tried so far? Share your code.

Member 12230809 19-Feb-17 18:41pm

winform

 
            // 
            // treeView1
            // 
            this.treeView1.Location = new System.Drawing.Point(121, 24);
            this.treeView1.Name = "treeView1";
            treeNode1.Name = "Node2";
            treeNode1.Text = "Node2";
            treeNode2.Name = "Node1";
            treeNode2.Text = "Node1";
            treeNode3.Name = "Node1";
            treeNode3.Text = "Node1";
            treeNode4.Name = "Node0";
            treeNode4.Text = "List of Node";
            this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
            treeNode4});
            this.treeView1.Size = new System.Drawing.Size(147, 215);
            this.treeView1.TabIndex = 2;
            this.treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect);
            // 
            // comboBox1
            // 
            this.comboBox1.FormattingEnabled = true;
            this.comboBox1.Items.AddRange(new object[] {
            "list_c1",
            "list_c2",
            "list_c3"});
            this.comboBox1.Location = new System.Drawing.Point(5, 123);
            this.comboBox1.Name = "comboBox1";
            this.comboBox1.Size = new System.Drawing.Size(110, 21);
            this.comboBox1.TabIndex = 3;
            this.comboBox1.SelectedIndexChanged += new System.EventHandler(this.comboBox1_SelectedIndexChanged);

im add treeview data from text file
if (data1 == "1000") treeView1.Nodes[0].Nodes[0].Nodes[0].Text = "Banana";
im trying to make treeview node can be changed with comboBox

Graeme_Grant 19-Feb-17 18:58pm

You have bound to the events, where is the code for the event handlers?

Member 12230809 19-Feb-17 19:05pm

 
        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            var nodes = treeView1.Nodes;
            comboBox1.DisplayMember = "Text";
            comboBox1.DataSource = nodes;
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            var node = comboBox1.SelectedItem as TreeNode;
            if (node == null)
                return;

            treeView1.SelectedNode = node;
        }

that code only get root node. and Combobox only show root node text not any other comboBox value

Graeme_Grant 19-Feb-17 19:41pm

What do you want the ComboBox to have to select from?

[Edit:] A TreeView has a Hierarchical data structure. So your code is only working with the first layer - ie: Root layer.

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Graeme_Grant · Accepted Answer · 2017-02-19T13:02:00

The AfterSelect() event only fires for new selections and won't fire if already selected. You may want to capture the TreeView's Click event instead.

C#

private void treeView1_Click(object sender, EventArgs e)
 {
   TreeViewHitTestInfo info = treeView1.HitTest(treeView1.PointToClient(Cursor.Position));
   if (info != null)
     MessageBox.Show(info.Node.Text);
 }

Edit:

Here is what I think that you are attempting to do:

C#

private void treeView1_Click(object sender, EventArgs e)
{
    TreeViewHitTestInfo info = treeView1.HitTest(treeView1.PointToClient(Cursor.Position));
    if (info != null)
    {
        comboBox1.DisplayMember = "Text";
        comboBox1.DataSource = info.Node.Nodes;
    }
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    var node = comboBox1.SelectedItem as TreeNode;
    if (node == null)
        return;
    treeView1.SelectedNode = node;
    treeView1.Focus();
}