Question

Ok, I have a treeview which I am using to display a number of nodes. I wish to attach data (three textbox fields) to each node but I do not want to show it in the tree. I wish to save the data to a string[] Array if possible. I want the data in the boxes to save to the Arrays when I click on a new node in the tree and pull the information from the Arrays for the new node.

For some reason the code I have does not work. It doesn’t save the information and sometimes it just shows random data in the text boxes as I click about. The code is:

    These are global variables within the form:
    string[] desc1;
    string[] desc2;
    string[] desc3;

 private void treeView1_BeforeSelect(object sender, TreeViewEventArgs e)
    {

          // save the entered text into the local variables
        desc1[treeView1.SelectedNode.Index] = textBox4.Text;
        desc2[treeView1.SelectedNode.Index] = textBox5.Text;
        desc3[treeView1.SelectedNode.Index] = textBox6.Text;

    }

    private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
    {

        // update labels
        label23.Text = treeView1.SelectedNode.Text.ToString();
        label24.Text = (treeView1.SelectedNode.Index + 1).ToString();

        // enable all textbox fields
        textBox4.Enabled = true;
        textBox5.Enabled = true;
        textBox6.Enabled = true;

        // clear all textbox fields
        textBox4.Text = null;
        textBox5.Text = null;
        textBox6.Text = null;



        // if parent is selected then show as unselected - if not update text fields
        if (treeView1.SelectedNode.Text.ToString() == "Parent Name")
        {
            label23.Text = "Unselected";
            label24.Text = "Unselected";
            textBox4.Enabled = false;
            textBox5.Enabled = false;
            textBox6.Enabled = false;
        }
        else
        {
            // show the information from the array in the text fields
            textBox4.Text = desc1[treeView1.SelectedNode.Index];
            textBox5.Text = desc2[treeView1.SelectedNode.Index];
            textBox6.Text = desc3[treeView1.SelectedNode.Index];
        }

    }

Anyone have an idea of what I can do? I have trawled google now for 24hours with no luck.
Thanks!

Answer 1

The TreeNodes have a Tag property that you can use to attach any sort of data that you would like.

You would use it like this:

// To set the data:
myTreeNode.Tag = new string[] { "1", "2", "3" };

// To read the data:
var data = myTreeNod.Tag as string[];