CODEWITHSUNDEEP
c#winformstreeview
AndroidAL
AndroidAL

Reputation: 1119

Using a Treeview to display information

I have a treeview which has a list of countries, i also have a textbox with a description about each country how can i change the text in the description depending on which node is clicked.

Upvotes: 0

Views: 213

Answers (1)

René Vogt
René Vogt

Reputation: 43886

You can subscribe to the AfterSelect event of your TreeView:

public partial class Form1
{
    private TreeView treeView1;
    private TextBox textBox1;
    // ... shortened example

    public Form1()
    {
        InitializeComponent();
        treeView1.AfterSelect += treeView1_AfterSelect;
        //...
    }

    private void TreeView1_AfterSelect(object sender, TreeViewEventArgs e)
    {
        string description = string.Empty;
        TreeNode node = treeView1.SelectedNode;
        if (node != null)
            description = // determine the text from your country data

        textBox1.Text = description;
    }
}

I normally set the Tag property of the TreeNode to the corresponding model instance. So if you have a Country class as this:

public class Country
{
    public string Name { get; set; }
    public string Description { get; set; }
}

I'd add TreeNodes like this:

Country country = new Country { Name = "SomeCountry", Description = "description" };
TreeNode nextNode = new TreeNode(country.Name);
nextNode.Tag = country;
parentNode.Nodes.Add(nextNode);

And your AfterSelect handler could look like this:

    private void TreeView1_AfterSelect(object sender, TreeViewEventArgs e)
    {
        textBox1.Text = (treeView1.SelectedNode?.Tag as Country)?.Description ?? string.Empty;
    }

Upvotes: 1

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