How do I get at the listbox item's “key” in c# winforms app?

Question

I am writing a winforms app in which a user selects an item from a listbox and edits some data that forms part of an associated object. The edits are then applied from the o

Answer 1

Using both the SelectedIndexChanged and SelectedValueChanged didn't work for me - the ListBox's SelectedValue property was always null. This surprised me, too.

As a lame workaround, you could just pull the object out of the ListBox directly, using the SelectedIndex:

public Form1()
{
    InitializeComponent();

    this.listBox1.DisplayMember = "Name";
    this.listBox1.ValueMember = "ID";

    this.listBox1.Items.Add(new Test(1, "A"));
    this.listBox1.Items.Add(new Test(2, "B"));
    this.listBox1.Items.Add(new Test(3, "C"));
    this.listBox1.Items.Add(new Test(4, "D"));
    this.listBox1.Items.Add(new Test(5, "E"));
}

private void OnSelectedIndexChanged(object sender, EventArgs e)
{
    if(-1 != this.listBox1.SelectedIndex)
    {
        Test t = this.listBox1.Items[this.listBox1.SelectedIndex] as Test;
        if(null != t)
        {
            this.textBox1.Text = t.Name;
        }
    }
}

(Test is just a simple class with two properties - ID and Name).

It seems like there should be a better way, but if nothing else this should work.