Catching Unselecting All in ListView — SelectedIndexChanged Firing Twice

Question

Basically, I have a ListView of items. When one is selected, a text box comes into view on the right to display more details of that item (takes a little time for the item

Answer 1

The best solution I've found is to temporarily set an event handler to Application.Idle and do your checking from there, like so:

bool handled;
private void listView1_SelectedIndexChanged(object sender, EventArgs e) {
    if (!handled)
    {   handled = true;
        Application.Idle += SelectionChangeDone;   }
}

private void SelectionChangeDone(object sender, EventArgs e) {
    Application.Idle -= SelectionChangeDone;
    handled = false;

    ListView.SelectedListViewItemCollection collection = this.listView1.SelectedItems;

    if (collection.Count == 0)
        this.label2.Text = "Unselected all!"

    foreach (ListViewItem item in collection)
        getSideInformation(item.Text);
}

It shouldn't matter whether you use ItemSelectionChanged or SelectedIndexChanged. Both will work fine in this case.

Big thanks goes to Grammarian for his answer to essentially the same question here: https://stackoverflow.com/a/26393234/2532220