How can I set different Tooltip text for each item in a listbox?

Question

I have a listbox that is databound to a Collection of objects. The listbox is configured to display an identifier property of each object. I would like to show a tooltip w

Answer 1

You can use this simple code that uses the onMouseMove event of ListBox in WinForms:

private void ListBoxOnMouseMove(object sender, MouseEventArgs mouseEventArgs)
{
        var listbox = sender as ListBox;
        if (listbox == null) return;

        // set tool tip for listbox
        var strTip = string.Empty;
        var index = listbox.IndexFromPoint(mouseEventArgs.Location);

        if ((index >= 0) && (index < listbox.Items.Count))
            strTip = listbox.Items[index].ToString();

        if (_toolTip.GetToolTip(listbox) != strTip)
        {
            _toolTip.SetToolTip(listbox, strTip);
        }
}

Of course you will have to init the ToolTip object in the constructor or some init function:

_toolTip = new ToolTip
{
            AutoPopDelay = 5000,
            InitialDelay = 1000,
            ReshowDelay = 500,
            ShowAlways = true
};

Enjoy!