Exposing events of underlying control

Question

I have a combobox in a custom control. How can I expose specific events from it such as SelectedIndexChanged or KeyPress, etc to anyone/thing implementing my custom control?

Answer 1

You can forward the events like this:

    public event EventHandler SelectedIndexChanged      {         add { inner.SelectedIndexChanged += value; }         remove { inner.SelectedIndexChanged -= value; }     } 

Answer 2

You will need to code these into the control yourself - the user control does not automatically promote the events of its child controls. You can then cross-wire your actual control to the user control's promoted event:

        public event EventHandler SelectedIndexChanged;          private void OnSelectedIndexChanged(object sender, EventArgs e)         {             if (SelectedIndexChanged != null)                 SelectedIndexChanged(sender, e);         }          public UserControl1()         {             InitializeComponent();              cb.SelectedIndexChanged += new EventHandler(OnSelectedIndexChanged);         } 

Unfortunately you will need to do this for every event you are interested in.