Loop through all controls of a Form, even those in GroupBoxes

Question

I\'d like to add an event to all TextBoxes on my Form:

foreach (Control C in this.Controls)
{
    if (C.GetType() == typeof(System.Windows.Forms         


        

Answer 1

Haven't seen anyone using linq and/or yield so here goes:

public static class UtilitiesX {

    public static IEnumerable GetEntireControlsTree(this Control rootControl)
    {
        yield return rootControl;
        foreach (var childControl in rootControl.Controls.Cast().SelectMany(x => x.GetEntireControlsTree()))
        {
            yield return childControl;
        }
    }

    public static void ForEach(this IEnumerable en, Action action)
    {
        foreach (var obj in en) action(obj);
    }
}

You may then use it to your heart's desire:

someControl.GetEntireControlsTree().OfType().ForEach(x => x.Click += someHandler);