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

Try this

AllSubControls(this).OfType().ToList()
    .ForEach(o => o.TextChanged += C_TextChanged);

where AllSubControls is

private static IEnumerable AllSubControls(Control control)
    => Enumerable.Repeat(control, 1)
       .Union(control.Controls.OfType()
                              .SelectMany(AllSubControls)
             );

LINQ is great!