C#

List<T> GetChildren<T>(Control root) {
 List<T> r = new List<T>
 AddChildrenToList(root, r);
 return r;
}

void AddChildrenToList<T>(Control root, List<T> list) {
 foreach(Control c in root.Controls){
  if(c is T) list.Add((T)c);
  AddChildrenToList(c);
 }
}

// use like
GetChildren<Button>(Form1.ActiveForm).ForEach(b => b.BackColor = Color.Yellow);

scanner(Control parent)
{
    foreach (Control c in parent.Controls)
    {
        if (c == c as Label)
        {
            c.ForeColor = Color.Aqua;
        }
        if (c == c as Button)
        {
            c.BackColor = Color.Yellow;
        }
        if (c == c as some_grouping_type)
        {
            scanner(c);
        }
    }
}

// somewhere in your program call the scanner method with:
scanner (Form1.ActiveForm);

public void ChangeColors(ControlsCollection parent)
{
   foreach(var c in parent)
   {
      if(c is Label)
      {
         c.ForeColor = Color.Aqua;
      }
      else if(c is Button)
      {
         c.ForeColor = Color.Yellow;
      }
      else if(c.HasChildren)
      {
          ChangeColors(c.Controls); // recurse
      }
   }
}

private void IterateOverAllControls(Control control)
{
  foreach (Control childControl in control.Controls)
  {
    IterateOverAllControls(childControl);
  }
  // There are no children of this control.
  if (c is Label)
  {
    ((Label)c).ForeColor = Color.Aqua;
  }
  else if (c is Button)
  {
    ((Button)c).BackColor = Color.Yellow;
  }
}

J4amieC wrote:

c should be control
 

OriginalGriff wrote:

I hope you have a fast UART! ....at least 164K...

public static byte ChannelState09; // Channel 9 uses this to communicate with the dispatcher

OriginalGriff wrote:

unlikely to be a thread that needs cancellation