Get All Web Controls of a Specific Type on a Page

Question

I have been pondering how I can get all controls on a page and then perform a task on them in this related question:

How to Search Through a C# DropDownList Programm

Answer 1

Here is a recursive version that returns a control collection of the requested type instead of utilizing another argument:

using System.Collections.Generic;
using System.Web.UI;
// ...
public static List GetControls(ControlCollection Controls)
where T : Control {
  List results = new List();
  foreach (Control c in Controls) {
    if (c is T) results.Add((T)c);
    if (c.HasControls()) results.AddRange(GetControls(c.Controls));
  }
  return results;
}

Insert into your class (static optional).