Find all child controls of specific type using Enumerable.OfType() or LINQ

Question

Existed MyControl1.Controls.OfType() searches only thru initial collection and do not enters to children.

Is it possible to find all

Answer 1

I use an extension method to flatten control hierarchy and then apply filters, so that's using own recursive method.

The method looks like this

public static IEnumerable FlattenChildren(this Control control)
{
  var children = control.Controls.Cast();
  return children.SelectMany(c => FlattenChildren(c)).Concat(children);
}