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

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

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