Clear controls does not dispose them - what is the risk?

Question

There are multiple threads(a, b, c etc.) about the fact that Clear() ing items in the .NET component containers does not Dispose them(by ca

Answer 1

@Hans Passant answer is good but in case of asynchronous programming you should consider to remove the object before dispose it to avoid some thread to iterate over a disposed object.

More or less something like this:

public static class ExtensionMethods {
  public static void Clear(this Control.ControlCollection controls, bool dispose) {
    for (int ix = controls.Count - 1; ix >= 0; --ix) {
      var tmpObj = controls[ix];
      controls.RemoveAt(ix);
      if (dispose) tmpObj.Dispose();
    }
  }
}