Question

I have an arraylist of asp.net controls (textbox, etc).

I need to check if a control exists in the arraylist already before adding a new one. How can I do this, since the .Contains doesn’t seem to work properly on the ArrayList of controls.

This is what I’m trying to do:

Private Sub AddControl(ByVal ctrl As Control)
Dim al As ArrayList = DirectCast(Session("MyControls"), ArrayList)

If Not al.Contains(ctrl) Then
 al.Add(ctrl)
 Session("MyControls") = al
End Sub 

Answer 1

maybe this will work:

object[] items = al.ToArray();

bool result = items.Any(c => c.Id == ctrl.Id );

if ( !result )
{
   al.Add(ctrl);
   Session["MyControls"] = al;
}