C # 2.0 Subscribing to dynamic events with a known event signature

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C # dynamic event subscription

I would like to be able to attach an event handler to an event fired from a dynamically created object. I do this to make sure that my JavaScript and other non-.NET code cannot connect to object events.

My event signature in the object:

delegate void MediaItemFellbackDelegate (int id, string name, string path);

Here is my DynamicHost code:

public delegate void MediaItemFellbackDelegate(int id, string name, string path);

public void MediaItemFellback(int id, string name, string path)
{
}


private void HandleEvent(string eventName, Delegate handler)
{
  try
  {
    BindingFlags bindingFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
    EventInfo mediaItemFellback = m_PlayerType.GetEvent(eventName, bindingFlags);
    mediaItemFellback.AddEventHandler(m_Player, handler);
  }
  catch (Exception ex)
  {
    MessageBox.Show(ex.ToString());
  }
}

HandleEvent("MediaItemFellback", new MediaItemFellbackDelegate(this.MediaItemFellback));

but I get an exception:

An object of type 'DynamicHost.Main + MediaItemFellbackDelegate' cannot be converted to type 'Player.MediaItemFellbackDelegate'.

in the call to AddEventHandler ().

Of course, these are different types, but the signatures are identical.

What is wrong here?

Answer 1

, , .

, HandleEvent:

private void HandleEvent(string eventName, Delegate handler)
{
  try
  {
    BindingFlags bindingFlags = BindingFlags.Instance | 
                                BindingFlags.Public | BindingFlags.NonPublic;
    EventInfo mediaItemFellback = m_PlayerType.GetEvent(eventName, bindingFlags);
    Delegate correctHandler = Delegate.CreateDelegate(
        mediaItemFellback.EventHandlerType, handler.Target, handler.Method);
    mediaItemFellback.AddEventHandler(m_Player, correctHandler);
  }
  catch (Exception ex)
  {
    MessageBox.Show(ex.ToString());
  }
}