I just finished chap 4 from "Beginning XNA 3.0 Game Programming from Novice to Professional" but I am getting an error stating "'RockRain002.ActionScene.Hide()': no suitable method found to override". I need help (1) understanding what this error means and (2) help solving it please.
Below is sections of the code showing everywhere "Hide" appears, with the part in red showing where the error is.


public class GameScene : Microsoft.Xna.Framework.DrawableGameComponent
    {
        public virtual void Hide()
        {
            Visible = false;
            Enabled = false;
        }
    }


public class StartScene : GameScene
    {
        public override void Hide()
        {
            MediaPlayer.Stop();
            base.Hide();
        }

    }


public class ActionScene : Microsoft.Xna.Framework.DrawableGameComponent
    {
        public override void Hide()
        {
            //stop the background music
            MediaPlayer.Stop();

            //stop the rumble
            rumblePad.Stop(PlayerIndex.One);
            rumblePad.Stop(PlayerIndex.Two);

            base.Hide();
        }
    }


public class Game1 : Microsoft.Xna.Framework.Game
    {
        protected void ShowScene(GameScene scene)
        {
            activeScene.Hide();
            activeScene = scene;
            scene.Show();
        }
    }


Thank you for any help,
Blindsyde

The override keyword can only be used to override virtual methods - that is - methods defined using the virtual keyword - so you can think of the override keyword as a partner keyword to the virtual keyword (and the abstract keyword).

Your GameScene class is ok, it has defined a virtual method called Hide.

To override the Hide method in a subclass, the subclass must inherit from your GameScene class.

The compiler error is telling you that the ActionScene class does not inherit from a class with a virtual Hide method - that is the clue to your error.

I am guessing you want your ActionScene class to subclass GameScene, rather than DrawableGameComponent. If you fix this, you fix your problem.

Thanks, changing the ActionScene to a GameScene fixed the problem I was having (and oddly enough then drew attention to a few spelling mistakes!).

Thank you for explaining the override and virtual keywords. This was the first time I had come across virtual, so I'm going to have to find out more about it, and what all it can do.

Blindsyde

Blindsyde:

so I'm going to have to find out more about it, and what all it can do.

Look up Polymorphism

Thanks, I will