Question

First post so hi! (please correct me if I use some term wrong)

I’ve got a class Screen in which I create an instance of another class named Player (let’s call this instance Player). Now, in Screen I have a method called ResetHUD which I would like to call from Player.

How would I do that? The only code inside ResetHUD is 1 line which sets a variable to another variable. As far as I know I can use EventHandler (but since ResetHUD doesn’t need any arguments I’m thinking that I’m using that wrong) or delegates (which I have no idea how to use).

Help is appreciated!

Answer 1

It sounds like you have a containment relationship… the Screen object contains one (or more?) Player objects.

When Screen creates Player, it can set a property on Player indicating the parent (creating) Screen object.

class Player
{
    private Screen parentScreen;

    public Player(Screen parentScreen) { this.parentScreen = parentScreen; }

    public MyMethodThatHasToCallScreensMethod()
    {
        parentScreen.ResetHUD();
    }
}


class Screen
{
    public Player CreatePlayer()
    {
        return new Player(this);
    }
}

You can also use events (events by the way can have parameters, or not, depending on what you need).

This is my favorite tutorial on events and delegates in C#. Starts simple and builds on each step.

http://www.akadia.com/services/dotnet_delegates_and_events.html