Running code dynamically in C#

Question

I am working on a game in C#.

I have a list of events, that can happen. E.g

List<Event> _events = new List<Event>(); _events.Add(new Event("A goblin approaches", 2)); _events.Add(new Event("A gang of thieves approaches", 3)); _events.Add(new Event("Some money has been stolen", 3)); _events.Add(new Event("Three goblins approach", 4)); _events.Add(new Event("A guard dies of unknown causes",4));

The string in the Event constructor is the event name and the number is the difficulty.

I was wondering if I could also add code into the constructor that can be run later on if the event is called. I'd like different code in each event.

Something like

_events.Add(new Event("Some money has been stolen", 3, "Supply.Gold = Supply.Gold -50")); _events[2].runcode

I hope this makes sense, thanks

Why you can't dispatch fired event and execute your code from dispatcher? Or subclass Event and add virtual DoGood() method which will perform appropriate action? — dr11
– dr11, Commented Apr 7, 2015 at 12:45
@deeptowncitizen how can I pass a function into a constructor? — Bobby
– Bobby, Commented Apr 7, 2015 at 12:51

dr11 · Accepted Answer · 2015-04-07 13:00:40Z

1

With this approach you can create events with simple implementation. And also difficult events with a lot of code (by extending Event class).

public class EventContext
{
    public int Gold { get; set; }
}

public interface IEvent
{
    void Do(EventContext context);
}

public abstract class Event : IEvent
{
    protected Event(string title, int difficulty)
    {
        Title = title;
        Difficulty = difficulty;
    }

    public string Title { get; private set; }
    public int Difficulty { get; private set; }


    public abstract void Do(EventContext context);
}

public class SimpleEvent : Event
{
    private readonly Action<EventContext> _callback;

    public SimpleEvent(string title, int difficulty, Action<EventContext> callback)
        : base(title, difficulty)
    {
        _callback = callback;
    }

    public override void Do(EventContext context)
    {
        _callback(context);
    }
}

internal class Program
{
    private static void Main(string[] args)
    {
        var gameContext = new EventContext {Gold = 100};
        var events = new List<IEvent>();
        events.Add(new SimpleEvent("Some money has been stolen", 3, context => context.Gold -= 10));

        events.First().Do(gameContext);
    }
}

But I believe it can be better to separate event type and event handler.

answered Apr 7, 2015 at 13:00

dr11

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1 Comment

Bobby Over a year ago

Thank you for your time and help. I have not used actions before. I will definitely have a read up. Thanks again

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