C#•2y ago

❔ OOP Event Handler implementation

Hi, I am using D#+ (DiscordSharpPlus) and I am trying to figure out a class based implementation for handling events, instead of doing something like client.Ready += OnReady where I subscribe to the event in a functional programming way, I would like to have a class like this

public class BaseEventHandler {
  public EventType EventType; // EventType is an enum 
  // See https://github.com/Naamloos/ModCore/blob/5d9a993619bce03b84ce922dd80ff7cd7c966691/ModCore/Extensions/Enums/EventType.cs

  public BaseEventHandler(EventType eventType) => EventType = eventType;
}

public class BaseEventHandler {
  public EventType EventType; // EventType is an enum 
  // See https://github.com/Naamloos/ModCore/blob/5d9a993619bce03b84ce922dd80ff7cd7c966691/ModCore/Extensions/Enums/EventType.cs

  public BaseEventHandler(EventType eventType) => EventType = eventType;
}

public class OnReadyEventHandler : BaseEventHandler {
  private readonly DataContext _dataContext;

  public OnReadyEventListener(DataContext dataContext): base(EventType.Ready) {
    _dataContext = dataContext;
  }

  public Task Handler(DiscordClient client) {
    // Handle event in here
  }
}

public class OnReadyEventHandler : BaseEventHandler {
  private readonly DataContext _dataContext;

  public OnReadyEventListener(DataContext dataContext): base(EventType.Ready) {
    _dataContext = dataContext;
  }

  public Task Handler(DiscordClient client) {
    // Handle event in here
  }
}

I preferably want to use something like assembly scanning to automatically get these Handlers but I am not familiar enough wit Reflection to get the parameter passed to base and then also somehow connecting this to the event (I guess I need to use addEventListener())

public void Register(Assembly assembly) {
  var handlers = assembly.GetTypes().Where(x => 
    x.IsSubclassOf(typeof(BaseEventHandler)) &&
    !x.IsInterface &&
    !x.IsAbstract
  )

  for (Type handler in handlers) {
    var _event = client.GetType().GetEvents().First(ev => ev.Name == handler.EventType.ToString());
    // How do I subscribe now?
  }

  
}

public void Register(Assembly assembly) {
  var handlers = assembly.GetTypes().Where(x => 
    x.IsSubclassOf(typeof(BaseEventHandler)) &&
    !x.IsInterface &&
    !x.IsAbstract
  )

  for (Type handler in handlers) {
    var _event = client.GetType().GetEvents().First(ev => ev.Name == handler.EventType.ToString());
    // How do I subscribe now?
  }

  
}

2 Replies

BlackBearFTW•2y ago

I'm using the EventType enum because I would like to avoid typos

Accord•2y ago

Looks like nothing has happened here. I will mark this as stale and this post will be archived until there is new activity.

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❔ OOP Event Handler implementation