Dynamic/Runtime Listener registration

You might want to add a listener during runtime for a certain event. Have a look at the below snippet

using Assembly_CSharp.EventBusForUnity;

public class RuntimeListenerExample : MonoBehaviour
{
    public class RegisterHelloWorldEvent
    {
        public string Message;
    }
    
    private void Start() 
    {
        Action<RegisterHelloWorldEvent> listener = message =>
        {
            Debug.Log($"Message: {message.Message}");
        };

        EventBus.Register(listener);

        EventBus.Send(new RegisterHelloWorldEvent()
        {
            Message = "Hello World"
        });

        EventBus.Deregister(listener);
    }
}

Of course, this also works outside a MonoBehaviour component and can be called anywhere.

When following this pattern it is important that what you pass to EventBus.Register() is the same as EventBus.Deregister(). For example if you do the below you will have a bad time:

Action<RegisterHelloWorldEvent> listener = message =>
{
    Debug.Log($"Message: {message.Message}");
};

Action<RegisterHelloWorldEvent> listenerTwo = message =>
{
    Debug.Log($"Message: {message.Message}");
};

EventBus.Register(listener);
EventBus.Deregister(listenerTwo); // won't work!