ControlGUI/GUI/GUIUtils/EventPerformer.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GUI.GUIUtils
{
    public class EventPerformer<ListenerType> : LinkedList<ListenerType> where ListenerType : class
    {
        public void AddSafe(ListenerType listener)
        {
            AddFirst(listener);
        }

        public void Perform(Action<ListenerType> performFunc)
        {
            foreach (var it in this)
            {
                performFunc?.Invoke(it);
            }
        }
    }
}