Barebones Entity Component System in C#

ECS.cs

using System.Collections.Generic;
using System.Linq;

namespace ProjectCC
{

    class World
    {
        private List<Entity> Entities;
        private List<System> Systems;

        public World()
        {
            this.Entities = new List<Entity>();
            this.Systems = new List<System>();
        }

        public void AddSystem(System sys)
        {
            this.Systems.Add(sys);
        }

        public void Step()
        {
            List<Component> entComps, comps;
            foreach (var ent in this.Entities)
            {
                entComps = ent.Components;
                foreach (var sys in this.Systems)
                {
                    comps = entComps.Where(
                        comp => sys.ComponentNames.Contains(comp.Name)).ToList();
                    sys.Run(comps);
                }
            }
        }
    }

    class Entity
    {
        private int id;
        public List<Component> Components { get; }

        public Entity(List<Component> comps)
        {
            this.id = IdGenerator.New();
            this.Components = comps;
        }

        public void AddComponent(Component comp)
        {
            this.Components.Add(comp);
        }

        public void RemoveComponent(string name)
        {
            foreach (var comp in this.Components)
            {
                if (comp.Name == name)
                {
                    this.Components.Remove(comp);
                }
            }
        }

    }

    abstract class Component
    {
        // user-defined, contains data
        abstract public string Name { get; }
    }

    abstract class System
    {
        // user-defined, contains logic
        abstract public List<string> ComponentNames { get; }
        abstract public void Run(List<Component> comps);
    }
}

Thanks for posting.