FsmModel.cs

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using System;
using System.Collections.Generic;
using StateMachine.Events;

namespace StateMachine
{
    public class FsmModel<TS, TT>
    {
        public event EventHandler<StateChangeArgs<TS, TT>> StateChanged;

        public State<TS, TT> Current { get; set; }
		public State<TS, TT> StartState { get; set; }

		public Stack<State<TS, TT>> Stack { get; } = new Stack<State<TS, TT>>();
        public bool StackEnabled { get; set; }

        public Dictionary<TS, State<TS, TT>> States { get; } = new Dictionary<TS, State<TS, TT>>();

        public Dictionary<TS, Transition<TS, TT>> GlobalTransitions { get; } =
            new Dictionary<TS, Transition<TS, TT>>();

        public void AddStateChangedHandler(
            EventHandler<StateChangeArgs<TS, TT>> e)
        {
			StateChanged += e ?? throw FsmBuilderException.HandlerCannotBeNull();
        }

        public void RaiseStateChanged(StateChangeArgs<TS, TT> e) => StateChanged?.Invoke(this, e);
    }
}