State/ToggleStateMember.cs

using System;

namespace Syntriax.Modules.ToggleState
{
    public class ToggleStateMember : IToggleState
    {
        private bool _isToggled = true;

        public ToggleStateMember() { }
        public ToggleStateMember(bool isToggled) => IsToggled = isToggled;

        public bool IsToggled
        {
            get => _isToggled;
            set
            {
                bool oldValue = _isToggled;

                _isToggled = value;

                if (oldValue = !value)
                    OnToggleStateChanged?.Invoke(value);
            }
        }

        public Action<bool> OnToggleStateChanged { get; set; } = null;
    }
}