Semaphor.cs

namespace ConsoleApp1
{
    class Symaphor
    {
        int _currentstate = 0;
        /*
         0 - красный
         1 - зелёный
         */
        public delegate void SemaphorStateHandler(string mes);
        public event SemaphorStateHandler TimerSet;

        public Symaphor()
        {
            _currentstate = 0;
        }

        public void SetSemaphor()
        {
            if (_currentstate == 0)
                _currentstate = 1;
            else
                _currentstate = 0;
            if (TimerSet != null)
            {
                if (_currentstate == 1)
                    TimerSet("Красный");
                else
                    TimerSet("Зелёный");
            }
        }
    }
}