delegates-basics-covariance-contravariance.cs

 class Person { }
    class Man Person { }
 
    class Program
    {
        // Define the delegate.
        public delegate Person HandlerMethod();
 
        public delegate Person HandlerMehtod2(Man p);
 
        public static Person PersonHandler()
        {
            return null;
        }
 
        public static Man ManHandler()
        {
            return null;
        }
 
        public static Man ManHandler2(Person person)
        {
            return null;
        }
 
        static void Test()
        {
            HandlerMethod handlerPerson = PersonHandler;
 
            // Covariance enables this assignment.
            HandlerMethod handlerMan = ManHandler;
 
            //Contravariance enables this assignment.
            HandlerMehtod2 handlerMehtod = ManHandler2;
            ManHandler2(new Man());
        }
 
 
 
    }