공변성, 반공변성

  class Program
    {
        static void Main(string[] args)
        {
            //반공변성 
            Action<object> broadAction = (object data) =>
            {
                Console.WriteLine(data);
            };
 
            Action<string> narrowAction = broadAction;
 
            // 공변성
            Func<string> narrowFunction = () => Console.ReadLine();
 
            Func<object> broadFunction = narrowFunction;
 
            
            //반공변성과 공변성 조합
 
            Func<object, string> func1 = (object data) => data.ToString();
            Func<string, object> func2 = func1;
 
            var items = new string[] { "Moe", "Larry", "Curly" };
            var actions = new List<Action>();
             
            for (int i = 0; i < items.Count(); i++)
            {
                int j = i;
                Console.WriteLine(items[j]);
                actions.Add(() => { Console.WriteLine(items[j]); });
            }
            //foreach (string item in items)
            //{
            //    actions.Add(() => { Console.WriteLine(item); });
            //}
 
            foreach (Action action in actions)
            {
                action();
            }
 
        }
    }