using System;

    public class Program

    {

        public static void Main(string[] args)

        {

            var a = new Animation();

​

            var waitForDelegate = new WaitForDelegate<IAnimation>(a);

​

            a.CallEnd();

        }

​

    }

​

    public interface IAnimation

    {

        event Action OnEnd;

    }

​

    public class Animation : IAnimation

    {

        public event Action OnEnd;

​

        public void CallEnd()

        {

            OnEnd();

        }

    }

​

​

    public class WaitForDelegate<T> where T : IAnimation

    {

        public WaitForDelegate(T animation)

        {

            animation.OnEnd += () => { Console.WriteLine("trigger"); };

        }

    }