namespace 自定义委托
{
    class Program
    {
        Action<string> actHandler;

        public Program()
        {
            actHandler += Test1;
            actHandler += Test2;
        }

        public void Test1(string str)
        {
            Console.WriteLine("I am Test1 "+str);
        }

        public void Test2(string str)
        {
            Console.WriteLine("I am Test2 "+str);
        }

        public void Display()
        {
            actHandler("nice");
        }

        static void Main(string[] args)
        {
            Program obj = new Program();
            obj.Display();
        }
    }
}