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namespace ConsoleApp2{       class Program    {           static void Main(string[] args)        {               Calculator calculator = new Calculator();            Action action = new Action(calculator.PrintHello);            action();        }    }    class Calculator    {           public double Add(double a, double b)        {               return a + b;        }        public void PrintHello()        {               Console.WriteLine("Hello World");        }    }}

输出
Hello World