程序代码：

using System;
using System.Collections.Generic;
using System.Linq;

namespace PropertySample
{
    class Program
    {
        static void Main(string[] args)
        {
            Calculator calculator = new Calculator();
            Action action1 = calculator.Report;               //
            Action action2 = new Action(calculator.Report);   //
            action1();
            action2();
        }
    }

    class Calculator
    {
        public void Report()
        {
            Console.WriteLine("I have 3 methods.");
        }
    }
}