using System;
using System.Collections.Generic;
using System.Text;

namespace _8_2
{
    class Program
    {
        public delegate float calcincome(float hourlywages);

      
        public static readonly calcincome monthlyincome = new calcincome(person.calcmonthlyincome);
        public static readonly calcincome annualincome = new calcincome(person.calcannualincome);

        public static readonly calcincome allincomes = monthlyincome + annualincome;

        static void Main(string[] args)
        {
            try
            {
                Console.WriteLine(Program.monthlyincome(40));
                Console.WriteLine(Program.annualincome(40));

                Console.WriteLine(Program.allincomes(40)); //当调用allincomes委托时，monthlyincome和annualincome委托也被调用。
                // 返回值 好像是 最后一个委托的值。疑惑中？

                //也可以 使用委托调用清单以更精细地控制可调用函数清单。
                foreach (calcincome del in allincomes.GetInvocationList())
                {
                    Console.WriteLine(del(40));
                }
             
            }
            catch (Exception e)
            {
                Console.WriteLine(e.StackTrace);
            }

        }
    }

    public class person
    {
        public float income;
        public static float calcmonthlyincome(float hourlywages)
        {
            Console.WriteLine("calcmonthlyincome");
            return hourlywages * 60;
        }

        public static float calcannualincome(float hourlywages)
        {
            Console.WriteLine("calcannualincome");
            return hourlywages * 160 * 12;
        }
    }
}

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