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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