创建一个MulticastDelegateTest.cs类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CSharpAdvancedDelegate
{
    delegate void MultcastTest();
    /// <summary>
    /// 多播委托
    /// </summary>
    public class MulticastDelegateTest
    {
        public  void Show()
        {
            MultcastTest multcastTest = new MultcastTest(MethodTest);

            Action action = new Action(MethodTest);
            //Action action = MethodTest;  //也可以这样简写
            action += Method2;
            action += Method3;
            action += Method4;
            //循环遍历每一个委托
            foreach (Action act in action.GetInvocationList())
            {
                act();
            }

            Func<string ,string> func = new Func<string,string >(MethodTest1);
            string temp = func("我是方法MethodTest1(string str)");
            Console.WriteLine(temp);

            Func<string> func1 = () => { return "我是Lambda表达式，是匿名方法"; };
            Console.WriteLine(func1());
            func1 += () => { return "我是func2"; };
            Console.WriteLine(func1());
            func1 += () => { return "我是func3"; };           
            Console.WriteLine(func1());
        }

        //委托方法
        private void Method4()
        {
            Console.WriteLine("我是Method4()方法"); 
        }

        //委托方法
        private void Method3()
        {
            Console.WriteLine("我是Method3()方法");
        }

        //委托方法
        private void Method2()
        {
            Console.WriteLine("我是Method2()方法");
        }

        //委托方法
        public  void MethodTest()
        {
            Console.WriteLine("我是方法MethodTest()");
        }

         //委托方法
        public  string  MethodTest1(string str)
        {
            return str;
        }
    }
}

在Program.cs类中的入口类的Main函数中添加调用代码

static void Main(string[] args)
{
       Console.WriteLine("=================多播委托=================");
       MulticastDelegateTest multicastDelegateTest = new MulticastDelegateTest();
       multicastDelegateTest.Show();
}