深入讲解C#中委托的+=和-=

using System;

namespace Wolfy.DelegateDemo

{

    internal class Program

    {

        private static ShowMsg showMsg;

        private static MathOperation mathOperation;

        private static void Main(string[] args)

        {

            Program.showMsg = (ShowMsg)Delegate.Combine(Program.showMsg, new ShowMsg(Program.ShowHello));

            Program.showMsg = (ShowMsg)Delegate.Combine(Program.showMsg, new ShowMsg(Program.ShowHello1));

            Program.showMsg("大家新年好啊");

            Program.mathOperation = (MathOperation)Delegate.Combine(Program.mathOperation, new MathOperation(Program.Add));

            Program.mathOperation = (MathOperation)Delegate.Combine(Program.mathOperation, new MathOperation(Program.Multiply));

            Console.WriteLine(Program.mathOperation(1, 2).ToString());

            Console.Read();

        }

        private static void ShowHello(string msg)

        {

            Console.WriteLine("哈喽：" + msg);

        }

        private static void ShowHello1(string msg)

        {

            Console.WriteLine("哈喽1：" + msg);

        }

        private static int Add(int a, int b)

        {

            return a + b;

        }

        private static int Multiply(int a, int b)

        {

            return a * b;

        }

    }

}