66장 이벤트(Event)

using System;

 public class ButtonEvent
{
    public static void Main()
    {
        //1.다중메서드호출
        Hello.Hi1();
        Hello.Hi2();

        //2.대리자 호출
        Say say;
        say = new Say(Hello.Hi1);
        say += new Say(Hello.Hi2);
        say();

        //3. 이벤트와 핸들러 호출
        Button btn = new Button(); //생성자
        btn.Click += new Say(Hello.Hi1);
        btn.Click += new Say(Hello.Hi2);
        btn.OnClick(); //핸들러 호출
      

    }
}

--------------------------------------------------------------

using System;
public delegate void Say();

public class Button
{  
    //1.이벤트 : 클릭
    public event Say Click;

    //2. 이벤트 처리기(핸들러)
    public void OnClick()
    {
        if (Click != null)
        {
            Click();
           
        }
    }
}
public class Hello
{
    public static void Hi1()
    {
        Console.WriteLine("안녕~");
    }
    public static void Hi2()
    {
        Console.WriteLine("반가워");

    }
}