c# 멀티캐스트 대리자 샘플

delegate void Del(string s);

class TestClass {
    static void Hello(string s) {
        Console.WriteLine("  Hello, {0}!", s);
    }

    static void Goodbye(string s) {
        Console.WriteLine("  Goodbye, {0}!", s);
    }

    public static void Test() {
        Del a, b, c, d;

        // Create the delegate object a that references 
        // the method Hello:
        a = Hello;

        // Create the delegate object b that references 
        // the method Goodbye:
        b = Goodbye;

        // The two delegates, a and b, are composed to form c: 
        c = a + b;

        // Remove a from the composed delegate, leaving d, 
        // which calls only the method Goodbye:
        d = c - a;

        Console.WriteLine("Invoking delegate a:");
        a("A");

        Console.WriteLine("Invoking delegate b:");
        b("B");

        // A, B 둘다 호출됨
        Console.WriteLine("Invoking delegate c:");
        c("C");

        // A, B 에서 A 가 빠진 B 만 호출됨
        Console.WriteLine("Invoking delegate d:");
        d("D");
    }
}

Invoking delegate a:
  Hello, A!
Invoking delegate b:
  Goodbye, B!
Invoking delegate c:
  Hello, C!
  Goodbye, C!
Invoking delegate d:
  Goodbye, D!