Delegate 与 MulticastDelegate 委托的单波与多波模式

class TestDelegate  
    {  
        public delegate void EventHanding();  
        public event EventHanding OnFireEvnet;  
          
        protected void RegistEvent()  
        {  
            Delegate d1 = new EventHanding(test1);  
  
            Delegate d2 = new EventHanding(test2);  
           
            Delegate d3 = new EventHanding(test3);  
  
            Delegate d4 = new EventHanding(test4);  
  
            Delegate newEvent1 = Delegate.Combine(d1, d2);  
  
            Delegate newEvent2 = Delegate.Combine(d3, d4);  
  
            //新合并的委托是一个新的对象   
            if (Object.ReferenceEquals(d2, newEvent1))  
            {  
                string str = string.Empty;  
            }              
            if (d2.Method.ToString().CompareTo(newEvent1.Method.ToString())==0)  
            {  
                string str = string.Empty;  
            }  
  
            EventHanding newEvent = (EventHanding)Delegate.Combine(newEvent1, newEvent2);  
            OnFireEvnet += newEvent;  
        }  
  
        protected void FireEvent()  
        {  
            //单波   
            MulticastDelegate del = (MulticastDelegate)OnFireEvnet;  
            del.Method.Invoke(this, null);  
  
            //多波   
            OnFireEvnet();  
        }  
  
        int i = 0;  
        public void test1()  
        {  
            i++;  
              
        }  
        public void test2()  
        {  
            i++;  
        }  
        public void test3()  
        {  
            i++;  
  
        }  
        public void test4()  
        {  
            i++;  
        }  
  
        public static void Test()  
        {  
            TestDelegate test = new TestDelegate();  
            test.RegistEvent();  
            test.FireEvent();  
        }  
    }