//聲明委托
    delegate void MulticastTest();
    public class MulticastDelegateTest
    {
        
            
        public void Show()
        {
            MulticastTest multicastTest = new MulticastTest(MethodTest);
            multicastTest();



            Action action =new Action(MethodTest);
            action = (Action)MulticastDelegate.Combine(action, new Action(MethodTest2));
            action = (Action)MulticastDelegate.Combine(action, new Action(MethodTest3));
            action = (Action)MulticastDelegate.Remove(action, new Action(MethodTest3));
            action();

            //等同于上面
            action = MethodTest;
            action += MethodTest2;
            action += MethodTest3;
            action -= MethodTest3;

            foreach (Action action1 in action.GetInvocationList())
            {
                action1();
            }
            Console.WriteLine("==========");
            action();
                        


            Func<string> func = () => { return "我是Lambda"; };
            func += () => { return "我是func1"; };
            func += () => { return "我是func2"; };
            func += GetTest;
            func += GetTest; //給委托傳遞相同方法時 生成的委托實例也是相同的（也就是同一個委托）
            
            string result = func();
            Console.WriteLine(result);
            Console.WriteLine("==========");
        }


        #region 委托方法
        public void MethodTest()
        {
            Console.WriteLine("我是方法MethodTest()1");
        }

        public void MethodTest2()
        {
            Console.WriteLine("我是方法MethodTest()2");
        }

        public void MethodTest3()
        {
            Console.WriteLine("我是方法MethodTest()3");
        }

        public string GetTest()
        {
            return "我是方法GetTest()";
        }
        #endregion
    }

    //泛型委托聲明
    delegate void GenericDelegate<T>(T t);
    public class GenericDelegate
    {
        public static void InvokeDelegate()
        {
            GenericDelegate<string> genericDelegate = new GenericDelegate<string>(Method1);
            genericDelegate("我是泛型委托1");

            //官方版本（不帶返回值）
            Action<string> action = new Action<string>(Method1);
            action("我是泛型委托1");
            //Action<string, string, string, string, string, string, string, string, string, string, string, string, string, string, string, string>

            GenericDelegate<int> genericDelegate1 = new GenericDelegate<int>(Method2);
            genericDelegate1(2);

            //官方版本（帶回值）
            Func<string, string> func = new Func<string, string>(Method3);
            string ret = func("我是帶返回值Func委托");
            Console.WriteLine( ret );
            //Func<string, string, string, string, string, string, string, string, string, string, string, string, string, string, string, string,string>
        }



        #region 委托方法

        public static void Method1(string str)
        {
            Console.WriteLine(str);
        }

        public static void Method2(int num)
        {
            Console.WriteLine("我是泛型委托2 "+num);
        }

        public static string Method3(string str )
        {
            return str;
        }

        #endregion
    }