public interface ISubject<T> where T : class

    {

        /// <summary>

        ///

        /// </summary>

        /// <param name="action">为true表示注册，false表示注销</param>

        int RegistNotify(bool action, IObserver<T> ob);

    }

    public interface IObserver<T> where T : class

    {

        void MessageNotify(T message);

    }

    class Observer : ObserverPattern.IObserver<Msg>

    {

        public Observer(ISubject<Msg> sub)

        {

            sub.RegistNotify(true, this);  // 注册

        }

        void ObserverPattern.IObserver<Msg>.MessageNotify(Msg message)

        {

            DateTime cur = DateTime.Now;  // 当接收到通知时记录下当前时间

            Debug.WriteLine("s : " + cur.Second + " ms : " + cur.Millisecond);

        }

    }

    public partial class Form1 : Form, ISubject<Msg>

    {

        List<ObserverPattern.IObserver<Msg>> m_observers;

        public Form1()

        {

            InitializeComponent();

            this.Load += Form1_Load;

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            m_observers = new List<ObserverPattern.IObserver<Msg>>();

            Observer ob = new Observer(this);

            Observer ob2 = new Observer(this);

            Observer ob3 = new Observer(this);

            Observer ob4 = new Observer(this);

            Observer ob5 = new Observer(this);

            Observer ob6 = new Observer(this);

            Observer ob7 = new Observer(this);

            Observer ob8 = new Observer(this);

            Observer ob9 = new Observer(this);

            Observer ob10 = new Observer(this);

            Observer ob11 = new Observer(this);

            Observer ob12 = new Observer(this);

            Observer ob13 = new Observer(this);

            Observer ob14 = new Observer(this);

            Observer ob15 = new Observer(this);

            Observer ob16 = new Observer(this);

            Observer ob17 = new Observer(this);

        }

        int ISubject<Msg>.RegistNotify(bool action, ObserverPattern.IObserver<Msg> ob)

        {

            if (action) { m_observers.Add(ob); return ; }

            m_observers.Remove(ob);

            return ;

        }

        private void button1_Click(object sender, EventArgs e)

        {

            Msg message = new Msg() { Ident = , Data = null };

            foreach (var ob in m_observers)

            {

                Task.Factory.StartNew(() => ob.MessageNotify(message));

            }

        }

        private void button2_Click(object sender, EventArgs e)

        {

            Msg message = new Msg() { Ident = , Data = null };

            foreach (var ob in m_observers)

            {

                new Thread(() => { ob.MessageNotify(message); }) { IsBackground = true, }.Start();

            }

        }

    }

}