public delegate void TimingEventHandler(object sender, TimingEventArgs e);
 
    public sealed class TimingController
    {
        // 省略单例模式代码
        MachineParameters Machines = MachineParameters.GetInstance();

        private Timer TimerGlobal;

        public event TimingEventHandler WarmedUp;

        private TimingController()
        {
            //定时器初始化
        }

        public void Start()
        {
            TimerGlobal.Enabled = true;
        }

        void TimerGlobal_Elapsed(object sender, ElapsedEventArgs e)
        {
            for (int i = 1; i < 8; i++)
            {
                Machines.M[i].ClockStep += 100;
                TimingEventArgs e = new TimingEventArgs(Machines.M[i].ClockStep);
                CheckWarmedUp(Machines.M[i], e);
            }
        }

        private void CheckWarmedUp(object sender, TimingEventArgs e)
        {
            Machine machine = (Machine)sender;
            if (machine.ClockStep == machine.WarmUpTime)
            {
                //UpdateData.UpdateMachine(sender, e);
###                WarmedUp(sender, e);
            }
        }

        void OnWarmedUp(object sender, TimingEventArgs e)
        {
            if (WarmedUp != null)
            {
                WarmedUp(sender, e);
            }
        }

    public sealed class UpdateData
    {
        // 省略单例模式代码        
        public void UpdateMachine(object sender, TimingEventArgs e)
        {
            Machine machine = (Machine)sender;
***            Trace.WriteLine(id.ToString() + "------" + e.ClockRate.ToString());
        }
    }

    public class Machine //实例类
    {
        TimingController Timing = TimingController.GetInstance();
        UpdateData Update = UpdateData.GetInstance();
        //省略其余定义
        //类中用到了 TimingController 和 UpdateData ，因此声明如上
        public Machine(int id)
        {
            Timing.WarmedUp += new TimingEventHandler(Update.UpdateMachine);
        }
    }