[DllImport("kernel32.dll")]
    public static extern SafeWaitHandle CreateWaitableTimer(IntPtr lpTimerAttributes, bool bManualReset, string lpTimerName);

    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool SetWaitableTimer(SafeWaitHandle hTimer, [In] ref long pDueTime, int lPeriod, IntPtr pfnCompletionRoutine, IntPtr lpArgToCompletionRoutine, bool fResume);
    /// <summary>
    /// 设置唤醒时间
    /// </summary>
    private void SetWaitForWakeUpTime(DateTime OnTime)
    {
      DateTime utc = OnTime;
      long duetime = utc.ToFileTime();
            using (SafeWaitHandle handle = CreateWaitableTimer(IntPtr.Zero, true, "MyWaitabletimer"))
      {
        if (SetWaitableTimer(handle, ref duetime, 0, IntPtr.Zero, IntPtr.Zero, true))
        {
          using (EventWaitHandle wh = new EventWaitHandle(false, EventResetMode.AutoReset))
          {
            wh.SafeWaitHandle = handle;
            Application.SetSuspendState(PowerState.Hibernate, true, false);
            wh.WaitOne();
          }
        }
        else
        {
          throw new Win32Exception(Marshal.GetLastWin32Error());
        }
      }

    }

------解决方案--------------------
定时开机
1.bios设置
2.网络唤醒（大部分主板上网卡支持，同样在bios设置打开，不少宽带路由也可以如此唤醒某台电脑）  
3。bios设置一通电就开电脑，这样有不少带数据线的ups有定时开机功能，这时也可开电脑

------解决方案--------------------
现在几乎所有主板bios都支持普通的usb口鼠标键盘消息就能唤醒电脑的。

------解决方案--------------------

1.开启bios网络唤醒功能;
2.在被控机的供电系统接入电控定时器;
3.采购定时器,按照厂商提供的API实现控制程序;
4.在被控机(或其他计算机)用软件设定定时器开启时间;