如果您使用的是托管代码，那么这会在 SystemEvents.PowerModeChanged 事件中公开.

If you're using managed code then this is exposed in the SystemEvents.PowerModeChanged event.

SystemEvents.PowerModeChanged += OnPowerModeChanged;

private void OnPowerModeChanged(object sender, PowerModeChangedEventArgs e) {
  if (e.Mode == PowerModes.Suspend) {
    // Going to sleep
  }
}

如果您使用本机代码，那么您希望在 WindowProc 处理程序中监听 WM_POWERBROADCAST 消息.

If you're using native code then you want to listen for the WM_POWERBROADCAST message in your WindowProc handler.

LRESULT WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
  if (WM_POWERBROADCAST == message && PBT_APMSUSPEND == wParam) {
    // Going to sleep
  }
}