// 去除天气预报显示器 public void RemoveDisplayer(IWeatherDisplay displayer) { if (Displayers != null) { Displayers.Remove(displayer); } }
// 添加天气预报显示器 public void AddDisplayer(IWeatherDisplay displayer) { if (Displayers == null) { Displayers = new List <IWeatherDisplay>(); } Displayers.Add(displayer); }