氣象站--觀察者模式

    /* 氣象站 */

    public interface Subject { void Regist(Observer observer); void Remove(Observer observer); void Notify(); } public interface Observer { void UpDate(WeatherData weahterData); } public interface DisplayElement { void Display(); } public class WeatherData : Subject { private float m_temperature; public float Temperature { get { return m_temperature; } set { if (m_temperature != value) { m_temperature = value; Notify(); } } } private List<Observer> m_listObservers = new List<Observer>(); public void Regist(Observer observer) { if (!m_listObservers.Contains(observer)) { m_listObservers.Add(observer); } } public void Remove(Observer observer) { if (m_listObservers.Contains(observer)) { m_listObservers.Remove(observer); } } public void Notify() { for (int i = 0; i < m_listObservers.Count; i++) { m_listObservers[i].UpDate(this); } } } public class DisplayWeatherA : DisplayElement, Observer { float Temperature; public void Display() { Console.WriteLine(Temperature); } public void UpDate(WeatherData weahterData) { Temperature = weahterData.Temperature; } } public class DisplayWeatherB : DisplayElement, Observer { float Temperature; public void Display() { Console.WriteLine(Temperature); } public void UpDate(WeatherData weahterData) { Temperature = weahterData.Temperature; } } class Program { static void Main(string[] args) { DisplayWeatherA dwa = new DisplayWeatherA(); DisplayWeatherB dwb = new DisplayWeatherB(); WeatherData wd = new WeatherData(); wd.Regist(dwa); wd.Regist(dwb); wd.Temperature = 32; dwa.Display(); dwb.Display(); Console.ReadKey(); } }