观察者模式:定义了对象之间的一对多依赖。这样一来,当一个对象改变状态时,他的所有依赖者都会收到通知并自动更新。
观察者模式:定义了对象之间的一对多依赖。这样一来,当一个对象改变状态时,他的所有依赖者都会收到通知并自动更新。
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Observer_Patterns
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Collections ;
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namespace Observer_Patterns
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{
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public class Program
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{
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static void Main(string[] args)
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{
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WeatherData weatherData = new WeatherData();
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CurrentCoditionsDisplay currentDisplay = new CurrentCoditionsDisplay(weatherData);
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weatherData.setMeasurements(80,65,30.4f);
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weatherData.setMeasurements(82, 70, 29.2f);
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weatherData.setMeasurements(78,90,29.2f);
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}
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}
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/**//// <summary>
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/// 主题接口,用来注册或者删除观察者
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/// </summary>
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public interface ISubject
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{
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void RegisterObserver(IObserver o);
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void RemoveObserver(IObserver o);
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void NotifyObservers();
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}
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/**//// <summary>
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/// 观察者接口,所有观察者都必须实现update方法
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/// </summary>
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public interface IObserver
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{
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void update(float temperature, float humidity, float pressure);
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}
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/**//// <summary>
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/// 布告板接口,
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/// </summary>
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public interface IDisplayElement
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{
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void display();
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}
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/**//// <summary>
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/// 实现气象站
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/// </summary>
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public class WeatherData : ISubject
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{
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private ArrayList observers;
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private float temperature;
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private float humidity;
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private float pressure;
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public WeatherData()
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{
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observers = new ArrayList();
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}
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public void RegisterObserver(IObserver o)
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{
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observers.Add(o);
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}
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public void RemoveObserver(IObserver o)
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{
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int i = observers.IndexOf(o);
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if (i > 0)
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{
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observers.Remove(i);
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}
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}
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public void NotifyObservers()
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{
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for (int i = 0; i < observers.Count; i++)
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{
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IObserver observer = (IObserver)observers[i];
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observer.update(this.temperature,this.humidity,this.pressure );
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}
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}
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public void MeasurementsChanged()
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{
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NotifyObservers();
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}
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public void setMeasurements(float temperature, float humidity, float pressure)
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{
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this.temperature = temperature;
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this.humidity = humidity;
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this.pressure = pressure;
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MeasurementsChanged();
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}
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}
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/**//// <summary>
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/// 一个布告板的实现
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/// </summary>
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public class CurrentCoditionsDisplay : IObserver, IDisplayElement
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{
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private float temperature;
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private float humidity;
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private ISubject weatherData;
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public CurrentCoditionsDisplay(ISubject weatherData)
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{
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this.weatherData = weatherData;
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weatherData.RegisterObserver(this);
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}
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public void update(float temperature, float humidity, float pressure)
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{
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this.temperature = temperature;
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this.humidity = humidity;
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display();
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}
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public void display()
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{
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Console.WriteLine("Current Conditions: " + temperature.ToString()
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+" F degrees and "+humidity.ToString()
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+" % humidity" );
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}
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}
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}
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