c# Observers模式 示例

用于显示数据的接口定义：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Observers
{
    interface IDisplay
    {
        void Display();
    }
}

天气数据类接口定义
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Observers
{
    interface IWatherData
    {
        void AddObserver(IObservers o);
        void DelObserver(IObservers o);
        void SetWatherData(int Temperature, int Humidity);
    }
}

 

观察者接口定义：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Observers
{
    interface IObservers
    {
        void update(int Temperature, int Humidity);
    }
}

天气数据类的实现：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace Observers
{
    class WatherData:IWatherData
    {
        private int Temperature = 0;
        private int Humidity = 0;
        private ArrayList observers;
        public WatherData()
        {
            observers = new ArrayList();
        }

        public void AddObserver(IObservers o)
        {
            observers.Add(o);
        }

        public void DelObserver(IObservers o)
        {
            if (observers.IndexOf(o) > 0)
            {
                observers.RemoveAt(observers.IndexOf(o));
            }
        }

        public void SetWatherData(int intTemperature, int intHumidity)
        {
            Temperature = intTemperature;
            Humidity = intHumidity;
            WatherDataChanged();
        }

        public void WatherDataChanged()
        {
            for (int i = 0; i < observers.Count; i++)
            {
                ((IObservers)observers[i]).update(Temperature, Humidity);
            }
        }
    }
}

观察者类的实现：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Observers
{
    class Observer1:IObservers,IDisplay
    {
        private int intTemperature;
        private int intHumidity;
        public void update(int Temperature, int Humidity)
        {
            intTemperature = Temperature;
            intHumidity = Humidity;
            Display();
        }

        public void Display()
        {
            Console.WriteLine("Observer1:Temperature=" + intTemperature + ",Humidity=" + intHumidity);
        }
    }
}

主方法调用：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Observers
{
    class Program
    {
        static void Main(string[] args)
        {
            IWatherData watherdata = new WatherData();
            IObservers observer1 = new Observer1();
            watherdata.AddObserver(observer1);
            watherdata.SetWatherData(100,200);
            watherdata.SetWatherData(200, 100);
            Console.ReadKey();
        }
    }
}