观察者模式 ObserverPattern

using System;
using System.Collections;
using System.Collections.Generic;
abstract class PaperBusiness
{
    ArrayList customerList=new ArrayList();
    public void addCustomer(customer customer)
    {
        customerList.Add(customer);
    }
    public void removeCustomer(customer customer)
    {
        if (customerList.IndexOf(customer) != -1)
            customerList.Remove(customer);
    }
    public void NoticeCustomer()
    {
        foreach (customer c in customerList)
        {
            c.Noticy();
        }
    }
    
}

观察者抽象

using System;

class ChinaPaperBusiness : PaperBusiness
{
    
    private string _chairManName;
    private int _worksNumber;

    public string ChairManName
    {
        get { return _chairManName; }
        set { _chairManName = value; }
    }
    public int WorksNumber
    {
        get { return _worksNumber; }
        set { _worksNumber = value; }
    }
}

观察者抽象的实现A

interface customer
{
    void Noticy();
}

接收者接口

using System;
class Jim : customer
{
    public PaperBusiness _paperBusiness;
    public Jim(PaperBusiness paperBusiness)
    {
        _paperBusiness = paperBusiness;
        _paperBusiness.addCustomer(this);
    }
    #region customer 成员

    public void Noticy()
    {
        Console.WriteLine("Jim you must take you paper until 18:00 today.");
    }
    public void cancelSubScribe()
    {
        _paperBusiness.removeCustomer(this);
    }

    #endregion
}

接收者A

using System;
class Lucy : customer
{
     public PaperBusiness _paperBusiness;
    public Lucy(PaperBusiness paperBusiness)
    {
        _paperBusiness = paperBusiness;
        _paperBusiness.addCustomer(this);
    }
    #region customer 成员

    public void Noticy()
    {
        Console.WriteLine("Lucy you must take you paper until 18:00 today.");
    }
    public void cancelSubScribe()
    {
        _paperBusiness.removeCustomer(this);
    }

    #endregion
}

接收者B

using System;
class Tom : customer
{
    private PaperBusiness _paperBusiness;
    public Tom(PaperBusiness paperBusiness)
    {
        _paperBusiness = paperBusiness;
        _paperBusiness.addCustomer(this);
    }
    #region customer 成员

    public void Noticy()
    {
        Console.WriteLine("Tom you must take you paper until 18:00 today.");
    }
    public void cancelSubScrib()
    {
        _paperBusiness.removeCustomer(this);
    }


    #endregion
}

接收者C

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

namespace ObserverPattern
{
    class Program
    {
        static void Main(string[] args)
        {
            PaperBusiness paperBusiness = new ChinaPaperBusiness();
            Jim jim = new Jim(paperBusiness);
            Tom tom = new Tom(paperBusiness);
            Lucy lucy = new Lucy(paperBusiness);
            paperBusiness.NoticeCustomer();
            jim.cancelSubScribe();
            Console.WriteLine();
            paperBusiness.NoticeCustomer();
            Console.ReadKey();
        }
    }
}

代码调用者