//软件
  public interface ISoftWare
  {
    void start();
  }

  //Kuwo
  public class Kuwo : ISoftWare
  {
    public void start()
    {
      Console.WriteLine("听音乐，用酷我！");
    }
  }
  //WeiXin
  public class WeiXin : ISoftWare
  {
    public void start()
    {
      Console.WriteLine("让你我的距离更近！");
    }
  }

  //操作系统，跑软件
  public abstract class System
  {
    public abstract void Run(ISoftWare software);
  }

  //Wp
  public class WinPhone : System
  {
    public override void Run(ISoftWare software)
    {
      Console.WriteLine("Winphone系统，给你想要的;");
      software.start();
    }
  }

  //Ios
  public class Ios : System
  {
    public override void Run(ISoftWare software)
    {
      Console.WriteLine("Ios系统，给你想不到的;");
      software.start();
    }
  }

public static void Main()
    {
      ISoftWare weixin = new WeiXin();
      ISoftWare kuwo = new Kuwo();
      //Wp系统
      System WpSys = new WinPhone();
      WpSys.Run(weixin);
      WpSys.Run(kuwo);
      //IOS系统
      System IosSys = new Ios();
      IosSys.Run(weixin);
      IosSys.Run(kuwo);

      Console.Read();
    }

// 客户端调用
  // 类似Web应用程序
  class Client
  {
    static void Main(string[] args)
    {
      BusinessObject customers = new CustomersBusinessObject("ShangHai");
      customers.Dataacces = new CustomersDataAccess();
      customers.Add("小六");
      Console.WriteLine("增加了一位成员的结果：");
      customers.ShowAll();
      customers.Delete("王五");
      Console.WriteLine("删除了一位成员的结果：");
      customers.ShowAll();
      Console.WriteLine("更新了一位成员的结果：");
      customers.Update("Learning_Hard");
      customers.ShowAll();
      Console.Read();
    }
  }
  // BLL 层
  public class BusinessObject
  {
    // 字段
    private DataAccess dataacess;
    private string city;
    public BusinessObject(string city)
    {
      this.city = city;
    }
    // 属性
    public DataAccess Dataacces
    {
      get { return dataacess; }
      set { dataacess = value; }
    }
    // 方法
    public virtual void Add(string name)
    {
      Dataacces.AddRecord(name);
    }
    public virtual void Delete(string name)
    {
      Dataacces.DeleteRecord(name);
    }
    public virtual void Update(string name)
    {
      Dataacces.UpdateRecord(name);
    }
    public virtual string Get(int index)
    {
      return Dataacces.GetRecord(index);
    }
    public virtual void ShowAll()
    {
      Console.WriteLine();
      Console.WriteLine("{0}的顾客有：", city);
      Dataacces.ShowAllRecords();
    }
  }
  public class CustomersBusinessObject : BusinessObject
  {
    public CustomersBusinessObject(string city)
      : base(city) { }
    // 重写方法
    public override void ShowAll()
    {
      Console.WriteLine("------------------------");
      base.ShowAll();
      Console.WriteLine("------------------------");
    }
  }
  /// <summary>
  /// 相当于三层架构中数据访问层（DAL）
  /// </summary>
  public abstract class DataAccess
  {
    // 对记录的增删改查操作
    public abstract void AddRecord(string name);
    public abstract void DeleteRecord(string name);
    public abstract void UpdateRecord(string name);
    public abstract string GetRecord(int index);
    public abstract void ShowAllRecords();
  }
  public class CustomersDataAccess:DataAccess
  {
    // 字段
    private List<string> customers =new List<string>();
    public CustomersDataAccess()
    {
      // 实际业务中从数据库中读取数据再填充列表
      customers.Add("Learning Hard");
      customers.Add("张三");
      customers.Add("李四");
      customers.Add("王五");
    }
    // 重写方法
    public override void AddRecord(string name)
    {
      customers.Add(name);
    }
    public override void DeleteRecord(string name)
    {
      customers.Remove(name);
    }
    public override void UpdateRecord(string updatename)
    {
      customers[0] = updatename;
    }
    public override string GetRecord(int index)
    {
      return customers[index];
    }
    public override void ShowAllRecords()
    {
      foreach (string name in customers)
      {
        Console.WriteLine(" " + name);
      }
    }
       
  }