C#中的委托实现租房

来源：互联网发布：游戏优化器哪个最好用编辑：程序博客网时间：2024/05/03 19:50

//House类

public class House
   {
   public HouseType RoomType { get; set; }
   public double Rent { get; set; }
   public House(HouseType houseType, double rent)
   {
   this.RoomType = houseType;
   this.Rent = rent;
   }
   }

// HouseType类

public enum HouseType
   {
   OneBedroom,TwoBedroom,ThreeBedroom,FourBedroom
   }

第一步：定义委托类型

Agency类

   //1.定义委托类型
   public delegate void LetAgencyToFindHouse(HouseType houseType, double rent);

   public class Agency
   {
   public string Name { get; set; }
   private List<House> houselist = new List<House>();

   public Agency(string name)
   {
   this.Name = name;
   House h1 = new House(HouseType.OneBedroom, 500);
   House h2 = new House(HouseType.TwoBedroom, 700);
   House h3 = new House(HouseType.ThreeBedroom, 1000);
   House h4 = new House(HouseType.FourBedroom, 1500);
   this.houselist.Add(h1);
   this.houselist.Add(h2);
   this.houselist.Add(h3);
   this.houselist.Add(h4);
   }

   public void FindHouse(HouseType hopeType,double hopeRent)
   {
   Console.WriteLine("\n中介{0}开始找房子...",this .Name);
   House result = null;
   foreach (House h in this.houselist)
   {
   if (h.RoomType == hopeType && h.Rent<= hopeRent)
   {
   result = h;
   }
   }
   if (result == null)
   {
   Console.WriteLine("\n对不起！暂时没有你想要的房源！");
   }
   else
   {
   Console.WriteLine("\n找到了你期望的房子：类型：{0}，月租金为：{1}",result.RoomType,result.Rent);
   }
   }
   }

第二步：定义委托对象

Customer类

public class Customer
   {
   //2.定义委托对象
   public LetAgencyToFindHouse agencyDelegate;

   public string Name { get; set; }
   public HouseType RoomType { get; set; }
   public double Rent { get; set; }

   public void ToRentHouse()
   {
   Console.WriteLine("\n顾客{0}说，我要找一个{1}类型，月租金不高于{2}元的房子！",this.Name,this.RoomType ,this.Rent);
   // 4.调用委托
   agencyDelegate(this.RoomType, this.Rent);
   }
   }

第三步：把与委托有相同方法签名的方法绑定到对象上

程序入口Main方法

class Program
   {
   static void Main(string[] args)
   {
   Customer jayChou = new Customer();
   jayChou.Name = "周杰伦";
   jayChou.RoomType = HouseType.FourBedroom;
   jayChou.Rent = 1000;

   Agency one = new Agency("我爱我家");
   Agency two = new Agency("北大方正");
   // 3.把方法绑定到委托上
   jayChou.agencyDelegate = new LetAgencyToFindHouse(one.FindHouse);
   jayChou.agencyDelegate += new LetAgencyToFindHouse(two.FindHouse);
   jayChou.ToRentHouse();

   Console.WriteLine("\n第一家中介公司态度不好！我只要第二家帮我找...我可以出高点价格！");

   jayChou.Rent = 2000;

   jayChou.agencyDelegate -= new LetAgencyToFindHouse(one.FindHouse);
   jayChou.ToRentHouse();

   Console.ReadLine();
   }
   }

第四步：调用委托