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C# - 聚合

在C#中，Aggregation聚合是一个类将另一个类定义为任何实体引用的过程。这是重用类的另一种方式。它是代表HAS-A关系的一种关联形式。

C#聚合示例

让无涯教程看一个聚合示例，其中Employee类将Address类的引用作为数据成员。这样，它就可以重用Address类的成员。

using System;
public class Address
{
    public string addressLine, city, state;
    public Address(string addressLine, string city, string state)
    {
        this.addressLine = addressLine;
        this.city = city;
        this.state = state;
    }
}
   public class Employee
    {
       public int id;
       public string name;
       public Address address;//Employee HAS-A Address
       public Employee(int id, string name, Address address)
       {
           this.id = id;
           this.name = name;
           this.address = address;
       }
       public void display()
       {
           Console.WriteLine(id + " " + name + " " + 
             address.addressLine + " " + address.city + " " + address.state);
       }
   }
   public class TestAggregation
   {
        public static void Main(string[] args)
        {
            Address a1=new Address("G-13, Sec-3","Noida","UP");
            Employee e1 = new Employee(1,"Sonoo",a1);
            e1.display();
        }
    }