如何在没有继承的情况下从另一个类获取值属性

本文关键字：另一个 获取 属性 情况下 继承 | 更新日期: 2023-09-27 18:03:27

我有类:

public class Employee{
 public int Id {get;set;}
 public string Firstname {get;set;}
}
public class Person
{
   //get value Firstname property from Employee class
     Employee emp = new Employee();
     foreach(var s in emp)
     {
       Console.WriteLine(s.Firstname.ToList());
     }
}

所以，我想从Person类中获得属性ex: Firstname的值。

(我是c#新手)

我该怎么做呢?

如何在没有继承的情况下从另一个类获取值属性

您可以使用聚合(当Employee知道Person并且没有它就无法操作时)。示例:

public class Employee
{    
   public int Id {get;set;}
   public string Firstname => Person.FirstName;
   public Person Person {get;private set;}
   // this ctor is set to private to prevent construction of object with default constructor
   private Employee() {}
   public Employee(Person person) 
   { 
       this.Person = person;
   }
}
public class Person
{
   // We add property to Person as it's more generic class than Employee
   public string Firstname {get;set;}
}

要创建Employee，可以使用以下代码:

var jon = new Person { FirstName = "Jon" };
var employee = new Employee(jon);
Console.WriteLine(employee.FirstName); // OR
Console.WriteLine(employee.Person.FirstName);

你的FirstName属性是一个字符串类型，所以你不能通过foreach循环对它进行交互，你只能通过这种方式访问它

public class Employee{
 public int Id {get;set;}
 public string Firstname {get;set;}
 public Employee(string name)
 {
   this.Firstname = name;
 }
}
public class Person
{
   Employee emp = new Employee("Foo");
   string s = emp.Firstname;
}
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