铸造基地例如在C＃中派生类（垂头丧气） [英] Cast base instance to derived class (downcast) in C#

问题描述

假如我有两个类：

 类Employee 
  

和

 类AdvancedEmployee：员工
  

我知道这样的事情是行不通的，因为我不能垂头丧气C＃的：

  VAR员工=新员工（）; 
无功先进=员工为AdvancedEmployee; 
  

我的问题是：如何在有效的方式完成垂头丧气？
其实我有AdvancedEmployee一个构造函数劳动者作为参数，并用它来注入自己的价值观，基本上做一个克隆。

---

更新

要解决会得到重复，我改变了做法了一下数据，现在AdvancedEmployee包含一个雇员，而不是为一种本身。
示例：

 类员工; 
 
类AdvancedEmployee 
 {
私人员工
 
公共AdvancedEmployee（员工员工）{
 
 this.employee = $员工b 
 $ b} 
 
} 
  

解决方案

创建界面。既然你不能修改员工，创建一个适配器您拥有：

 类EmployeeAdapter：IEmployee 
 {
私人雇员EMP; 
公共EmployeeAdapter（员工EMP）{this.emp = EMP; } 
公众诠释SomeMethodInEmployee（）{返回emp.SomeMethodInEmployee（）; } 
} 
 
类AdvancedEmployee：IEmployee {} 
  

Suppose I have two classes:

class Employee 

and

class AdvancedEmployee:Employee

I know something like this won't work, as I can't downcast on C#:

var employee = new Employee();
var advanced = employee as AdvancedEmployee;

My question is: How to accomplish downcast in a efficient way? Actually I have a constructor on AdvancedEmployee that takes a Employee as parameter and use it to inject its values, basically making a clone.

---

Update

To solve the data that would get duplicated I changed the approach a bit and now AdvancedEmployee CONTAINS an employee rather than being one itself. Example:

class Employee;

class AdvancedEmployee
{
   private employee

   public AdvancedEmployee(Employee employee){

    this.employee = employee

  }           

}

解决方案

Create an interface. And since you can't modify Employee, create an adapter that you own:

class EmployeeAdapter : IEmployee
{
    private Employee emp;
    public EmployeeAdapter(Employee emp) { this.emp = emp; }
    public int SomeMethodInEmployee() { return emp.SomeMethodInEmployee(); }
}

class AdvancedEmployee : IEmployee { } 

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