从父对象创建子对象实例的最佳方法 [英] Best way to create instance of child object from parent object

问题描述

我正在从父对象创建子对象。所以场景是我有一个对象和一个子对象，它为我想要搜索的场景添加了一个距离属性。我选择使用继承，因为我的UI与搜索对象或对象列表等效地工作，而不是位置搜索的结果。所以在这种情况下，继承似乎是一个明智的选择。

I'm creating a child object from a parent object. So the scenario is that I have an object and a child object which adds a distance property for scenarios where I want to search. I've chosen to use inheritance as my UI works equivalently with either a search object or a list of objects not the result of a location search. So in this case inheritance seems a sensible choice.

现在我需要从 MyObject <的实例生成一个新对象 MyObjectSearch / code>。目前我通过逐个设置属性手动在构造函数中执行此操作。我可以使用反射，但这会很慢。有没有更好的方法来实现这种对象增强？

As present I need to generate a new object MyObjectSearch from an instance of MyObject. At present I'm doing this in the constructor manually by setting properties one by one. I could use reflection but this would be slow. Is there a better way of achieving this kind of object enhancement?

希望我的代码如下所示。

Hopefully my code below illustrates the scenario.

public class MyObject {

    // Some properties and a location.
}

public class MyObjectSearch : MyObject {

    public double Distance { get; set; }

    public MyObjectSearch(MyObject obj) {
         base.Prop1 = obj.Prop1;
         base.Prop2 = obj.Prop2;
    }
}

我的搜索功能：

public List<MyObjectSearch> DoSearch(Location loc) { 
  var myObjectSearchList = new List<MyObjectSearch>();       

   foreach (var object in myObjectList) {
       var distance = getDistance();
       var myObjectSearch = new MyObjectSearch(object);
       myObjectSearch.Distance = distance;
       myObjectSearchList.add(myObjectSearch);
   } 
   return myObjectSearchList;

}

推荐答案

基类需要定义一个复制构造函数：

The base class needs to define a copy constructor:

public class MyObject
{
    protected MyObject(MyObject other)
    {
        this.Prop1=other.Prop1;
        this.Prop2=other.Prop2;
    }

    public object Prop1 { get; set; }
    public object Prop2 { get; set; }
}

public class MyObjectSearch : MyObject
{

    public double Distance { get; set; }

    public MyObjectSearch(MyObject obj)
         : base(obj)
    {
        this.Distance=0;
    }
    public MyObjectSearch(MyObjectSearch other)
         : base(other)
    {
        this.Distance=other.Distance;
    }
}

这样就可以处理所有派生的属性设置基类的类。

This way the setting of properties is handled for all derived classes by the base class.

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