如何在基类中创建对象的克隆？ [英] How do I create clone of object in base class?

问题描述

我需要一个在基类中创建对象的空克隆的方法吗？例如：

I need a method that creates an empty clone of an object in a base class? For instance:

public class ChildClass : ParentClass
{
   public ChildClass()
   {
   }
}
public class ParentClass
{
  public SomeMethod()
  {
     // I want to create an instance of the ChildClass here
  }
}

到目前为止，我们已经定义了一个抽象方法在父类中。并且，所有子类都实现它们。但是，所有实现都是相同的，只是一种不同的类型。

Up until now, we have an abstract method defined in the parent class. And, all of the child classes implement them. But, the implementation is the same for all, just a different type.

public class ChildClass : ParentClass
{
   public ChildClass()
   {
   }
   public ParentClass CreateEmpty()
   {
      return new ChildClass();
   }
}
public class ParentClass
{
  public SomeMethod()
  {
     // I want to create an instance of the ChildClass here
     ParentClass empty = CreateEmpty();

  }
  public abstract ParentClass CreateEmpty();
}

有什么方法可以从父类这样做，这样我就不会必须为每个不同的子类继续实现相同的逻辑吗？请注意，可能有更多级别的继承（即ChildChildClass：ChildClass：ParentClass）。

Is there any way to do this from the parent class so that I don't have to keep implementing the same logic for each different child class? Note that there may be more levels of inheritance (i.e. ChildChildClass : ChildClass : ParentClass).

推荐答案

如果使用反射不是问题，你可以使用Activator类来做：

If using reflection isn't a problem to you, you could do it using Activator class:

//In parent class
public ParentClass CreateEmpty()
{
    return (ParentClass)Activator.CreateInstance(this.GetType());
}

这将返回所需类型的空对象。请注意，此方法不需要是虚拟的。

This will return empty object of the type you want. Notice that this method does not need to be virtual.

另一方面，我认为您当前的方法非常好，几行代码也不是那么糟糕。

On the other hand, I think that your current approach is perfectly fine, few more lines of code aren't so bad.

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