与同类型的现有对象创建一个类的实例 [英] Creating an instance of a class with the same type as an existing object

问题描述

我想根据作为简单类型层次结构一部分的另一个实例的类型来实例化一个类的实例。

I would like to instantiate an instance of a class based on the type of another instance that is part of a simple type hierarchy.

public abstract class Base
{
}

public class Derived1 : Base
{
}

public class Derived2 : Base
{
}

Base d1 = new Derived1();

Base d2;

if (d1 is Derived1)
{
    d2 = new Derived1();
}
else if (d1 is Derived2)
{
    d2 = new Derived2();
}

但是，如果没有如果... else if ... chain by（例如）使用反射来获得 d1 并且使用它来实例化 d1 的另一个实例可能是？

However, is it possible to achieve this without an if...else if... chain by (for example) using reflection to get hold of the constructor of d1 (in my example) and using it to instantiate another instance of whatever type d1 might happen to be?

推荐答案

d2 = (Base)Activator.CreateInstance(d1.GetType());

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