C＃重写/添加方法/字段对象 [英] C# override/add methods/fields to an object

问题描述

我有一个创建和设置对象我，然后我就可以使用这些对象做的东西的库。

比方说我在给定对象一 A级的

所以我要覆盖一个方法的具体的对象，我不想改变代码的。类，因为这需要更改库

在Ruby的我能做到这一点使用单实例类，如：

 类的Firstclass 
高清测试
P测试
端
端
 $ b $ =博FirstClass.new 
 
类<< Ø
高清测试
P重写
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 DEF extraMethod 
POK
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 o.test＃打印覆盖
 o.extraMethod 
  

现在我该怎么做在C＃一样的吗？

更新

我结束了不使用回答我提交因为它太丑陋，它需要改变所有的私人领域在基类要么保护或公众，使他们在派生类中存在，因此我可以从基本的值复制到的。

我最终使用是通过从基类派生到库的类型，并更改库，以便它使用创建实例的方式：

 （A）Activator.CreateInstance（MYTYPE，参数）; 
  

解决方案

C＃不（直接）支持运行时间延长类型，不是通过动态机制等。

最接近的选项很可能会使用 ExpandoObject 与动态：

 动态O =新ExpandoObject（）; 
 o.a = 10; 
 
 o.ExtraMethod =新动作（（）=> Console.WriteLine（确定））; 
 
 //调用
 o.ExtraMethod（）; 
  

话虽这么说，这不是用C＃工作的典型方式。

I have a library that creates and setups objects for me, then I can use those objects to do stuff.

Let's say I'm given object "a" of class "A"

So I want to override a method in that specific object, I don't want to change the code of its class because that would require changing the library.

In Ruby I can do that using Singleton Classes, like:

class FirstClass
    def test
        p "test"
    end
end

o = FirstClass.new

class << o
    def test
        p "overridden"
    end
    def extraMethod
        p "ok"
    end
end

o.test # prints "overridden"
o.extraMethod

Now how can I do the same in C#?

Update

I ended up not using the answer I submitted because it's too ugly and it requires changing all private fields in the base class to either protect or public to make them exist in the derived class hence I can copy values from base to derived.

The way I ended up using is to pass a Type derived from the base class to the library and change the library so that it creates instances using:

(A)Activator.CreateInstance(mytype, arguments);

解决方案

C# doesn't (directly) support runtime extension of types, other than via the dynamic mechanisms.

The closest option would likely be to use ExpandoObject with dynamic:

dynamic o = new ExpandoObject();
o.a = 10;

o.ExtraMethod = new Action( () => Console.WriteLine("ok") );

// Invoke
o.ExtraMethod();

That being said, this is not a typical way to work with C#.

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