如何在C#中制作一个简单的动态代理 [英] How to make a simple dynamic proxy in C#

问题描述

我想构建一个动态代理对象来向对象添加某些功能.

I want to build a dynamic proxy object to add certain functionality to an object.

基本上我想接收一个对象，用一个看起来与我得到的原始对象相同的对象包装它，并拦截所有调用.

basically i want to receive an object, wrap it with an object that looks identical to the original i got, and intercept all the calls.

class Wrapper : DynamicProxy// dynamic proxy is not a reall class, but i guess something like this exists...
{
    public static T Wrap(T obj)
    {
        return (T) new Wrapper(obj);
    }

    public override object InterceptCall(MethodInfo info, object[] args)
    {
        // do stuff
    }

}

<小时>

澄清一下，我想做一些类似于 WCF 频道工厂的事情...

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Just to clarify, I want to do something similar to the WCF channel factory...

我正在添加赏金，因为我需要一种很好的方法来代理类(而不是接口)和处理非虚拟方法(就像我在new"关键字下继承并添加了一个方法一样).我确信这一切都是有可能的，因为 .Net 做到了.

I'm adding a bounty, because I need a good way to proxy classes (not interfaces) and to handle non virtual methods (as if I inherited and added a methond under the "new" keyword). I'm sure all this is very possible as the .Net does it.

推荐答案

我应该早点写这个，但没关系.

I should have written this sooner, but never mind.

我的问题有一个特殊的问题"，我需要能够代理类而不是接口.

My issue had a special "gotcha" I needed to be able to proxy classes and not interfaces.

有两种解决方案:

1. RealProxy 和朋友们，基本上是指使用.NET Remoting.需要从 ContextBoundObject 继承.

1. RealProxy and friends, basically means using .NET Remoting. Requires one to inherit from ContextBoundObject.

• 这种方法利用了 .NET JIT 编译器提供的魔法"(硬编码以专门识别RealProxy)让您覆盖"非虚拟成员.

使用 System.Reflection 构建代理.像 spring<所做的那样发出/a> 你也可以看看他们的的代码代理工厂对象.这是另外三个文章 在 主题.

Building a proxy using System.Reflection.Emit as done by spring you can also look at the code of their ProxyFactoryObject. Here are another three articles on the subject.

• 这种方法的主要缺点是限制您只能覆盖virtual 成员.

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