AppDomain.CreateInstanceFromAndUnwrap - 无法施展透明代理 [英] AppDomain.CreateInstanceFromAndUnwrap - Unable to cast transparent proxy

问题描述

我正在写一个.NET库注入DLL的管理到外部进程。我目前的做法是：

I'm writing a .NET library to inject managed DLLs into external processes. My current approach is:

1. 使用远程线程来强制目标进程调用调用LoadLibrary 在非托管引导DLL。从这一点我们在目标进程中执行代码。


2. 我的引导DLL然后创建CLR和调​​用的实例 ExecuteInDefaultAppDomain 就可以了，它执行的管理助手DLL的方法。


3. 此方法创建一个新的AppDomain，并呼吁 AppDomain.CreateInstanceFromAndUnwrap 传递执行了我的负载DLL，铸造结果为 IInjectionPayload 。


4. 的想法是，我的有效载荷DLL公开它实现了一个类 IInjectionPayload ，所以助手DLL可以简单地调用 payload.Run（）。

1. Use CreateRemoteThread to force the target process to call LoadLibrary on an unmanaged bootstrap DLL. From this point we're executing code in the target process.
2. My bootstrap DLL then creates an instance of the CLR and calls ExecuteInDefaultAppDomain on it, which executes a method in a managed helper DLL.
3. This method creates a new AppDomain and calls AppDomain.CreateInstanceFromAndUnwrap to pass execution into my payload DLL, casting the result as an IInjectionPayload.
4. The idea is that my payload DLL exposes a class which implements IInjectionPayload, so the helper DLL can simply call payload.Run().

我在做这种方式通过 AppDomain.Unload （后简单地调用，使有效载荷的代码可以完全卸载。信令它来清理）

I'm doing it this way so that the payload code can be completely unloaded by simply calling AppDomain.Unload (after signalling it to clean up).

本方法适用 - 在我载荷DLL类是越来越实例化目标的过程，所以代码的可以的执行 - 但我不能投用 CreateInstanceFromAndUnwrap 返回到对象的 IInjectionPayload ;它抛出以下异常：

This approach works - the class in my payload DLL is getting instantiated in the target process, so code can be executed - but I can't cast the object returned by CreateInstanceFromAndUnwrap to an IInjectionPayload; it throws the following exception:

无法施展透明代理键入blah.Blah.IInjectionPayload

Unable to cast transparent proxy to type 'blah.Blah.IInjectionPayload'.

我试过使用 CreateInstanceAndUnwrap 和 Activator.CreateInstanceFrom 然后按 Object.Unwrap ，但是这两种方法也导致同样抛出异常。

I've tried using CreateInstanceAndUnwrap, and Activator.CreateInstanceFrom followed by Object.Unwrap, but both of these methods also cause the same exception to be thrown.

我的有效载荷类的签名是：

The signature of my payload class is:

公共类节目：MarshalByRefObject的，IInjectionPayload

我很为难，因为有效载荷DLL肯定是越来越加载和类被实例化，如预期。 。任何帮助将非常感激。

I'm stumped because the payload DLL is definitely getting loaded and the class is being instantiated, as intended. Any help would be much appreciated.

推荐答案

找到修复此问题在这里：的 http://www.west-wind.com/WebLog/posts/601200.aspx

Found the fix for this problem here: http://www.west-wind.com/WebLog/posts/601200.aspx

它看起来像在.NET框架的错误。该解决方案是一个处理程序添加到 AppDomain.CurrentDomain.AssemblyResolve 其中手动加载&安培;返回大会 args.Name 。然后，你可以调用 CreateInstanceFromAndUnwrap 没有它抛出一个异常。

It looks like a bug in the .NET framework. The solution is to add a handler to AppDomain.CurrentDomain.AssemblyResolve which manually loads & returns the assembly at args.Name. Then you can call CreateInstanceFromAndUnwrap without it throwing an exception.

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