# CLR interop bug?

**URL:** <https://www.ruby-forum.com/t/clr-interop-bug/169874>\
**Category:** IronRuby\
**Created:** [June 9, 2009, 9:28pm UTC](https://www.ruby-forum.com/t/clr-interop-bug/169874 "2009-06-09T21:28:59Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![barby](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/c57346/32.png) [@barby](https://www.ruby-forum.com/u/barby)\
**Post date:** [June 9, 2009, 9:28pm UTC](https://www.ruby-forum.com/t/clr-interop-bug/169874/1 "2009-06-09T21:28:59Z")

</div>

Hi  
What is the nitty gritty around monkey patching CLR classes. When I’m  
monkey  
patching I should be able to get to the protected members of a class  
right?  
And the private members too (I see it kind of like partial classes)?

public class AggregatorRepository :  
RepositoryBase  
{  
public  
AggregatorRepository(UnitOfWorkScopeBase  
unitOfWorkScope) : base(unitOfWorkScope)  
{  
}

```
//Some C# methods here that use Linq and Expressions for querying

```

}

Repository base defines a protected property UnitOfWorkScope

I monkey patched it like so

module MediaAggregator  
module Models  
module Lightspeed

```
  class AggregatorRepository

    def users
      uow.method(:find).of(User).call
    end

    def uow
      self.unit_of_work_scope.current
    end

  end
end

```

end  
end

Calling the users method result in an error complaining about a  
protected  
unit\_of\_work\_scope method. And ironically the error talks about my  
situation  
as being the solution:  
\*  
\*  
_C\*\*LR protected method `unit\_of\_work\_scope’ called for  
MediaAggregator.Models.Lightspeed.AggregatorRepository:MediaAggregator::Models::Lightspeed::AggregatorRepository;  
CLR protected methods can only be called with a receiver whose class is  
a  
subclass of the class declaring the method_

Do I put this on codeplex or am I reading the error wrong? As far as I  
can  
tell I am subclassing a class.

* * *

Met vriendelijke groeten - Best regards - Salutations  
Ivan Porto C.  
Blog: [http://flanders.co.nz](http://flanders.co.nz)  
Twitter: [http://twitter.com/casualjim](http://twitter.com/casualjim)  
Author of IronRuby in Action ([http://manning.com/carrero](http://manning.com/carrero))

---

<div class="post-metadata">

**Author:** ![barby](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/c57346/32.png) [@barby](https://www.ruby-forum.com/u/barby)\
**Post date:** [June 9, 2009, 10:04pm UTC](https://www.ruby-forum.com/t/clr-interop-bug/169874/2 "2009-06-09T22:04:13Z")

</div>

The error message might be more clear:

CLR protected method `unit\_of\_work\_scope’ called for  
MediaAggregator.Models.Lightspeed.AggregatorRepository:MediaAggregator::Models::Lightspeed::AggregatorRepository;  
CLR protected methods can only be called with a receiver whose class is  
a Ruby subclass of the class declaring the method

You need to derive a Ruby class from the CLR class and use its instance  
to call the method. What we need to do internally is emit a CLR subtype  
of the CLR type that proxies protected method calls coming from Ruby  
code. When you monkey-patch a CLR method it doesn’t mean you are “in the  
type”. You are still outside of the type, so you still have the same  
visibility restrictions on CLR members as if they were called from any  
other Ruby/CLR method. IronRuby just overlays Ruby methods over the CLR  
type, it cannot “open” the type.

Tomas

From: removed\_email\_address@domain.invalid  
[[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] On Behalf Of Ivan Porto  
Carrero  
Sent: Tuesday, June 09, 2009 12:28 PM  
To: ironruby-core  
Subject: [Ironruby-core] CLR interop bug?

Hi

What is the nitty gritty around monkey patching CLR classes. When I’m  
monkey patching I should be able to get to the protected members of a  
class right? And the private members too (I see it kind of like partial  
classes)?

public class AggregatorRepository :  
RepositoryBase  
{  
public  
AggregatorRepository(UnitOfWorkScopeBase  
unitOfWorkScope) : base(unitOfWorkScope)  
{  
}

```
//Some C# methods here that use Linq and Expressions for querying

```

}

Repository base defines a protected property UnitOfWorkScope

I monkey patched it like so

module MediaAggregator  
module Models  
module Lightspeed

```
  class AggregatorRepository

    def users
      uow.method(:find).of(User).call
    end

    def uow
      self.unit_of_work_scope.current
    end

  end
end

```

end  
end

Calling the users method result in an error complaining about a  
protected unit\_of\_work\_scope method. And ironically the error talks  
about my situation as being the solution:

CLR protected method `unit\_of\_work\_scope’ called for  
MediaAggregator.Models.Lightspeed.AggregatorRepository:MediaAggregator::Models::Lightspeed::AggregatorRepository;  
CLR protected methods can only be called with a receiver whose class is  
a subclass of the class declaring the method

Do I put this on codeplex or am I reading the error wrong? As far as I  
can tell I am subclassing a class.

* * *

Met vriendelijke groeten - Best regards - Salutations  
Ivan Porto C.  
Blog: [http://flanders.co.nz](http://flanders.co.nz)  
Twitter: [http://twitter.com/casualjim](http://twitter.com/casualjim)  
Author of IronRuby in Action ([http://manning.com/carrero](http://manning.com/carrero))