# How do I pass an ExpandoObject from C# into IronRuby?

**URL:** <https://www.ruby-forum.com/t/how-do-i-pass-an-expandoobject-from-c-into-ironruby/184478>\
**Category:** IronRuby\
**Created:** [March 3, 2010, 8:21am UTC](https://www.ruby-forum.com/t/how-do-i-pass-an-expandoobject-from-c-into-ironruby/184478 "2010-03-03T08:21:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![GoodeS\_Troy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ea666f/32.png) [@GoodeS\_Troy](https://www.ruby-forum.com/u/GoodeS_Troy)\
**Post date:** [March 3, 2010, 8:21am UTC](https://www.ruby-forum.com/t/how-do-i-pass-an-expandoobject-from-c-into-ironruby/184478/1 "2010-03-03T08:21:28Z")

</div>

I tried to send this question earlier, but it did not appear to go  
through. Shortly after I tried to send it the first time, the “Consuming  
DynamicObjects in IronRuby” thread popped up. It seems likely that the  
two issues are related, but as my situation is a bit different and  
results in a different error message, I thought it would be a good idea  
to resend this question. Note: I am using .Net 4.0 RC and the “CTP for  
.Net 4.0 RC” release of IronRuby…

So I’m finally getting around to testing IronRuby/C# integration and hit  
a stumbling block. Let’s say I have the following class in Ruby:

class HandleMoveRequested

```
            def handle(msg)

                            System::Console.WriteLine "Moving 

```

character to " + msg.x.to\_s + “,” + msg.y.to\_s + “.”

```
            end

```

end

As you can see it is a simple message handler that expects an object  
that has an “x” and a “y” property. Now say I have the following C#  
code:

dynamic handler = ruby.HandleMoveRequested.@new();

dynamic msg = new ExpandoObject();

msg.x = 1;

msg.y = 2;

handler.handle(msg);

Creating the handler instance works fine, so I won’t bore you with the  
details of that, but for some reason the last line throws an  
InvalidOperationException with the message “unbound variable: value”.  
Everything works if the message is a Ruby class that I create manually,  
but I’d love to be able to just create a fully dynamic object (such as  
the ExpandoObject) here and pass it in. Is this just not possible?

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---

<div class="post-metadata">

**Author:** ![GoodeS\_Troy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ea666f/32.png) [@GoodeS\_Troy](https://www.ruby-forum.com/u/GoodeS_Troy)\
**Post date:** [March 3, 2010, 8:24pm UTC](https://www.ruby-forum.com/t/how-do-i-pass-an-expandoobject-from-c-into-ironruby/184478/2 "2010-03-03T20:24:25Z")

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Answered your question over on StackOverflow:

> <https://stackoverflow.com/questions/2365668/how-do-i-pass-an-expandoobject-from-c-into-ironruby>

[http://stackoverflow.com/questions/2365668/how-do-i-pass-an-expandoobject-from-c-into-ironruby/](http://stackoverflow.com/questions/2365668/how-do-i-pass-an-expandoobject-from-c-into-ironruby/)Essentially,  
Tomas fixed this, and if you build from source now, your code will work.  
Thanks  
Best Regards,  
Kevin R.