[Ironruby-core] Implementing get_Item in Ruby for access in .NET

Curt Hagenlocher curth at microsoft.com
Wed Apr 29 11:37:37 EDT 2009

I don't think there's any attempt right now to identify an indexer when overriding virtual methods.  This means that the normal Rubification rules kick in and you get

def item key
def item= key, value

The second of these, of course, isn't usable from within Ruby -- though I think it should still work correctly when called by C# through the interface.

Obviously, this should be entered as a work item on Codeplex if it isn't there already.

-----Original Message-----
From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at rubyforge.org] On Behalf Of Xerxes Battiwalla
Sent: Wednesday, April 29, 2009 5:05 AM
To: ironruby-core at rubyforge.org
Subject: [Ironruby-core] Implementing get_Item in Ruby for access in .NET

Hi there.

We're trying to access a ruby implementation of a Hash from .NET but
having trouble getting the following snip to work

require 'Dependencies.dll'
class ParameterList
       include Namespace::IParameterList


       def initialize
               @parameter_hash = Hash.new

       def []= key, value
               @parameter_hash[key] = value

       def [] key

       def get_Item key

and on the .NET side:

public interface IParameterList : IEnumerable
   int Count { get; }
   IParameter this[string name] { get; }
   IParameter this[int index] { get; }
   IEnumerator GetEnumerator();
   event ParameterValueChangedEventHandler OnParameterValueChanged;

When we call it from .NET with the following code (The parameters
object is an instance of the Ruby ParamterList class ):
parameter = parameters["Key"];

The error returned is
NoMethodError: undefined method `get_Item' for #<ParameterList:0x0000104>

Is it possible to have a Ruby object with an indexer which is callable from C#?

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