A while ago there were the methods getitem and setitem which allowed to override an indexer.
I can't find these methods anymore and I also can't find a way to override an indexer.
 
namespace ClrModels {
 

public class IndexerContained{

 

    private Dictionary<string, string> _inner = new Dictionary<string, string>{
        { "key1", "value1" },
        { "key2", "value2" },
        { "key3", "value3" },
        { "key4", "value4" }
    };

 

    public virtual string this[string name]{
      get { return _inner[name]; }
      set { _inner[name] = value; }
    }
}

 

public class IndexerCaller{

 

    public string CallIndexOnClass(IndexerContained klass, string name){
        return klass[name];
    }

 

    public string CallIndexOnInterface(IHaveAnIndexer klass, string name){
        return klass[name];
    }

 

}

}
 
class MySubIndexer < ClrModels::IndexerContained;
def ; 6; end;
def Item(name); 7; end;
def item(name); 8; end;
def get_Item(name); 9; end;
end
 

cons = ClrModels::IndexerCaller.new
=> ClrModels.IndexerCaller
cons.call_index_on_class(MySubIndexer.new, "key")
unknown:0: warning: do not use Fixnums as Symbols
=> 'Fail'
 
 
And a spec to go with it:
 
require File.dirname(FILE) + "/../spec_helper"
 
describe "CLR to CLR interactions" do
 
describe "when isolating CLR classes" do
 

describe "that have an indexer" do
  before do
    @cons = ClrModels::IndexerCaller.new
    @ind = Caricature::Isolation.for(ClrModels::IndexerContained)
  end

 

  it "should work without expectations" do
    @cons.call_index_on_class(@ind, "key1").should.be.nil
  end

 

  it "should work with an expectation" do
    @ind.when_receiving(:__getitem__).return("5")

    @cons.call_index_on_class(@ind, "key1").should.equal "5"
  end

 
 

end

 
end
 
end

def [](name); '6'; end;