I don't think your code below will work as multiple Ruby types share the same
underlying CLR type. If you want to do things in a strongly-bound way, you
would need to use the RubyUtils and other runtime helpers to find the method
"new", invoke it, etc. instead of using System.Reflection.
An alternative is to just do an eval. Something like:
RubyUtils.Evaluate("raise JSONError", scope)
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Daniele Alessandri
Sent: Thursday, February 12, 2009 11:59 PM
To: [email protected]
Subject: Re: [Ironruby-core] Throwing Exceptions defined in Ruby from C#
Yes it is meant to be used primarily from ruby as it is a port of a
rather widespread library, and a dependency for a bunch of other
libraries (see http://json.rubyforge.org/).
The reason is simply to maintain compatibility with the ruby bits of
the original json library in which exceptions are defined inside a
common.rb file: this is due to the fact that this lib comes in two
flavours, json-pure (everything is ruby) and json-ext (the generator
and parser are implemented in C, the rest is ruby), so there are parts
of the code that are shared between the two and eventually invoked
from within the native code.
Anyway I'm curious, I haven't found other means to do that in a much
cleaner way :)
On Fri, Feb 13, 2009 at 04:33, Tomas Matousek
<[email protected]> wrote:
> Why don't you declare the exceptions in C#? I assume the library is primarily
> to be used from Ruby code, not from C#, right?
>
> Tomas
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Daniele Alessandri
> Sent: Thursday, February 12, 2009 6:31 AM
> To: [email protected]
> Subject: [Ironruby-core] Throwing Exceptions defined in Ruby from C#
>
> Hi,
>
> I'm refactoring and polishing the source code of my port of json/ext
> to IronRuby (it's feature complete by now) but I'm wondering if there
> is a better way to throw an Exception defined in ruby from C# compared
> to the only solution I've came up with so far. Here is the code I'm
> using right now, stripped down of checks and condensed in one method
> just for the sake of brevity:
>
> ----- ruby -----
>
> module JSON
> class JSONError < StandardError; end
> class ParserError < JSONError; end
> end
>
> ----- C# -----
>
> public static void RaiseParserError(RubyScope scope, String msg) {
> RubyModule eParserError;
>
> scope.RubyContext.TryGetModule(scope.GlobalScope,
> "JSON::ParserError",
> out eParserError
> );
>
> RubyClass exceptionClass = eParserError as RubyClass;
> Type underlyingType = exceptionClass.GetUnderlyingSystemType();
>
> BindingFlags bindingFlags = BindingFlags.NonPublic |
> BindingFlags.Public |
> BindingFlags.Instance;
>
> ConstructorInfo constructor = underlyingType.GetConstructor(
> bindingFlags,
> null,
> new[] { typeof(RubyClass), typeof(String) },
> null
> );
>
> Exception exceptionInstance = constructor.Invoke(
> new object[] { exceptionClass, msg }
> ) as Exception;
>
> throw exceptionInstance;
> }
>
>
> --
> Daniele Alessandri
> http://www.clorophilla.net/blog/
> _______________________________________________
> Ironruby-core mailing list
> [email protected]
> http://rubyforge.org/mailman/listinfo/ironruby-core
>
> _______________________________________________
> Ironruby-core mailing list
> [email protected]
> http://rubyforge.org/mailman/listinfo/ironruby-core
>
--
Daniele Alessandri
http://www.clorophilla.net/blog/
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