[Ironruby-core] Could you please teach a canonical style for writing the IronRuby hosting code.

はしもとけんいち ken1hasimoto at gmail.com
Tue Dec 1 09:43:25 EST 2009

Hello Jimmy-sann

Thank you for your some advice about my code,
and for giving me an information about the link to documentation of DLR-hosting.

I understood your advices as below:

1. for creating the engine.
If the program hosts the ONLY IronRuby, 'IronRuby.Ruby.CreateEngine()'
is better than 'runtime.GetEngine("rb");'.
If the program needs to host many dynamic languages, 'var engine =
ScriptRuntime.CreateFromConfiguration().GetEngine("rb");' is better
than 'IronRuby.Ruby.CreateEngine()'.

2. ScriptSource
If the program evaluates same script and never execute same script,
'engine.Execute(string, ScriptScope)' is better than for creating the
Because, engine.Execute(string, ScriptScope) is simple code.

If the program evaluates one script many times, for creating the
ScriptSource is better than 'engine.Execute(string, ScriptScope)'.
Because creating a ScriptSource compiles a ruby code ONLY once time
and reduces .
Of course, when creating a ScriptSource, I can change the mode for


Now, I have one more question about  global variables.
First, in my last mail, I used
'IronRuby.Ruby.GetExecutionContext(engine).DefineGlobalVariable' for
defining  global variable.
Now I found the way to write 'runtime.Globals.SetVariable("xxx",
567);' to define  global variable in the documentaion , but it seems
NOT work.
Is this a bug?

Thank you.

2009/11/30 Jimmy Schementi <Jimmy.Schementi at microsoft.com>:
> That looks good for hosting code that can switch between languages
> easily. If you're just using Ruby, you can use
> IronRuby.Ruby.CreateEngine() instead of getting the engine by string,
> but I'd suggest staying with what you have; you can change to other
> languages easily.
> For running code from strings, you don't necessarily need to create a
> ScriptSource; you can use engine.Execute(string, ScriptScope) instead.
> Creating a script source are for the cases where you want to compile
> the code and store it before executing, or you want to change the mode
> of source code execution (file, interactive, expressions, etc).
> There is a dlr hosting spec on dlr.codeplex.com that shows various
> hosting scenarios and how the code should look.
> Let us know if you have any other questions about hosting. I showed
> hosting at RubyConf this year, so keep an eye out for that blog post
> (I'll send mail to this list when it's done).
> ~Jimmy
> Sent from my phone
> On Nov 29, 2009, at 9:11 AM, "はしもとけんいち"
> <ken1hasimoto at gmail.com> wrote:
>> Hello, I'm kenichi hashimoto.
>> I'm a Japanese. I don't write english well.
>> Now I have a question about a canonical style for writing the IronRuby
>> hosting code.
>> Now, I'm tring to host the IronRuby 1.0RC on C#.NET (Visual Studio
>> 2008).
>> And, I have been trying to host it since IronRuby 0.5.
>> However, I haven't understood about how to write code in right style
>> yet.
>> Could you please teach a canonical style for writing the IronRuby
>> hosting code.
>> Now, I wrote below:
>>    static void Main(string[] args)
>>    {
>>        // create the IronRuby engine.
>>        ScriptRuntime runtime = IronRuby.Ruby.CreateRuntime();
>>        var engine = runtime.GetEngine("rb");
>>        // create the scope and set the local variable from C#
>>        var scope = engine.CreateScope();
>>        scope.SetVariable("x", 123);
>>        // set the global variable from C#
>>        IronRuby.Ruby.GetExecutionContext(engine).DefineGlobalVariable
>> ("xxx",
>> 789);
>>        // execute the script with the scope
>>        var source = engine.CreateScriptSourceFromString(@"puts ""x is
>> #{x}. $xxx is #{$xxx}."" ");
>>        source.Execute(scope);
>>        Console.ReadLine();
>>    }
>> Is it a canonical style?
>> Thank you.
>> B.R. Kenichi HASHIMOTO
>> _______________________________________________
>> Ironruby-core mailing list
>> Ironruby-core at rubyforge.org
>> http://rubyforge.org/mailman/listinfo/ironruby-core
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