[IronPython] DLR Hosting, Access to .NET Types

David Seruyange idmkid at yahoo.com
Fri Apr 18 06:28:28 CEST 2008

I think I follow you but I think I can be more specific in getting at what sems to be a subtlety. If you have the following (a file e.g. Spam.py):

import clr
from System.Text import *

s = StringBuilder()
print "okay"

It works just fine when executed from a command shell using ipy (ipy Spam.py).  The assumption is that mscorlib is loaded because of the clr.AddReference("System"). 
But when using a hosted engine, mscorlib seems not to be loaded for free anymore - 

ScriptEngine engine = PythonEngine.CurrentEngine;

Now the reference that came for "free" before to mscorlib seems not to be present.

----- Original Message ----
From: Curt Hagenlocher <curt at hagenlocher.org>
To: Discussion of IronPython <users at lists.ironpython.com>
Sent: Thursday, April 17, 2008 10:39:49 PM
Subject: Re: [IronPython] DLR Hosting, Access to .NET Types

On Thu, Apr 17, 2008 at 8:33 PM, David Seruyange <idmkid at yahoo.com> wrote:
> Are all framework types accessible from a hosted engine?  While the module
> loads fine using the above code, a reference to the StringBuilder (which
> works fine when executing a file that references the module) produces an
> error "name StringBuilder not defined." (The module does have a "from
> System.Text import *") -

The console does the equivalent of the following:


You'll need to execute similar code if you want to access the same assemblies

Curt Hagenlocher
curt at hagenlocher.org
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Users at lists.ironpython.com

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