[IronPython] Specified language provider type is not registered.

Tomas Matousek Tomas.Matousek at microsoft.com
Wed Sep 3 01:45:43 CEST 2008

Right. That's expected behavior. The exception is caught there, isn't it?
DLR can be tweaked so that it dumps debugging information about generated IL, trees, etc. Compiler developers building their own language on top of DLR might want to use DLR_* options while debugging their compilers to get useful information out of DLR.


From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of KE
Sent: Tuesday, September 02, 2008 3:34 PM
To: Tomas Matousek; 'Discussion of IronPython'
Subject: Re: [IronPython] Specified language provider type is not registered.

Oh D'uh, Thanks!

It got further now, but I had built the binaries in Debug mode and there was an Environment permission exception in:

internal static class DebugOptions {
        private static string ReadDebugString(string name) {
            try {
                return Environment.GetEnvironmentVariable("DLR_" + name);

Of course, I will go back and build in Release mode, but I thought it's something you should know - the assembly acts differently in partial trust based on the type of release mode.

From: Tomas Matousek [mailto:Tomas.Matousek at microsoft.com]
Sent: Tuesday, September 02, 2008 12:25 PM
To: Discussion of IronPython; hellosticky at gmail.com
Subject: RE: [IronPython] Specified language provider type is not registered.

The problem in your code is that you update "setup" variable after it is passed to ScriptRuntime. You need to first initialize the setup and then pass it to runtime ctor (the ctor uses the setup object to create and configure DLR and once that done no changes are possible).

ScriptRuntime runtime = new ScriptRuntime(setup);
Does this work?


From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Curt Hagenlocher
Sent: Monday, September 01, 2008 10:26 PM
To: hellosticky at gmail.com; Discussion of IronPython
Subject: Re: [IronPython] Specified language provider type is not registered.

Get the ScriptEngine directly from IronPython.Hosting.Python instead of going through the runtime.
On Mon, Sep 1, 2008 at 10:19 PM, KE <hellosticky at gmail.com<mailto:hellosticky at gmail.com>> wrote:
Hi, I've compiled IronPython from the latest source code, and added some
strong name keys to run in a partial trust AppDomain, but I can't quite get
the ScriptEngine created:

System.ArgumentException: Unknown language name: 'py'
  at Microsoft.Scripting.Hosting.ScriptRuntime.GetEngine(String
  at mycode

The code creating this is:

ScriptRuntimeSetup setup = new ScriptRuntimeSetup();
ScriptRuntime runtime = new ScriptRuntime(setup);
runtime.IO.SetOutput(ms, writer);
ScriptEngine engine = runtime.GetEngine("py");
ScriptScope scope = engine.CreateScope();

I would prefer to do this programmatically, without any external .config
files, if possible.

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