[IronPython] Custom Host - Import CLR fails

[Ben Hall]

Hi Dino,

Thanks for your reply.  Spent all day trying to debug the problem.  I
have the code working in a POC, I have it working in my UI but my unit
tests are failing.

The exception being raised is (different to before):

  Unhandled Exception System.TypeInitializationException: The type
initializer for 'IronPython.Runtime.Importer' threw an exception. --->
System.InvalidProgramException: Common Language Runtime detected an
invalid program.
   at Microsoft.Scripting.Actions.CallSiteFactory.CreateSimpleCallSite[T0,T1,T2,T3,T4,T5,R](ActionBinder
binder)
   at IronPython.Runtime.Importer.MakeImportSite()
   at IronPython.Runtime.Importer..cctor()
   --- End of inner exception stack trace ---
   at IronPython.Runtime.Importer.Import(CodeContext context, String
fullName, PythonTuple from, Int32 level)
   at IronPython.Runtime.Operations.PythonOps.ImportTop(CodeContext
context, String fullName, Int32 level)
   at Initialize##1(Closure , CodeContext )
   at Microsoft.Scripting.ScriptCode.Run(CodeContext context, Boolean
tryEvaluate)
   at Microsoft.Scripting.ScriptCode.Run(Scope scope, Boolean tryEvaluate)
   at Microsoft.Scripting.ScriptCode.Run(Scope scope)
   at Microsoft.Scripting.SourceUnit.Execute(Scope scope, ErrorSink errorSink)
   at Microsoft.Scripting.SourceUnit.Execute(Scope scope)
   at Microsoft.Scripting.Hosting.ScriptScope.Execute(String code)

Information wrote to Debug window:
'ProcessInvocation.exe' (Managed): Loaded 'Snippets'
'ProcessInvocation.exe' (Managed): Loaded 'Snippets'
'ProcessInvocation.exe' (Managed): Loaded 'Anonymously Hosted
DynamicMethods Assembly'
A first chance exception of type 'System.TypeInitializationException'
occurred in Unknown Module.

Any tips on how I can get to the bottom of this?

Thanks

Ben


On Sat, May 17, 2008 at 3:01 AM, Dino Viehland
<dinov at exchange.microsoft.com> wrote:
> This works for me in IronPython 2.0B2:
>
> using System;
> using System.Reflection;
>
> using Microsoft.Scripting;
> using Microsoft.Scripting.Hosting;
>
> class Test {
>    public static void Main(string[]args) {
>            ScriptRuntime runtime = ScriptRuntime.Create();
>            ScriptEngine engine = runtime.GetEngine("py");
>
>            runtime.LoadAssembly(typeof(string).Assembly);
>            runtime.LoadAssembly(typeof(System.Diagnostics.Debug).Assembly);
>
>            Assembly assem = Assembly.GetAssembly(Type.GetType("System.Text.StringBuilder"));
>            engine.Runtime.LoadAssembly(assem);
>
>            //ScriptSource code = engine.CreateScriptSourceFromString("import clr\n", SourceCodeKind.File);
>            ScriptScope source = engine.CreateScope();
>            source.Execute("import clr\nprint clr\nimport System\nSystem.Console.WriteLine('hello world')\n");
>
>    }
> }
>
> It prints:
>
> <module 'clr' (built-in)>
> hello world
>
> Do you still get an exception with this code?  I also realize you were trying to load them dynamically on another thread but it might be worth pointing out this doesn't actually end up w/ any dependencies on IronPython.dll or IronPython.Modules.dll as written.
>
>
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Ben Hall
> Sent: Friday, May 16, 2008 6:09 PM
> To: Discussion of IronPython
> Subject: [IronPython] Custom Host - Import CLR fails
>
> Hi,
>
> After getting Python code to work successfully, I decided to quickly
> import the CLR and access some .Net objects. At this point my code
> blew up.
> The code I tried to execute was "import clr".
>
> Exception is this:
>
> Unhandled Exception System.NullReferenceException: Object reference
> not set to an instance of an object.
>   at Microsoft.Scripting.Utils.SlowReflectedCaller.InvokeInstance(Object
> instance, Object[] args)
>   at Microsoft.Scripting.Actions.ActionBinder.UpdateSiteAndExecute[T](CodeContext
> context, CallSite`1 site, Object[] args)
>   at Microsoft.Scripting.Actions.UpdateDelegates.Update5[T0,T1,T2,T3,T4,TRet](CallSite
> site, CodeContext context, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4
> arg4)
>   at Microsoft.Scripting.Actions.DynamicSite`6.Invoke(CodeContext
> context, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
>   at IronPython.Runtime.Importer.Import(CodeContext context, String
> fullName, PythonTuple from, Int32 level)
>   at IronPython.Runtime.Operations.PythonOps.ImportTop(CodeContext
> context, String fullName, Int32 level)
>   at Initialize##1(Closure , CodeContext )
>   at Microsoft.Scripting.ScriptCode.Run(CodeContext context, Boolean
> tryEvaluate)
>   at Microsoft.Scripting.ScriptCode.Run(Scope scope, Boolean tryEvaluate)
>   at Microsoft.Scripting.ScriptCode.Run(Scope scope)
>   at Microsoft.Scripting.SourceUnit.Execute(Scope scope, ErrorSink errorSink)
>   at Microsoft.Scripting.SourceUnit.Execute(Scope scope)
>   at Microsoft.Scripting.Hosting.ScriptScope.Execute(String code)
>   at MyApp.Engine.ScriptExecutor.ExecuteStatement(String code)
>
> After a bit of search, I found that you don't load mscorlib for us.
>
> I have tried 3 different ways to import the assemblies everyone says I
> need to load:
>
>            ScriptRuntime runtime = ScriptRuntime.Create();
>            ScriptEngine engine = runtime.GetEngine();
>
>            LanguageContext Language =
> HostingHelpers.GetLanguageContext(engine);
>            Language.DomainManager.LoadAssembly(typeof(string).Assembly);
>            Language.DomainManager.LoadAssembly(typeof(System.Diagnostics.Debug).Assembly);
>
>            runtime.LoadAssembly(typeof(string).Assembly);
>            runtime.LoadAssembly(typeof(System.Diagnostics.Debug).Assembly);
>
>            Assembly assem =
> Assembly.GetAssembly(Type.GetType("System.Text.StringBuilder"));
>            engine.Runtime.LoadAssembly(assem);
>
> To execute the code, I do this:
>            ScriptScope source = Engine.CreateScope();
>            source.Execute(code);
>
> However nothing, I still get the exception.
>
> Any suggestions on where I am going wrong?
>
> Thanks
>
> Ben Hall
> Blog.BenHall.me.uk
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