[IronPython] Engine Scope

[Michael Foord]

Hello JoeSox,

If you look at the ArrayList documentation (URL below) you will see that 
although it lives in the System namespace, it comes from the 
mscorlib.dll assembly.

You will have to add an additional reference in your Python code 
(ipy.exe adds references to both of these for you which is why your code 
works from the interactive interpreter).

An alternative is adding the references to the assemblies from your 
hosting code using LoadAssembly.

http://msdn.microsoft.com/en-us/library/system.collections.arraylist.aspx

Michael



JoeSox wrote:
> Why can't I access the ArrayList class in the unworking example below?
> (Forgive me if this was covered previously but I couldn't find
> anything in the archives)
>
> ------------working example...------------------
> IronPython 2.0 Beta (2.0.0.4000) on .NET 2.0.50727.1433
> Type "help", "copyright", "credits" or "license" for more information.
>   
>>>> import clr
>>>> clr.AddReference("System")
>>>> dir()
>>>>         
> ['__builtins__', '__doc__', '__name__', 'clr']
>   
>>>> from System.Collections import ArrayList
>>>> dir()
>>>>         
> ['ArrayList', '__builtins__', '__doc__', '__name__', 'clr']
>   
> -------------nonworking example...-----------------
>             ScriptEngine newengine = ScriptRuntime.Create().GetEngine("py");
>             ScriptScope scope = newengine.CreateScope();
>             string pycode = @"
> import clr
> clr.AddReference('System')
> from System.Collections import ArrayList";
>             ScriptSource source =
> newengine.CreateScriptSourceFromString(pycode,
> System.Scripting.SourceCodeKind.Statements);
>
> [Exception...]
> IronPython.Runtime.Exceptions.ImportException was unhandled
>   Message="Cannot import name ArrayList"
>   Source="IronPython"
>   StackTrace:
>        at IronPython.Runtime.Importer.ImportFrom(CodeContext context,
> Object from, String name)
>        at IronPython.Runtime.Operations.PythonOps.ImportFrom(CodeContext
> context, Object module, String name)
>        at <module>$1##1(Closure , Scope , LanguageContext )
>        at System.Scripting.ScriptCode.InvokeTarget(LambdaExpression
> code, Scope scope)
>        at System.Scripting.Runtime.OptimizedScriptCode.InvokeTarget(LambdaExpression
> code, Scope scope)
>        at System.Scripting.ScriptCode.Run(Scope scope)
>        at System.Scripting.SourceUnit.Execute(Scope scope, ErrorSink errorSink)
>        at Microsoft.Scripting.Hosting.ScriptSource.Execute(ScriptScope
> scope).....
>   


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