[Python.NET] This assembly is built by a runtime newer than the currently loaded runtime

[David Hirschfeld]

I needed to access .NET dlls compiled for .NET4 and also ran into the 
System.BadImageFormatException error.

I opened PythonDotNET in VS2010 and it compiled fine with only a couple of 
errors about System.Security.Permissions.SecurityAction.RequestMinimum being 
obsolete. Unfortunately when I tried to import clr I got the following error:

SystemError: dynamic module not initialized properly

Looking further into it I found that in buildclrmodule.bat lines 33 & 66
referenced the .NET2 idalsm.exe:

%windir%\Microsoft.NET\Framework\v2.0.50727\ilasm /nologo /quiet /dll 
%ILASM_EXTRA_ARGS% /include=%INCLUDE_PATH% /output=%OUTPUT_PATH% %INPUT_PATH%

I changed this to reference the .NET4 version:

%windir%\Microsoft.NET\Framework\v4.0.30319\ilasm /nologo /quiet /dll 
%ILASM_EXTRA_ARGS% /include=%INCLUDE_PATH% /output=%OUTPUT_PATH% %INPUT_PATH%

...and everything works perfectly!

HTH,
Dave


-----Original Message-----
From: Brandon Craig Rhodes 
Sent: 28 May 2010 21:36
To: Dave Hirschfeld
Cc: pythondotnet at python.org
Subject: Re: [Python.NET] how can I build an assembly I can AddReference()?

Brandon Craig Rhodes <brandon at rhodesmill.org> writes:

> System.BadImageFormatException: This assembly is built by a runtime newer 
> than the currently loaded runtime and cannot be loaded. (Exception from 
> HRESULT: 0x8013101B)
>    at System.Reflection.Assembly.nLoadFile(String path, Evidence evidence)
>    at System.Reflection.Assembly.LoadFile(String path)

This afternoon I uninstalled Visual Studio 2010 from my laptop and
re-installed Visual Studio 2008, then rebuilt "Brandon.dll", in the
hopes that 2010 was simply too recent a version of Studio to be using
with the c:\python26 from the python.org page.  Sadly, I was wrong; I
still get the above error when trying to import the DLL.


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