[IronPython] Serializing IronPython classes

[Serge]

Okay now this is getting interesting. I assumed that the warning was about
the child class, but I'm not sure. A bit of info: The parent C# class is
called Object. I did the override on on __reduce_ex__  as you suggested
but trying to pickle still produced the same error:

Type 'IronPython.NewTypes.Engine.Object_1$2' in Assembly
'Snippets.scripting, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'
is not marked as serializable.

For curiosity, I called __reduce_ex__ on a child instance and
got the following error: expected Vector2, got Object_1$2

There are several Microsoft.Xna.Framework.Vector2 members and it looks like
they're being replaced by this Object_1$2 which I assumed at first to be the
child class because of its name.
__reduce_ex__ on the parent instances works fine. I'm out of my depth here
so I can't give more meaningful information.

On 10/7/08, Dino Viehland <dinov at microsoft.com> wrote:
>
> Ahh, that sounds like a bad bug, but I think I know what's causing it –
> we're hitting the new.NET serialization support because __reduce_ex__ is now
> defined for you J  Can you add an override that dispatches __reduce_ex__
> to the object version, eg:
>
>
>
> def __reduce_ex__(self, *args):
>
>     return object.__reduce_ex__(self, *args)
>
>
>
> We should probably do that automatically for user-defined instances which
> should be easy to do if this works for you.
>
>
>
> *From:* users-bounces at lists.ironpython.com [mailto:
> users-bounces at lists.ironpython.com] *On Behalf Of *Serge
> *Sent:* Monday, October 06, 2008 7:36 PM
> *To:* Discussion of IronPython
> *Subject:* Re: [IronPython] Serializing IronPython classes
>
>
>
> Thanks for the heads up, however trying to use cPickle, I still get the
> error saying that the child class is not marked as serializable..?
>
> On 10/7/08, *Dino Viehland* <dinov at microsoft.com> wrote:
>
> I would strongly encourage you to use cPickle or pickle instead of .NET
> serialization.  In 2.0 all .NET serializable types can also be pickled –
> they define __reduce_ex__ which handles this.
>
>
>
> First off we should be setting the serializable bit on subclasses that are
> serializable – that's just a bug that we're not doing that.  But once we've
> done that the problem w/ .NET serialization is that ultimately we need a
> static method or type that we can point at that does the deserialization.
> For a user defined type in Python we will need to be able to deserialize the
> type, the module the type lives in, and presumably even the ScriptRuntime
> which holds the module.  Pickle handles this by serializing the module &
> type name but w/o a ScriptRuntime we couldn't even get at that.  We might
> have been able to require a ScriptRuntime to be smuggled in the
> StreamingContext but it's not clear that it would work well.
>
>
>
> So if you really want .NET serialization we can fix the bug – but you'll
> need to implement ISerializable and figure out some way to deal getting the
> class, module, and runtime information saved/restored yourself.
>
>
>
> *From:* users-bounces at lists.ironpython.com [mailto:
> users-bounces at lists.ironpython.com] *On Behalf Of *Serge
> *Sent:* Sunday, October 05, 2008 9:24 PM
> *To:* users at lists.ironpython.com
> *Subject:* [IronPython] Serializing IronPython classes
>
>
>
> I've run into problems with serialization. I have a serializable class
> defined in C# which gets extended from IP, however when I try to serialize a
> collection of both parent and child instances, I get an exception saying
> that the IP generated class is not marked as serializable.
>
> With the lack of attributes, I am guessing I must do something else to
> enable serialization?
>
> Regards, Serge.
>
>
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