[IronPython] deepcopy

Dino Viehland dinov at microsoft.com
Thu Jun 10 17:56:50 CEST 2010

Is there a DBNull value somewhere in your object?  DBNull is a singleton and I'd guess we'd need to add some custom logic which says the way we deserialize it is by pulling the singleton from DBNull.Value.  You can probably use copy_reg.pickle to register something which will handle objects of type DBNull that just returns DBNull.Value.

From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Pablo Dalmazzo
Sent: Thursday, June 10, 2010 7:57 AM
To: IronPython Mailing list
Subject: [IronPython] deepcopy

Hi there,

Im getting this error in the copy module. I moved the copy module from the IronPython 2.6 installation to work with
IronPython 2.0 for some compatibility problem I had with IronPython 2.6 dll with another dll we use.

The only difference I see between the cases which works and those which doesnt are, in the succesful case it is a custom class object "alone", and in the error case is the deepcopy of a custom class object which contains a list with other instances of that object.
Could that have anything to do with the problem? Is that a limitation of the copy module in Python or it should work?

error description:

No se puede encontrar el método 'DBNull..ctor'.

Error de código fuente:

Línea 322:        args = deepcopy(args, memo)

Línea 323:

Línea 324:    y = callable(*args)

Línea 325:

Línea 326:    memo[id(x)] = y

Archivo de origen: /SistemaVentaBaseIP2/App_Script/copy.py
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