[IronPython] FW: Returning inherited classes to .NET
Howland-Rose, Kyle
Kyle.Howland-Rose at aar.com.au
Mon Feb 25 01:00:01 CET 2008
Is there a good place to read about these variants? I was using this
one because I did not want to use the GAC and AddReference failed just
using "WebControlLibrary" presumably because I needed to add the dll's
path to a path list somewhere.
________________________________
From: users-bounces at lists.ironpython.com
[mailto:users-bounces at lists.ironpython.com] On Behalf Of Curt
Hagenlocher
Sent: Monday, 25 February 2008 10:31 AM
To: Discussion of IronPython
Subject: Re: [IronPython] Returning inherited classes to .NET
It's a feature. clr.AddReferenceToFile ends up calling
Assembly.LoadFile under the covers, which lets you load multiple
versions of the same assembly. If this isn't the behavior you want, you
should use a differently variant of AddReference (such as
clr.AddReference). Each variant has its uses; this one's don't
correspond well with your intentions.
On Sun, Feb 24, 2008 at 2:22 PM, Howland-Rose, Kyle <
Kyle.Howland-Rose at aar.com.au> wrote:
Awesome, thanks Curt.
Do you have any idea as to whether this is a bug or a feature?
________________________________
From: users-bounces at lists.ironpython.com [mailto:
users-bounces at lists.ironpython.com] On Behalf Of Curt Hagenlocher
Sent: Saturday, 23 February 2008 1:33 AM
To: Discussion of IronPython
Subject: Re: [IronPython] FW: FW: FW: returning inherited
classes to .NET
I built a test executable and was able to reproduce this. And
when I changed
clr.AddReferenceToFile("WebControlLibrary.dll")
to
clr.AddReference("WebControlLibrary")
it worked as expected.
On Fri, Feb 22, 2008 at 6:02 AM, Curt Hagenlocher <
curt at hagenlocher.org> wrote:
Ah, no. I was thinking that you would modify your VB
code to launch it as a console app (for instance) rather than from
inside of ASP.NET <http://asp.net/> -- and see if you still get the
same error.
On Thu, Feb 21, 2008 at 10:07 PM, Howland-Rose, Kyle <
Kyle.Howland-Rose at aar.com.au> wrote:
Thanks for your help so late Curt (not that I
need a quick answer at all).
I am sure I am missing something big-time here
and "talking" as cross-purposes, but, to my mind the reason I don't have
a problem when running from the command line is because all I am doing
is running the ipy.exe on the file which loads some assemblies, creates
a class definition and a function definition and then terminates without
even instantiating the class. Is this what you mean by "running it
directly"?
Thanks again,
Kyle
________________________________
From: users-bounces at lists.ironpython.com
[mailto:users-bounces at lists.ironpython.com] On Behalf Of Curt
Hagenlocher
Sent: Friday, 22 February 2008 4:55 PM
To: Discussion of IronPython
Subject: Re: [IronPython] FW: FW: returning
inherited classes to .NET
If you're only getting the error under ASP.NET
<http://asp.net/> , then it's highly likely that you're loading multiple
copies of the same assembly, which is why the CLR can't cast your Python
class back to the VB base -- it literally considers them to be two
different classes. This may be related to the way ASP.NET
<http://asp.net/> makes shadow copies of your files, but there could be
other reasons as well (none of which, unfortunately, come to mind right
now).
Using an interface instead of a base class would
give you the same results.
On Thu, Feb 21, 2008 at 9:44 PM, Howland-Rose,
Kyle <Kyle.Howland-Rose at aar.com.au> wrote:
It runs fine from the command line but
then it does not do much ... yet. For the moment I am simplifying it by
removing IP :(
I wanted to so some moderately heavy
reflection which to my thinking should be easier from IP but I will use
VB for now.
I assume I *should* be able to return a
derived python class to VB? Alternatively I could implement an
interface. How can IP implement a .NET interface?
(All pointers to pre-existing doco
warmly received :)
Thanks
Kyle
________________________________
From: users-bounces at lists.ironpython.com
[mailto:users-bounces at lists.ironpython.com] On Behalf Of Curt
Hagenlocher
Sent: Friday, 22 February 2008 4:29 PM
To: Discussion of IronPython
Subject: Re: [IronPython] FW: returning
inherited classes to .NET
My apologies; I wasn't reading the code
correctly. That's probably a sign that I should be going to bed. :)
Have you tried simplifying your version just a little bit by running it
directly rather than through ASP.NET <http://asp.net/> ?
On Thu, Feb 21, 2008 at 8:43 PM,
Howland-Rose, Kyle <Kyle.Howland-Rose at aar.com.au> wrote:
Hi Curt,
Thanks for replying. When I view the
link I see the following:
The .NET code creates the "Test" class
and then runs the python code
which imports the "Test" class a
subclasses it to create python class
"X".
Class "X" is then called and cast to
type "Test" and assigned to the
value obj.
Is this what you are looking at?
My code is pretty much identical. The
VB looks like:
Public MustInherit Class ChildControl
Public Function Control() As
WebControl
Return Nothing
End Function
Public Function GetValue() As String
Return Nothing
End Function
Public Function SetValue(ByVal value
As Object) As String
Return Nothing
End Function
End Class
Class IPReflection
Private Shared Instance As
IPReflection = Nothing
Private PyEngine As PythonEngine
Private PyModule As EngineModule
Public Shared Function Inst() As
IPReflection
If Instance Is Nothing Then
Instance = New IPReflection
End If
Return Instance
End Function
Private Sub New()
Dim path As String =
HttpContext.Current.Request.MapPath(".")
PyEngine = New PythonEngine
PyEngine.AddToPath(path)
PyModule = PyEngine.CreateModule
PyEngine.DefaultModule = PyModule
PyEngine.ExecuteFile(HttpContext.Current.Request.MapPath("CustomControls
.py"))
End Sub
Public Function GetChildControl() As
ChildControl
Return
CType(Operations.Ops.Call(PyModule.Globals("GetControl")), ChildControl)
End Function
End Class
And the python looks like:
import clr
import sys
clr.AddReference('System')
import System
sys.path.append(sys.path[0] + "/bin")
clr.AddReferenceToFile("WebControlLibrary.dll")
clr.AddReference('System.Web')
from System.Web.UI.WebControls import
Label
from WebControlLibrary import
ChildControl
class LabelChildControl(ChildControl):
def __init__(self):
self.control = Label()
def Control(self):
return self.control
def GetControl():
return LabelChildControl()
Thanks again,
Kyle
________________________________
From: users-bounces at lists.ironpython.com
[mailto:
users-bounces at lists.ironpython.com] On Behalf Of Curt
Hagenlocher
Sent: Friday, 22 February 2008 3:08 PM
To: Discussion of IronPython
Subject: Re: [IronPython] returning
inherited classes to .NET
The page in question doesn't seem to
show what you describe -- deriving
a Python class from a C# class. Maybe
you could show us your sample
code?
On Thu, Feb 21, 2008 at 7:39 PM,
Howland-Rose, Kyle
<Kyle.Howland-Rose at aar.com.au> wrote:
Hi all,
I am following
http://www.ironpython.info/index.php/Using_Python_Classes_from_.NET
<
http://www.ironpython.info/index.php/Using_Python_Classes_from_.NET>
but using VB.
In VB I declare a class and
derive a python 1.1 class from it
but when I return it I get the
exception:
"Unable to cast object of type
'IronPython.NewTypes.WebControlLibrary.ChildControl_1' to type
'WebControlLibrary.ChildControl'."
The page referenced above just
seems to cast the python class
instance to the C# class instance but
this does not work for me in VB.
Any help would be appreciated :)
Thanks,
Kyle
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