[IronPython] FW: FW: returning inherited classes to .NET
Howland-Rose, Kyle
Kyle.Howland-Rose at aar.com.au
Fri Feb 22 06:44:34 CET 2008
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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