[IronPython] FW: returning inherited classes to .NET

[Howland-Rose, Kyle]

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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Allens Arthur Robinson online: http://www.aar.com.au
 
This email is confidential and may be subject to legal or other professional privilege. It is also subject to copyright. If you have received it in error, confidentiality and privilege are not waived and you must not disclose or use the information in it. Please notify the sender by return email and delete it from your system. Any personal information in this email must be handled in accordance with the Privacy Act 1988 (Cth).
 
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