[IronPython] FW: returning inherited classes to .NET

[Curt Hagenlocher]

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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