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 -- and see if you still get the same error.
On Thu, Feb 21, 2008 at 10:07 PM, Howland-Rose, Kyle < [EMAIL PROTECTED]> 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:* [EMAIL PROTECTED] [mailto: > [EMAIL PROTECTED] *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 < > [EMAIL PROTECTED]> 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:* [EMAIL PROTECTED] [mailto: > > [EMAIL PROTECTED] *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 < > > [EMAIL PROTECTED]> 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: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] 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 > > > <[EMAIL PROTECTED]> 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 > > > > > > > > > > > > > > > > > > ************************************************************************ > > > > > > Allens Arthur Robinson online: http://www.aar.com.au > > > <http://www.aar.com.au/> > > > > > > This email is confidential and may be subject to legal or other > > > professional privilege. 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