<div>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.<br>
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<div class="gmail_quote">On Sun, Feb 24, 2008 at 2:22 PM, Howland-Rose, Kyle <<a href="mailto:Kyle.Howland-Rose@aar.com.au">Kyle.Howland-Rose@aar.com.au</a>> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>
<div><font face="Arial" color="#0000ff" size="2"><span>Awesome, thanks Curt. </span></font></div>
<div><font face="Arial" color="#0000ff" size="2"><span></span></font> </div>
<div><font face="Arial" color="#0000ff" size="2"><span>Do you have any idea as to whether this is a bug or a feature?</span></font></div><br>
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<font face="Tahoma" size="2"><b>From:</b> <a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a> [mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>] <b>On Behalf Of </b>Curt Hagenlocher<br>
<b>Sent:</b> Saturday, 23 February 2008 1:33 AM<br><b>To:</b> Discussion of IronPython<br><b>Subject:</b> Re: [IronPython] FW: FW: FW: returning inherited classes to .NET<br></font><br></div>
<div></div>
<div>I built a test executable and was able to reproduce this. And when I changed </div>
<div>clr.AddReferenceToFile("WebControlLibrary.dll")</div>
<div>to</div>
<div>clr.AddReference("WebControlLibrary")</div>
<div>it worked as expected.<br></div>
<div class="gmail_quote">On Fri, Feb 22, 2008 at 6:02 AM, Curt Hagenlocher <<a href="mailto:curt@hagenlocher.org" target="_blank">curt@hagenlocher.org</a>> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">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 <a href="http://asp.net/" target="_blank">ASP.NET</a> -- and see if you still get the same error.
<div>
<div></div>
<div><br><br>
<div class="gmail_quote">On Thu, Feb 21, 2008 at 10:07 PM, Howland-Rose, Kyle <<a href="mailto:Kyle.Howland-Rose@aar.com.au" target="_blank">Kyle.Howland-Rose@aar.com.au</a>> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>
<div><font face="Arial" color="#0000ff" size="2"><span>Thanks for your help so late Curt (not that I need a quick answer at all).</span></font></div>
<div><font face="Arial" color="#0000ff" size="2"><span></span></font> </div>
<div><font face="Arial" color="#0000ff" size="2"><span>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. </span></font><font face="Arial"><font color="#0000ff"><font size="2"><span>Is this what you mean by "running it directly"? </span><span> </span><span> </span></font></font></font></div>
<div><font face="Arial"><font color="#0000ff"><font size="2"><span></span></font></font></font> </div>
<div><font face="Arial"><font color="#0000ff"><font size="2"><span>Thanks again,</span></font></font></font></div>
<div><font face="Arial"><font color="#0000ff"><font size="2"><span>Kyle</span></font></font></font></div>
<div><br></div>
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<hr>
<font face="Tahoma" size="2">
<div><b>From:</b> <a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a> [mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>] <b>On Behalf Of </b>Curt Hagenlocher<br>
</div><b>Sent:</b> Friday, 22 February 2008 4:55 PM<br><b>To:</b> Discussion of IronPython<br><b>Subject:</b> Re: [IronPython] FW: FW: returning inherited classes to .NET<br></font><br></div>
<div>
<div></div>
<div>
<div></div>
<div>If you're only getting the error under <a href="http://asp.net/" target="_blank">ASP.NET</a>, 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 <a href="http://asp.net/" target="_blank">ASP.NET</a> makes shadow copies of your files, but there could be other reasons as well (none of which, unfortunately, come to mind right now).</div>
<div> </div>
<div>Using an interface instead of a base class would give you the same results.<br></div>
<div class="gmail_quote">On Thu, Feb 21, 2008 at 9:44 PM, Howland-Rose, Kyle <<a href="mailto:Kyle.Howland-Rose@aar.com.au" target="_blank">Kyle.Howland-Rose@aar.com.au</a>> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>
<div><font face="Arial" color="#0000ff" size="2"><span>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 :(</span></font></div>
<div><font face="Arial" color="#0000ff" size="2"><span></span></font> </div>
<div><font face="Arial" color="#0000ff" size="2"><span>I wanted to so some moderately heavy reflection which to my thinking should be easier from IP but I will use VB for now. </span></font></div>
<div><font face="Arial" color="#0000ff" size="2"><span></span></font> </div>
<div><font face="Arial" color="#0000ff" size="2"><span>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?</span></font></div>
<div><font face="Arial" color="#0000ff" size="2"><span>(All pointers to pre-existing doco warmly received :)</span></font></div>
<div><font face="Arial" color="#0000ff" size="2"><span></span></font> </div>
<div><font face="Arial" color="#0000ff" size="2"><span>Thanks</span></font></div>
<div><font face="Arial" color="#0000ff" size="2"><span>Kyle</span></font></div><br>
<div lang="en-us" dir="ltr" align="left">
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<font face="Tahoma" size="2">
<div><b>From:</b> <a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a> [mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>] <b>On Behalf Of </b>Curt Hagenlocher<br>
</div><b>Sent:</b> Friday, 22 February 2008 4:29 PM<br><b>To:</b> Discussion of IronPython<br><b>Subject:</b> Re: [IronPython] FW: returning inherited classes to .NET<br></font><br></div>
<div>
<div></div>
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<div></div>
<div>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 <a href="http://asp.net/" target="_blank">ASP.NET</a>?</div>
<div><br> </div>
<div class="gmail_quote">On Thu, Feb 21, 2008 at 8:43 PM, Howland-Rose, Kyle <<a href="mailto:Kyle.Howland-Rose@aar.com.au" target="_blank">Kyle.Howland-Rose@aar.com.au</a>> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hi Curt,<br><br>Thanks for replying. When I view the link I see the following:<br><br>The .NET code creates the "Test" class and then runs the python code<br>
which imports the "Test" class a subclasses it to create python class<br>"X".<br><br>Class "X" is then called and cast to type "Test" and assigned to the<br>value obj.<br><br>Is this what you are looking at?<br>
<br>My code is pretty much identical. The VB looks like:<br><br><br>Public MustInherit Class ChildControl<br> Public Function Control() As WebControl<br> Return Nothing<br> End Function<br> Public Function GetValue() As String<br>
Return Nothing<br> End Function<br> Public Function SetValue(ByVal value As Object) As String<br> Return Nothing<br> End Function<br>End Class<br><br>Class IPReflection<br> Private Shared Instance As IPReflection = Nothing<br>
Private PyEngine As PythonEngine<br> Private PyModule As EngineModule<br><br> Public Shared Function Inst() As IPReflection<br> If Instance Is Nothing Then<br> Instance = New IPReflection<br> End If<br>
Return Instance<br> End Function<br><br> Private Sub New()<br> Dim path As String = HttpContext.Current.Request.MapPath(".")<br> PyEngine = New PythonEngine<br> PyEngine.AddToPath(path)<br>
PyModule = PyEngine.CreateModule<br> PyEngine.DefaultModule = PyModule<br><br>PyEngine.ExecuteFile(HttpContext.Current.Request.MapPath("CustomControls<br>.py"))<br> End Sub<br><br> Public Function GetChildControl() As ChildControl<br>
Return<br>CType(Operations.Ops.Call(PyModule.Globals("GetControl")), ChildControl)<br> End Function<br>End Class<br><br>And the python looks like:<br><br>import clr<br>import sys<br><br>clr.AddReference('System')<br>
import System<br><br>sys.path.append(sys.path[0] + "/bin")<br><br>clr.AddReferenceToFile("WebControlLibrary.dll")<br>clr.AddReference('System.Web')<br><br>from System.Web.UI.WebControls import Label<br>
<br>from WebControlLibrary import ChildControl<br><br>class LabelChildControl(ChildControl):<br> def __init__(self):<br> self.control = Label()<br> def Control(self):<br> return self.control<br>
<br>def GetControl():<br> return LabelChildControl()<br><br><br>Thanks again,<br>Kyle<br>
<div><br>________________________________<br><br>From: <a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a><br></div>[mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>] On Behalf Of Curt<br>
Hagenlocher<br>Sent: Friday, 22 February 2008 3:08 PM<br>To: Discussion of IronPython<br>Subject: Re: [IronPython] returning inherited classes to .NET<br>
<div>
<div></div>
<div><br><br>The page in question doesn't seem to show what you describe -- deriving<br>a Python class from a C# class. Maybe you could show us your sample<br>code?<br><br><br>On Thu, Feb 21, 2008 at 7:39 PM, Howland-Rose, Kyle<br>
<<a href="mailto:Kyle.Howland-Rose@aar.com.au" target="_blank">Kyle.Howland-Rose@aar.com.au</a>> wrote:<br><br><br> Hi all,<br> I am following<br><br><br><a href="http://www.ironpython.info/index.php/Using_Python_Classes_from_.NET" target="_blank">http://www.ironpython.info/index.php/Using_Python_Classes_from_.NET</a><br>
<<a href="http://www.ironpython.info/index.php/Using_Python_Classes_from_.NET" target="_blank">http://www.ironpython.info/index.php/Using_Python_Classes_from_.NET</a>><br>but using VB.<br><br> In VB I declare a class and derive a python 1.1 class from it<br>
but when I return it I get the exception:<br><br> "Unable to cast object of type<br>'IronPython.NewTypes.WebControlLibrary.ChildControl_1' to type<br>'WebControlLibrary.ChildControl'."<br><br>
The page referenced above just seems to cast the python class<br>instance to the C# class instance but this does not work for me in VB.<br><br> Any help would be appreciated :)<br><br> Thanks,<br><br> Kyle<br>
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