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Thanks to Shri and the new clrtype both issues are resolved. I will
post details soon on my blog.<br>
<br>
--<br>
-- Luká¹<br>
<br>
Lukas Cenovsky wrote:
<blockquote cite="mid:4AFD88A1.30807@bakalari.cz" type="cite">
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Help with getting properties to work will hopefully resolve the
databinding as well ;-)<br>
<br>
The property getter looks wrong but I have no idea what's wrong:<br>
<br>
<pre><span class="silverlightDlrReplPrompt">py> </span>props = a.root.listbox1.Items[0].GetType().GetProperties()
py> props
=> Array[PropertyInfo]((<System.Reflection.RuntimePropertyInfo object at 0x000000000000002C [System.String name]>))
py> <span class="silverlightDlrReplPrompt"></span>prop = props[0]
py> prop.GetGetMethod()
=> <System.Reflection.RuntimeMethodInfo object at 0x000000000000002B [System.String name()]>
py> prop.GetGetMethod().Invoke(a.root.listbox1.Items[0], None)
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
at <module> in <string>, line 0
</pre>
<span class="silverlightDlrReplOutput"></span><br>
Just for clarification "<tt>a"</tt> is Silverlight Application instance<br>
<br>
As for the interface error - this is a different strory. You may
remember I created WCF service in IronPython with just interface
defined in C#. To be able to move interface to IronPython, I need such
interface to work with Silverlight too because Silverlight is the cause
why I am building WCF services.<br>
<br>
--<br>
-- Luká¹<br>
<br>
<br>
Shri Borde wrote:
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<div class="Section1">
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">I
can help you create a property. And I can help you get it to
work with your decorators (you can check if the “name” property
exposes your @notify_property wrapper methods or not, and presumably
that works).
Beyond that, you are on your own :) <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">I
would try calling the property methods to make sure they are
accessible. Something like this. If that works, I am not sure what
Silverlight
needs to make databinding happy.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal">props =
a.root.listbox1.Items[0].GetType().GetProperties()<o:p></o:p></p>
<p class="MsoNormal">prop = props[0]<o:p></o:p></p>
<p class="MsoNormal">prop.GetGetMethod.Invoke(a, None) # call using
Reflection<span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">About
the “SystemError: Application code cannot access
System.AppDomain.get_CurrentDomain() using Reflection.” error when
defining interfaces, it could be worked around. We need to call
AppDomain.DefineDynamicAssembly, and IronPython itself does do this. So
its
just a question of figuring out the right way to access an AppDomain
instance.
Will look into it, but I doubt it will help you with data binding.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<div
style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
<a moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:users-bounces@lists.ironpython.com">users-bounces@lists.ironpython.com</a>
[<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="mailto:users-bounces@lists.ironpython.com">mailto:users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>Lukas
Cenovsky<br>
<b>Sent:</b> Friday, November 13, 2009 5:42 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] .NET attributes for methods<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom: 12pt;">This looks very
promising but I
cannot make it work. I have changed product.py in DevHawk's example to:<o:p></o:p></p>
<pre>#from clrtypeold import ClrMetaclass<o:p></o:p></pre>
<pre>import clrtype<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>class Product(object):<o:p></o:p></pre>
<pre> #__metaclass__ = ClrMetaclass<o:p></o:p></pre>
<pre> __metaclass__ = clrtype.ClrClass<o:p></o:p></pre>
<pre> _clrnamespace = "DevHawk.IronPython.ClrTypeSeries"<o:p></o:p></pre>
<pre> #_clrproperties = {<o:p></o:p></pre>
<pre> #"name":str,<o:p></o:p></pre>
<pre> #"cost":float,<o:p></o:p></pre>
<pre> #"quantity":int,<o:p></o:p></pre>
<pre> #}<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre> def __init__(self, name, cost, quantity):<o:p></o:p></pre>
<pre> self.name = name<o:p></o:p></pre>
<pre> self.cost = cost<o:p></o:p></pre>
<pre> self.quantity = quantity<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre> def calc_total(self):<o:p></o:p></pre>
<pre> return self.cost * self.quantity<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre> @property<o:p></o:p></pre>
<pre> @clrtype.accepts()<o:p></o:p></pre>
<pre> @clrtype.returns(str)<o:p></o:p></pre>
<pre> def name(self):<o:p></o:p></pre>
<pre> return self._name<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre> @name.setter<o:p></o:p></pre>
<pre> @clrtype.accepts(str)<o:p></o:p></pre>
<pre> @clrtype.returns()<o:p></o:p></pre>
<pre> def name(self, value):<o:p></o:p></pre>
<pre> self._name = value<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<p class="MsoNormal" style="margin-bottom: 12pt;">When I run it I
don't see any
items in the listbox. When I check the name, it is a property:<o:p></o:p></p>
<pre><span class="silverlightdlrreplprompt">py></span> a.root.listbox1.Items[0]<o:p></o:p></pre>
<div>
<pre>=> <Product object at 0x000000000000002B><o:p></o:p></pre>
</div>
<pre><span class="silverlightdlrreplprompt">py> </span>a.root.listbox1.Items[0].GetType().GetProperties()<o:p></o:p></pre>
<div>
<pre>=> Array[PropertyInfo]((<System.Reflection.RuntimePropertyInfo object at 0x000000000000002C [System.String name]>))<o:p></o:p></pre>
</div>
<pre><o:p> </o:p></pre>
<p class="MsoNormal">Whe I used the old clrtype with _clrproperties
=
{'name':
str, ...}, it worked.<br>
<br>
--<br>
-- Luká¹<br>
<br>
<br>
Shri Borde wrote: <o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Here
is an updated version of clrtype.py that uses @property +
@clrtype.accepts/@clrtype.returns to indicate a CLR property, instead
of using
“_clrproperties”. I think its more Pythonic in general, but also
you should be able to modify @notify_property to work with it. </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Note
that notify_property won’t just work. You will have
to change it to propagate the func_name, arg_types, and return_type
properties
from the old getter/setter function objects to the new getter/setter
function
objects since these values are used by clrtype to generate the CLR
members.
Something like this:</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">class
notify_property(property):</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
<span
style="background: yellow none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">def
propagate_attributes(old_function, new_function):</span></span><o:p></o:p></p>
<p class="MsoNormal"><span
style="background: yellow none repeat scroll 0% 50%; font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125); -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">
new_function.func_name = old_function.func_name</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="background: yellow none repeat scroll 0% 50%; font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125); -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">
new_function.arg_types = old_function.arg_types</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="background: yellow none repeat scroll 0% 50%; font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125); -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">
new_function.return_type = old_function.return_type</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
def __init__(self, getter):</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
def newgetter(slf):</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
try:</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
return getter(slf)</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
except AttributeError:</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
return None</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
<span
style="background: yellow none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">propagate_attributes(getter,
newgetter)</span></span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
super(notify_property, self).__init__(newgetter)</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
def setter(self, setter):</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
def newsetter(slf,
newvalue):</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
oldvalue = self.fget(slf)</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
if oldvalue != newvalue:</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
setter(slf, newvalue)</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
slf.OnPropertyChanged(setter.__name__)</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
<span
style="background: yellow none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">propagate_attributes(setter,
newsetter)</span></span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
return property(</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
fget=self.fget,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
fset=newsetter,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
fdel=self.fdel,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
doc=self.__doc__)</span><o:p></o:p></p>
</div>
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