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 :)
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. props = a.root.listbox1.Items[0].GetType().GetProperties() prop = props[0] prop.GetGetMethod.Invoke(a, None) # call using Reflection 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. From: users-boun...@lists.ironpython.com [mailto:users-boun...@lists.ironpython.com] On Behalf Of Lukas Cenovsky Sent: Friday, November 13, 2009 5:42 AM To: Discussion of IronPython Subject: Re: [IronPython] .NET attributes for methods This looks very promising but I cannot make it work. I have changed product.py in DevHawk's example to: #from clrtypeold import ClrMetaclass import clrtype class Product(object): #__metaclass__ = ClrMetaclass __metaclass__ = clrtype.ClrClass _clrnamespace = "DevHawk.IronPython.ClrTypeSeries" #_clrproperties = { #"name":str, #"cost":float, #"quantity":int, #} def __init__(self, name, cost, quantity): self.name = name self.cost = cost self.quantity = quantity def calc_total(self): return self.cost * self.quantity @property @clrtype.accepts() @clrtype.returns(str) def name(self): return self._name @name.setter @clrtype.accepts(str) @clrtype.returns() def name(self, value): self._name = value When I run it I don't see any items in the listbox. When I check the name, it is a property: py> a.root.listbox1.Items[0] => <Product object at 0x000000000000002B> py> a.root.listbox1.Items[0].GetType().GetProperties() => Array[PropertyInfo]((<System.Reflection.RuntimePropertyInfo object at 0x000000000000002C [System.String name]>)) Whe I used the old clrtype with _clrproperties = {'name': str, ...}, it worked. -- -- Lukáš Shri Borde wrote: 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. 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: class notify_property(property): def propagate_attributes(old_function, new_function): new_function.func_name = old_function.func_name new_function.arg_types = old_function.arg_types new_function.return_type = old_function.return_type def __init__(self, getter): def newgetter(slf): try: return getter(slf) except AttributeError: return None propagate_attributes(getter, newgetter) super(notify_property, self).__init__(newgetter) def setter(self, setter): def newsetter(slf, newvalue): oldvalue = self.fget(slf) if oldvalue != newvalue: setter(slf, newvalue) slf.OnPropertyChanged(setter.__name__) propagate_attributes(setter, newsetter) return property( fget=self.fget, fset=newsetter, fdel=self.fdel, doc=self.__doc__) From: Lukas Cenovsky [mailto:cenov...@bakalari.cz] Sent: Thursday, November 12, 2009 11:01 AM To: Shri Borde Subject: Re: [IronPython] .NET attributes for methods Shri Borde wrote: So the new clrtype.py still works - cool! Yep ;-) I am not an expert on data binding, so I don't have any suggestions. Why do you say that the decorator approach will not work with Silverlight? Does @notifiy_property from http://gui-at.blogspot.com/2009/11/inotifypropertychanged-in-ironpython.html use any feature not available in Silverlight? It does not (as far as I know because it is pure IronPython). But @notify_property does not work with clrtypes: class ViewModel(NotifyPropertyChangedBase): __metaclass__ = clrtype.ClrMetaclass _clrnamespace = "Cenda.ViewModel" _clrproperties = {'size': str} def __init__(self): super(ViewModel, self).__init__() # must be string to two-way binding work correctly self.size = '10' @notify_property def size(self): return self._size @size.setter def size(self, value): self._size = value print 'Size changed to %r' % self.size When I run this code, the size is still clr property and Python getter and setter are not run. So basically I need to override/enhance clr getter and setter created by clrtype._clrproperties. -- -- Lukáš From: Lukas Cenovsky [mailto:cenov...@bakalari.cz] Sent: Thursday, November 12, 2009 8:09 AM To: Shri Borde Subject: Re: [IronPython] .NET attributes for methods Thanks, that works! What do you think would be the best approach to create notifiable properties for Silverlight? I did it for WPF (via decorators: http://gui-at.blogspot.com/2009/11/inotifypropertychanged-in-ironpython.html) but it seems to me it won't be possible to do it similarly for Silverlight... -- -- Lukáš Shri Borde wrote: Can you use "_clrproperties" instead of "_clrfields"? DevHawk's same created a field and a property even when you just used "_clrfields". I don't do that anymore. So you will need to use "_clrproperties" to get properties, which SL must use for data binding. From: users-boun...@lists.ironpython.com<mailto:users-boun...@lists.ironpython.com> [mailto:users-boun...@lists.ironpython.com] On Behalf Of Lukas Cenovsky Sent: Wednesday, November 11, 2009 2:37 AM To: Discussion of IronPython Subject: Re: [IronPython] .NET attributes for methods I did change __metaclass__ to ClrMetaclass. See the attached source I use for testing - the only difference is to comment/uncomment appropriate part in product.py. The outputs look the same, there are no visible exceptions: DevHawk: py> a.root.FindName('listbox1').ItemsSource[0].GetType().GetFields() => Array[FieldInfo]((<System.Reflection.RtFieldInfo object at 0x000000000000002B [Double cost]>, <System.Reflection.RtFieldInfo object at 0x000000000000002C [Int32 quantity]>, <System.Reflection.RtFieldInfo object at 0x000000000000002D [System.String name]>, <System.Reflection.RtFieldInfo object at 0x000000000000002E [IronPython.Runtime.Types.PythonType .class]>, <System.Reflection.RtFieldInfo object at 0x000000000000002F [IronPython.Runtime.PythonDictionary .dict]>, <System.Reflection.RtFieldInfo object at 0x0000000000000030 [System.Object[] .slots_and_weakref]>)) Shri: py> a.root.FindName('listbox1').ItemsSource[0].GetType().GetFields() => Array[FieldInfo]((<System.Reflection.RtFieldInfo object at 0x000000000000002B [Double cost]>, <System.Reflection.RtFieldInfo object at 0x000000000000002C [Int32 quantity]>, <System.Reflection.RtFieldInfo object at 0x000000000000002D [System.String name]>, <System.Reflection.RtFieldInfo object at 0x000000000000002E [IronPython.Runtime.Types.PythonType .class]>, <System.Reflection.RtFieldInfo object at 0x000000000000002F [IronPython.Runtime.PythonDictionary .dict]>, <System.Reflection.RtFieldInfo object at 0x0000000000000030 [System.Object[] .slots_and_weakref]>)) -- -- Lukáš Shri Borde wrote: Note that you will have to set __metaclass__ to ClrMetaclass, not ClrTypeMetaclass as in DevHawk's sample. I had changed the name of the type. The old name will cause a NameError, but maybe SL is hiding exceptions. Can you do "o.GetType().GetFields()" and display that on the page to inspect the object and also make sure that no exceptions were thrown? From: users-boun...@lists.ironpython.com<mailto:users-boun...@lists.ironpython.com> [mailto:users-boun...@lists.ironpython.com] On Behalf Of Lukas Cenovsky Sent: Tuesday, November 10, 2009 2:59 PM To: Discussion of IronPython Subject: Re: [IronPython] .NET attributes for methods I have just found that the Silverlight binding does not work with this version of clrtype and/or IronPython 2.6RC2. I used DevHawk demo [1] and after I added reference to Microsoft.Dynamic in clrtypemetaclass.py it worked flawlessly. But when I switch to your version, no items show in the listbox. By the way - I have seen a commit message you have added support for interfaces - nice! ;-) -- -- Lukáš [1] http://cid-0d9bc809858885a4.skydrive.live.com/self.aspx/DevHawk%20Content/IronPython%20Stuff/^_^_clrtype^_^_/SL%20databinding%20demo.zip<http://cid-0d9bc809858885a4.skydrive.live.com/self.aspx/DevHawk%20Content/IronPython%20Stuff/%5E_%5E_clrtype%5E_%5E_/SL%20databinding%20demo.zip> ________________________________ _______________________________________________ Users mailing list Users@lists.ironpython.com<mailto:Users@lists.ironpython.com> http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
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