Help with getting properties to work will hopefully resolve the
databinding as well ;-)
The property getter looks wrong but I have no idea what's wrong:
py> props = a.root.listbox1.Items[0].GetType().GetProperties()
py> props
=> Array[PropertyInfo]((<System.Reflection.RuntimePropertyInfo object at
0x000000000000002C [System.String name]>))
py> 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
Just for clarification "a" is Silverlight Application instance
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.
--
-- Lukáš
Shri Borde wrote:
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__)
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