Hi Germano,

It helps to look at the full exception and stack trace, not just the exception type. In this case you probably got this error "System.InvalidOperationException: The calling thread must be STA, because many UI components require this." which tells you that the main thread you're calling Application.Run from is not an STA thread.

The following code shows how to create and show a WPF Window.

Regards,
Tony
// window.xaml
<Window 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    Title="Test Window"
    Height="300"
    Width="300" />

import clr
clr.AddReference(r"wpf\PresentationFramework")

from System.IO import StreamReader
from System.Windows.Markup import XamlReader
from System.Windows import Application, Window
from System.Threading import Thread, ThreadStart, ApartmentState


def app_thread():
    stream = StreamReader("window.xaml")
    window = XamlReader.Load(stream.BaseStream)
    Application().Run(window)

thread = Thread(ThreadStart(app_thread))
thread.SetApartmentState(ApartmentState.STA)
thread.Start()
thread.Join()





On Sat, Jun 20, 2015 at 2:34 PM germano carella <germanocarella.list@gmail.com> wrote:
Hi,
I'm Germano From Italy.

I'm trying to write a wpf application using python for .net.
import clr
clr.AddReference("wpf\PresentationFramework.Classic")
clr.AddReference("wpf\PresentationCore")
from System.Windows import Window,Application

class MyWindow(Window):
  def __init__(self):
   Window.__init__(self)
   self.LoadComponent("page.xaml")

Application.Run(MyWindow())

InvalidOperationException!

There is something I heve to do?
What is wrong?
Thanks!
Germano
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