Freeze in Python clr OpenFileDialog

Created Form in System.Windows.Forms.
The following will freeze in dialog.ShowDialog().
The MessageBox is displayed without any problems.
Windows 10, python 3.4.4 pythonnet 2.3.0.

import clr
clr.AddReference("System.Windows.Forms")
clr.AddReference("System.Drawing")

from System.Windows.Forms import Application,Form,TextBox
from System.Windows.Forms import ToolBar, ToolBarButton, OpenFileDialog, MessageBox

from System.Windows.Forms import DialogResult, ScrollBars, DockStyle, IWin32 Window


class IForm (Form):

    def__init__(self):
        self.Text="OpenDialog"

        toolbar=ToolBar()
        toolbar.Parent=self
        openb=ToolBarButton()


        self.textbox=TextBox()
        self.textbox.Parent=self
        self.textbox.Multiline=True
        self.textbox.ScrollBars=ScrollBars.Both
        self.textbox.WordWrap=False
        self.textbox.Parent=self
        self.textbox.Dock=DockStyle.Fill


        toolbar.Buttons.Add(openb)
        toolbar.ButtonClick+=self.OnClicked


        self.CenterToScreen()

    # @staticmethod
    def OnClicked(self, sender, event=None):
        MessageBox.Show ("Test")
        dialog = OpenFileDialog()
        dialog.Filter="C# files(*.cs)|*.cs"

        if dialog.ShowDialog() == DialogResult.OK:
            #dialog.ShowDialog()
            f=open(dialog.FileName)
            data=f.read()
            f. Close()
            self.textbox.Text=data


Application.Run (IForm())

python

2022-09-30 18:03

1 Answers

Invoking another thread from the event worked.
When calling the .Net framework from python, I don't know how to handle Windows message queues or how events relate to UI threads, so I can't supplement why it works...

import clr
clr.AddReference("System.Windows.Forms")
clr.AddReference("System.Drawing")

from System.Windows.Forms import Application,Form,TextBox
from System.Windows.Forms import ToolBar, ToolBarButton, OpenFileDialog, MessageBox

from System.Windows.Forms import DialogResult, ScrollBars, DockStyle, IWin32 Window
import threading

class IForm (Form):

    def__init__(self):
        self.Text="OpenDialog"

        toolbar=ToolBar()
        toolbar.Parent=self
        openb=ToolBarButton ("OpenDialog")

        self.textbox=TextBox()
        self.textbox.Parent=self
        self.textbox.Multiline=True
        self.textbox.ScrollBars=ScrollBars.Both
        self.textbox.WordWrap=True 
        self.textbox.Parent=self
        self.textbox.Dock=DockStyle.Fill

        toolbar.Buttons.Add(openb)
        toolbar.ButtonClick+=self.OnClicked

        self.CenterToScreen()

    # @staticmethod
    def OnClicked(self, sender, event=None):
        # Threading
        t=threading.Thread(target=self.selectFile)
        t.start()

    def selectFile(self):
        dialog = OpenFileDialog()
        dialog.Filter="C# files(*.cs)|*.cs"

        if dialog.ShowDialog(self) == DialogResult.OK:
            #dialog.ShowDialog()
            f=open(dialog.FileName)
            data=f.read()
            f.close()
            self.textbox.Text=data

Application.Run (IForm())

2022-09-30 18:03

If you have any answers or tips

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