Question

I added to my WindowsForm app a new WPF window called novoLogin.

After adding it, I added the system.xaml reference….debug fine.

Now I’m trying to open this new window from the existing windowsForm.

novoLogin nl = new novoLogin();
nl.show();

The compiler is giving this error:

Error 1 ‘WindowsFormsApplication1.novoLogin’ does not contain a
definition for ‘show’ and no extension method ‘show’ accepting a first
argument of type ‘WindowsFormsApplication1.novoLogin’ could be found
(are you missing a using directive or an assembly reference?)

Answer 1

This brief article explains how you can achieve this.

If you find yourself in need to open a WPF Window from a WinForms program, this is one way to do it (works for me):

1. Create/Add a new project of type WPF Custom Control Library
2. Add a new Item of type Window (WPF)
3. Do your thing with the WPF Window

4. From your WinForms app, create and open the WPF Window

   using System;  
   using System.Windows.Forms;  
   using System.Windows.Forms.Integration;  
   
   var wpfwindow = new WPFWindow.Window1(); 
   ElementHost.EnableModelessKeyboardInterop(wpfwindow); 
   wpfwindow.Show();