System.ExecutionEngineException issue when loading a WPF window from Windows Form

Question

I found a rather strange behavior ...

Here's how to replicate the problem:

Create a WPF application project.
Remove StartupUri from the App.xaml file.
Add a launch event handler to the application with the signature " private void Application_Startup(object sender, StartupEventArgs e)"
Now add a form to the project (right-click and select a new element).
in the Application_Startup method, create a form object and show it as Form1 f1 = new Form1(); f1.ShowDialog();
In real Form1, add a button to the constructor and add a click event handler to the button.
Add a new WPF window to your Window1 project.
In the Form1 event handler created in step 6, add lines of code to create the WPF window: Window1 w1 = new Window1(); w1.Show();
Run the project and click on the winform button to display the WPF window ... works fine so far.
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+5

1

fubaar · Accepted Answer · 2009-02-06T16:33:06+0000

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