Multiple WPF applications in the same AppDomain

Question

I got following setup:

WPF_Application.exe

and

a DLL that contains a WinForms Window and an WPF Window.

The 'WPF_Application.exe' calls the WinForms window from the DLL and the WinForms Window creates an instance of the WPF window in the DLL.

That creates following exception:

Cannot create more than one System.Windows.Application instance in the same AppDomain.

Tried different things, but couldn't figure out how to fix it.

Answer 1

I fixed it by asigning the Application of the wpf window that is called to the Application.Current Window:

  if (Application.Current == null)
  {
       MyApplication = new Application
       {
          ShutdownMode = ShutdownMode.OnExplicitShutdown
       };
   }
   else
       MyApplication = Application.Current;