WPF root element is not valid for navigation

Question

I am converting a WPF XBAP app to a WPF desktop app. I have it running on the desktop, but am now trying to change the Page references to Window references.

Answer 1

Its not entirely accurate about it not being possible to host a window in a frame, the following code will do it for you

    public void HostWindowInFrame(Frame fraContainer, Window win) {
        object tmp = win.Content;
        win.Content = null;
        fraContainer.Content = new ContentControl() { Content = tmp };
    }

Answer 2

Navigation in a WPF application can only be done between pages. The error shows up because you're trying to "navigate" to what is now a Window, and this isn't possible.

Instead of converting your Page into a Window, create a new Window with a Frame control in it. A Frame can be used to host your existing pages - which should stay exactly as they are, and not be changed into Windows.

Answer 3

please check StartForm having the page as root element or some other else. I am having the same. I have check the page which has to be navigated. I declare that page as window.