Extended WebBrowser Control Series: WebBrowser Control and window.Close()

I had previously posted an extended version of the WebBrowser Control. This code posted in Opening Popup in a NewWindow and NewWindow2 Events in the C# WebBrowserControl, dealt with some issues when you want to have a form with a WebBrowser and in the enclosed page you have a Javascript code like:

window.open(“ <some url to a page”)

But recently another problem arised. What if you have a Javascript snippet like:


OMG!!! Why haven’t I thought about it. Well Kelder wrote me about this problem and he also sent me some of his\her research results:

Solution (Add WebBrowser as unmanaged code):  blogs.msdn.com/jpsanders/archive/2008/04/23/window-close-freezes-net-2-0-webbrowser-control-in-windows-form-application.aspx

Solution (Add WebBrowser using WM_NOTIFYPARENT override):blogs.msdn.com/jpsanders/archive/2007/05/25/how-to-close-the-form-hosting-the-webbrowser-control-when-scripting-calls-window-close-in-the-net-framework-version-2-0.aspx


Solution (Implementation not detailed): social.msdn.microsoft.com/forums/en-US/winforms/thread/1199c004-9eb2-400d-a118-6e06bca9f1f0/

Proposes changing pop-up links to WebBrowser navigate: dotnetninja.wordpress.com/2008/02/26/prevent-opening-new-window-from-webbrowser-control/Close

problem observed (no solution):www.codeproject.com/KB/cpp/ExtendedWebBrowser.aspx

It seams to me that the better solution is to use jpsanders solution, so I created an ExtendWebBrowser_v2 (the following is the modified fragment):

//Extend the WebBrowser control
public class ExtendedWebBrowser : WebBrowser
    // Define constants from winuser.h
    private const int WM_PARENTNOTIFY = 0x210;
    private const int WM_DESTROY = 2;
    AxHost.ConnectionPointCookie cookie;
    WebBrowserExtendedEvents events;

    protected override void WndProc(ref Message m)
        switch (m.Msg)
            case WM_PARENTNOTIFY:
             if (!DesignMode) 
                if (m.WParam.ToInt32() == WM_DESTROY) 
                    Message newMsg = new Message();
                    newMsg.Msg = WM_DESTROY;
                    // Tell whoever cares we are closing
                    Form parent = this.Parent as Form;
                    if (parent!=null)
            DefWndProc(ref m);
            base.WndProc(ref m);

The problem that might arise with this solution is that the parent might not be a Form but an user control, etc. For a more general aproach I think I should send a WM_DESTROY directly to the parent, but for most cases it works. I’m attaching the code and a sample page called test0.htm. I hope this helps and rembember you can always donate to programming geeks jejejejeje just kidding