How do I suppress script errors when using the WPF WebBrowser control?

user_22702 0
Viewed 53008

I have a WPF application that uses the WPF WebBrowser control to display interesting web pages to our developers on a flatscreen display (like a news feed).

The trouble is that I occasionally get a HTML script error that pops up a nasty IE error message asking if I would like to "stop running scripts on this page". Is there a way to suppress this error checking?

NOTE: I have disabled script debugging in IE settings already.

browser wpf
9 Answers

Check the below code for suppressing script errors for WPF browser control..

    public MainWindow
    {
    InitializeComponent();
    WebBrowserControlView.Navigate(new Uri("https://www.hotmail.com"));
                        //The below checks for script errors.
    ViewerWebBrowserControlView.Navigated += ViewerWebBrowserControlView_Navigated;
    }

void ViewerWebBrowserControlView_Navigated(object sender, NavigationEventArgs e)
            {
    BrowserHandler.SetSilent(ViewerWebBrowserControlView, true); // make it silent
            }

public static class BrowserHandler
{
    private const string IWebBrowserAppGUID = "0002DF05-0000-0000-C000-000000000046";
    private const string IWebBrowser2GUID = "D30C1661-CDAF-11d0-8A3E-00C04FC9E26E";

    public static void SetSilent(System.Windows.Controls.WebBrowser browser, bool silent)
    {
        if (browser == null)
            MessageBox.Show("No Internet Connection");

        // get an IWebBrowser2 from the document
        IOleServiceProvider sp = browser.Document as IOleServiceProvider;
        if (sp != null)
        {
            Guid IID_IWebBrowserApp = new Guid(IWebBrowserAppGUID);
            Guid IID_IWebBrowser2 = new Guid(IWebBrowser2GUID);

            object webBrowser;
            sp.QueryService(ref IID_IWebBrowserApp, ref IID_IWebBrowser2, out webBrowser);
            if (webBrowser != null)
            {
                webBrowser.GetType().InvokeMember("Silent", BindingFlags.Instance | BindingFlags.Public | BindingFlags.PutDispProperty, null, webBrowser, new object[] { silent });
            }
        }
    }

}

[ComImport, Guid("6D5140C1-7436-11CE-8034-00AA006009FA"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleServiceProvider
{
    [PreserveSig]
    int QueryService([In] ref Guid guidService, [In] ref Guid riid, [MarshalAs(UnmanagedType.IDispatch)] out object ppvObject);


   }

Whereas, If you are using Winforms Web browser with winforms host.. you have a property "SuppressScriptErrors" set it to true

    <WindowsFormsHost Name="WinformsHost" Grid.Row="1">
    <winForms:WebBrowser x:Name="WebBrowserControlView" ScriptErrorsSuppressed="True" AllowWebBrowserDrop="False"></winForms:WebBrowser>
</WindowsFormsHost>
user_26524540

Wolf5's answer is good but if (objComWebBrowser == null) doesn't seem to work. Instead I check the WebBrowser instance for IsLoaded:

public void HideScriptErrors(WebBrowser webBrowser)
{
    if (!webBrowser.IsLoaded)
    {
        webBrowser.Loaded += WebBrowser_Loaded; // in case we are too early
        return;
    }

    var objComWebBrowser = typeof(WebBrowser).GetField("_axIWebBrowser2", BindingFlags.Instance | BindingFlags.NonPublic)?.GetValue(webBrowser);
    if (objComWebBrowser == null)
    {
        return;
    }

    objComWebBrowser.GetType().InvokeMember("Silent", BindingFlags.SetProperty, null, objComWebBrowser, new object[] { true });
}
private void WebBrowser_Loaded(object sender, RoutedEventArgs e)
{
    var webBrowser = sender as WebBrowser;
    webBrowser.Loaded -= WebBrowser_Loaded;
    HideScriptErrors(webBrowser);
}

It is also necessary to remove the Loaded event handler after the first time, as the control may be unloaded and loaded again several times when making it invisible by switching to a different tab. Also the if (!wb.Loaded)) fallback is still important when the WebBrowser is not visible yet on its first navigation, e.g. if it is on a different tab that is not visible on application startup.

user_57737330
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