Wpf – How to suppress script errors when using the WPF WebBrowser control

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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.

Best Answer

Here is a solution i just made with reflection. Solves the issue :) I run it at the Navigated event, as it seems the activeX object is not available until then.

What it does is set the .Silent property on the underlying activeX object. Which is the same as the .ScriptErrorsSuppressed property which is the Windows forms equivalent.

 public void HideScriptErrors(WebBrowser wb, bool Hide) {
    FieldInfo fiComWebBrowser = typeof(WebBrowser).GetField("_axIWebBrowser2", BindingFlags.Instance | BindingFlags.NonPublic);
    if (fiComWebBrowser == null) return;
    object objComWebBrowser = fiComWebBrowser.GetValue(wb);
    if (objComWebBrowser == null) return;
    objComWebBrowser.GetType().InvokeMember("Silent", BindingFlags.SetProperty, null, objComWebBrowser, new object[] { Hide });
 }

A better version that can be run anytime and not after the .Navigated event:

public void HideScriptErrors(WebBrowser wb, bool hide) {
    var fiComWebBrowser = typeof(WebBrowser).GetField("_axIWebBrowser2", BindingFlags.Instance | BindingFlags.NonPublic);
    if (fiComWebBrowser == null) return;
    var objComWebBrowser = fiComWebBrowser.GetValue(wb);
    if (objComWebBrowser == null) {
        wb.Loaded += (o, s) => HideScriptErrors(wb, hide); //In case we are to early
        return;
    }
    objComWebBrowser.GetType().InvokeMember("Silent", BindingFlags.SetProperty, null, objComWebBrowser, new object[] { hide });
}

If any issues with the second sample, try swapping wb.Loaded with wb.Navigated.

Related Solutions

Wpf – Changing “active content” security settings on WPF WebBrowser control

We eventually found a decent solution to this, although I still wish there were some sort of settings on the control itself. To load the documents, we just set browser.Source to be the following:

file://127.0.0.1/c$/path/to/the/file (where the path is an absolute path without C:\, for example, c$/Users/jschuster/mydocument.html)

For whatever reason, the control will display files referenced by a URL in that format without a warning.

C# – WPF WebBrowser control – how to suppress script errors

Here is a C# routine that is capable of putting WPF's WebBrowser in silent mode. You can't call it at WebBrowser initialization as it 's too early, but instead after navigation occured. Here is a WPF sample app with a wbMain WebBrowser component:

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
        wbMain.Navigated += new NavigatedEventHandler(wbMain_Navigated);
    }

    void wbMain_Navigated(object sender, NavigationEventArgs e)
    {
        SetSilent(wbMain, true); // make it silent
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        wbMain.Navigate(new Uri("... some url..."));
    }
}


public static void SetSilent(WebBrowser browser, bool silent)
{
    if (browser == null)
        throw new ArgumentNullException("browser");

    // get an IWebBrowser2 from the document
    IOleServiceProvider sp = browser.Document as IOleServiceProvider;
    if (sp != null)
    {
        Guid IID_IWebBrowserApp = new Guid("0002DF05-0000-0000-C000-000000000046");
        Guid IID_IWebBrowser2 = new Guid("D30C1661-CDAF-11d0-8A3E-00C04FC9E26E");

        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)]
private interface IOleServiceProvider
{
  [PreserveSig]
  int QueryService([In] ref Guid guidService, [In] ref Guid riid, [MarshalAs(UnmanagedType.IDispatch)] out object ppvObject);
}

Best Answer

Related Solutions

Wpf – Changing “active content” security settings on WPF WebBrowser control

C# – WPF WebBrowser control – how to suppress script errors

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