After Browser Refresh, all actions on SilverlightApp throws error

[Yogesh]

I am doing Silverlight application test automation. All looks fine, but moment I do browser refresh (or if certain button click in app does page refresh) all commands followed by the page refresh ends up in Exception

manager.Start(); // Start the manager

manager.LaunchNewBrowser(); // Launch a new browser instance.

manager.ActiveBrowser.Window.Maximize();

manager.ActiveBrowser.NavigateTo(TestConfigs.BaseUrl);

app = manager.ActiveBrowser.SilverlightApps()[0];

manager.ActiveBrowser.Refresh();
Thread.Sleep(5000);

app.RefreshVisualTrees();    // Here it throws following exception

{"ExecuteCommand failed!\r\nInError set by the client. Client Error:\r\nSystem.NullReferenceException: Object reference not set to an instance of an object.\r\n   at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)\r\n   at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)\r\n   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessSilverlightCommand(BrowserCommand request)\r\n   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)\r\nBrowserCommand (Type:'Silverlight',Info:'NotSet',Action:'NotSet',Target:'ElementId (tagName: 'object',occurrenceIndex: '0')',Data:'{\"Method\":null,\"Property\":null,\"Reference\":null,\"Reference2\":null,\"Type\":12,\"Value\":null}',ClientId:'Client_079a5f6e-e58f-4682-94c6-ac9a1cf9345b',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'System.NullReferenceException: Object reference not set to an instance of an object.\r\n   at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)\r\n   at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)\r\n   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessSilverlightCommand(BrowserCommand request)\r\n   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)')\r\nInnerException: none.\r\n"}

Any idea whats going wrong here ?

Regards !

Yogesh

[Boyan Boev]

Hi Yogesh,

Thank you for contacting us.

Could you please grant us an access to the page, so we can try to reproduce and debug this issue.

Hope to hear from you soon.

Regards,
Boyan Boev
Telerik

[Yogesh]

Hi,

You can navigate to *link* and load silverlight app and click on language (or just do browser refresh as explicit step) which refreshes the page and then all actions on Silverlight app throws error.

Regards !

[Yogesh]

Admin, could you remove application page link (or put some fake link) after you got it? Thank You

[Boyan Boev]

Hello Yogesh,

This is caused by the EnableHtmlAccess property being disabled at compile-time. EnableHtmlAccess must be enabled for Test Studio to automate against a Silverlight App. This change can be made in the Silverlight app manifest (point 6 in this article). The 'EnableHtmlAccess' parameter needs to be set to true in our app.

I have attached a screenshot to show you our demo SL app.

Please consult this with your developers and let us know the result.

Hope to hear from you soon.

Regards,
Boyan Boev
Telerik