Regarding Silverlight and prism

Question

i am developing a sample using silverlight5 and prism4. When i run my application i am getting th following exception

"Inheritance security rules violated while overriding member: 'System.Exception.get_InnerException()'. Security accessibility of the overriding method must match the security accessibility of the method being overriden."

and the stack trace is as follows

at System.ComponentModel.Composition.Hosting.ImportEngine.PartManager.TryOnComposed() at System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImportsStateMachine(PartManager partManager, ComposablePart part) at System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImports(PartManager partManager, ComposablePart part, Boolean shouldTrackImports) at System.ComponentModel.Composition.Hosting.ImportEngine.SatisfyImports(ComposablePart part) at System.ComponentModel.Composition.Hosting.ComposablePartExportProvider.<>c_DisplayClass2.b_0() at System.ComponentModel.Composition.Hosting.CompositionServices.TryInvoke(Action action) at System.ComponentModel.Composition.Hosting.ComposablePartExportProvider.Compose(CompositionBatch batch) at System.ComponentModel.Composition.Hosting.CompositionContainer.Compose(CompositionBatch batch) at System.ComponentModel.Composition.AttributedModelServices.ComposeExportedValue[T](CompositionContainer container, T exportedValue) at Microsoft.Practices.Prism.MefExtensions.MefBootstrapper.RegisterBootstrapperProvidedTypes() at Microsoft.Practices.Prism.MefExtensions.MefBootstrapper.ConfigureContainer() at Microsoft.Practices.Prism.MefExtensions.MefBootstrapper.Run(Boolean runWithDefaultConfiguration) at Microsoft.Practices.Prism.Bootstrapper.Run() at Honeywell.CIU888.Shell.App.Application_Startup(Object sender, StartupEventArgs e) at MS.Internal.CoreInvokeHandler.InvokeEventHandler(UInt32 typeIndex, Delegate handlerDelegate, Object sender, Object args) at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName, UInt32 flags)

anybody help in this.

Below is my code,

BootStrapper.cs

public class BootStrapper : MefBootstrapper
{

    protected override void InitializeShell()
    {
        base.InitializeShell();

        Application.Current.RootVisual = (UIElement)Shell;
    }

    protected override DependencyObject  CreateShell()
    {
        return Container.GetExportedValue<MainPage>();           
    }                    

    protected override void ConfigureAggregateCatalog()
    {            
        base.ConfigureAggregateCatalog();

        AggregateCatalog.Catalogs.Add(new AssemblyCatalog(this.GetType().Assembly));                    
    }

    protected override IModuleCatalog CreateModuleCatalog()
    {

    }
}

app.xaml.cs

public partial class App : Application {

    public App()
    {
        this.Startup += this.Application_Startup;
        this.Exit += this.Application_Exit;
        this.UnhandledException += this.Application_UnhandledException;

        InitializeComponent();
    }

    private void Application_Startup(object sender, StartupEventArgs e)
    {
        //this.RootVisual = new MainPage();
        (new BootStrapper()).Run();
    }

    private void Application_Exit(object sender, EventArgs e)
    {

    }

    private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
    {
        // If the app is running outside of the debugger then report the exception using
        // the browser's exception mechanism. On IE this will display it a yellow alert 
        // icon in the status bar and Firefox will display a script error.
        if (!System.Diagnostics.Debugger.IsAttached)
        {

            // NOTE: This will allow the application to continue running after an exception has been thrown
            // but not handled. 
            // For production applications this error handling should be replaced with something that will 
            // report the error to the website and stop the application.
            e.Handled = true;
            Deployment.Current.Dispatcher.BeginInvoke(delegate { ReportErrorToDOM(e); });                
        }
    }

    private void ReportErrorToDOM(ApplicationUnhandledExceptionEventArgs e)
    {
        try
        {
            string errorMsg = e.ExceptionObject.Message + e.ExceptionObject.StackTrace;
            errorMsg = errorMsg.Replace('"', '\'').Replace("\r\n", @"\n");

            System.Windows.Browser.HtmlPage.Window.Eval("throw new Error(\"Unhandled Error in Silverlight Application " + errorMsg + "\");");
        }
        catch (Exception)
        {
        }
    }
}

above Exception is coming if i call bootsrapper.run().

also i am running my project in "Elevated trust when running in browser" mode and signed xap file.

Gone Coding Gone Coding · Accepted Answer · 2011-11-16T10:35:39

"Security attributes need to be re-applied on types that derive from other types that also have security attributes"

Basically if you derive from a class that has security attributes applied (e.g. [SecurityCritical], you must repeat those attributes on any overriding members/methods.

If you can provide the relevant code it will be easier to explain, but you can always use DotPeek to examine the code of the base classes (if you do not have the source handy) as that will show the attributes.

Regarding Silverlight and prism

BootStrapper.cs

app.xaml.cs

1 Answers