Problem when loading XAP file dynamically in during the runtime.-Collection of common programming errors

Hi all,

I am developing an application with multiple XAP files. I have two XAP filesc – A.xap and B.xap.

I am loading A.xap first and want to load B.xap dynamically. But it results in an exception – “Exception has been thrown by the target of an invocation.” at the line marked as bold and italics.

I pasting below the code I am using and the exception details that I got.

Code

——-

private void btnLogin_Click(object sender, RoutedEventArgs e)

{

CallSharepointSvcClient loginSvc = new CallSharepointSvcClient();loginSvc.IsAuthenticatedCompleted += new EventHandler(loginSvc_IsAuthenticatedCompleted);

loginSvc.IsAuthenticatedAsync(txtUID.Text, txtPwd.Password);

}

void loginSvc_IsAuthenticatedCompleted(object sender, IsAuthenticatedCompletedEventArgs e)

{

if (e.Result == “Authorized”)

{

WebClient wb = new WebClient();

wb.OpenReadAsync(

new Uri(“B.xap”,UriKind.Relative));

wb.OpenReadCompleted +=

new OpenReadCompletedEventHandler(wb_OpenReadCompleted);

}

}

void wb_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)

{

StreamResourceInfo sri = new StreamResourceInfo(e.Result, null); StreamResourceInfo mainAppSRI = Application.GetResourceStream(sri, new Uri(“B.dll”, UriKind.Relative));AssemblyPart loader = new AssemblyPart(); Assembly assembly = loader.Load(mainAppSRI.Stream);this.LayoutRoot.Children.Clear(); this.Content = assembly.CreateInstance(“B.Page”) as System.Windows.UIElement;

}

The exception detais – Stack trace

System.Reflection.TargetInvocationException was unhandled by user code   Message=”Exception has been thrown by the target of an invocation.”   StackTrace:        at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck)        at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache)        at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache)        at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly)        at System.Activator.CreateInstance(Type type, Boolean nonPublic)        at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)        at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)        at System.Reflection.Assembly.CreateInstance(String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)        at System.Reflection.Assembly.CreateInstance(String typeName)        at LoginApp.Page.wb_OpenReadCompleted(Object sender, OpenReadCompletedEventArgs e)        at System.Net.WebClient.OnOpenReadCompleted(OpenReadCompletedEventArgs e)        at System.Net.WebClient.OpenReadOperationCompleted(Object arg)   InnerException: System.IO.FileNotFoundException        Message=”Could not load file or assembly ‘CairngormFramework, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’ or one of its dependencies. The system cannot find the file specified.”        StackTrace:             at VideoLibrary.Page..ctor()        InnerException:

Please throw some light into this matter and help me.

Thanks,

Hi,

I figured out the problem. There was two dependencies for my project. I had to load them  manually before creating the instance of the main page. That was the problem.

Thanks,

Hi,

Thank u for the reply. I tried that as well with the following code…

string appManifest = new StreamReader(Application.GetResourceStream(new StreamResourceInfo(e.Result, null), new Uri(“AppManifest.xaml”, UriKind.Relative)).Stream).ReadToEnd();XElement deploymentRoot = XDocument.Parse(appManifest).Root; List deploymentParts = (from assemblyParts in deploymentRoot.Elements().Elements()select assemblyParts).ToList();UIElement dashShell = null; foreach (XElement xElement in deploymentParts)

{

string source = xElement.Attribute(“Source”).Value;StreamResourceInfo streamInfo = Application.GetResourceStream(new StreamResourceInfo(e.Result, “application/binary”), new Uri(source, UriKind.Relative));AssemblyPart asmPart = new AssemblyPart();if (source == “VideoLibrary.dll”)

{

Assembly asm = asmPart.Load(streamInfo.Stream);

dashShell = asm.CreateInstance(

“VideoLibrary.Page”) as UIElement;

}

else

{

asmPart.Load(streamInfo.Stream);

}

}

this.LayoutRoot.Children.Clear(); this.LayoutRoot.Children.Add(dashShell);

But the line which is marked in bold and italics creates the same problem.

If anybody could provide a light into this…

Thanks

Hi,

I figured out the problem. There was two dependencies for my project. I had to load them  manually before creating the instance of the main page. That was the problem.

Thanks,