OOB Navigation Error - Arg_TargetInvocationException

Question

I have a Silverlight 4 application built off the Silverlight Business Application template. On one view I have a comboBox that I have page names loaded into for navigation to other views.

 <ComboBox Name="cbNav" Height="27" Width="150" Margin="10,6,0,6" FontSize="11" FontWeight="Bold">
                    <ComboBoxItem Content="Admin Links" IsSelected="True"/>
                    <ComboBoxItem Content="Site Notes" />
                    <ComboBoxItem Content="Site List"/>
                    <ComboBoxItem Content="Customer List"/>
                    <ComboBoxItem Content="Group Admin"/>
                    <ComboBox.Effect>
                        <DropShadowEffect/>
                    </ComboBox.Effect>
                </ComboBox>

Here is the code behind:

  Private Sub cbNav_SelectionChanged(sender As System.Object, e As System.Windows.Controls.SelectionChangedEventArgs) Handles cbNav.SelectionChanged
        If cbNav.SelectedIndex > 0 Then
 
            If cbNav.SelectedIndex = 1 Then
                objApp.gvTitle = "Site Notes"
                NavigationService.Navigate(New Uri("/Management/Notes", UriKind.Relative)) 'Notes
            End If
 
            If cbNav.SelectedIndex = 2 Then
                objApp.gvTitle = "Site List"
                NavigationService.Navigate(New Uri("/Management/MSites", UriKind.Relative)) 'Site List
            End If
 
            If cbNav.SelectedIndex = 3 Then
                objApp.gvTitle = "Customer List"
                NavigationService.Navigate(New Uri("/Management/MCustomer", UriKind.Relative)) 'Customer List
            End If
 
            If cbNav.SelectedIndex = 4 Then
                objApp.gvTitle = "Equipment History Groups"
                NavigationService.Navigate(New Uri("/Management/MEquipmentMapAdmin", UriKind.Relative)) 'Customer List
            End If
 
        End If
    End Sub

Everything works great in browser, but when I try to run it OOB I get a Arg_TargetInvocationError, but only when I 

select the Site List entry that navigates to /Management/MSites. The other pages load fine

I have other simular applications that run fine OOB, but I can't figure out what it different about this one.

Answer 1

Hi chasday,

Welcome to Silverlight Forum!

According to your description, the project can work well in browser but not in OOB. I have tried to reproduce your issue, but it works well. In order to resolve your issue, could you set some breakpoints at the code below:

  NavigationService.Navigate(New Uri("/Management/Notes", UriKind.Relative)) 'Notes

And

 NavigationService.Navigate(New Uri("/Management/MSites", UriKind.Relative)) 'Site List

Then compare the difference of the result. Besides, please whether the url /Management/MSites exists.

 If it doesn't help you, please try to catch the exceptions as follows:

1. Open Visual Studio and click Debug menu->Exceptions.

2. Check "Common Language Runtime Exceptions".

In this way,  the debugger will stop when an exception is thrown. 

Best wishes, 

Answer 2

Cathrine,

Thanks for the detailed response. I wasn't able to use your suggestions because I couldn't get the sllauncher command to work so that I could debug it in OOB mode.

As a work a round I resorted to commenting out the code until the view loaded, then see what broke it. It turned out I used a

Dim m As HtmlElement = HtmlPage.Document.GetElementById("MyIFrame")

 statement so that I could reference an Iframe on the host page and that crashed the page when running OOB. I solved this by using

 If App.Current.IsRunningOutOfBrowser Then
 Else
    Dim m As HtmlElement = HtmlPage.Document.GetElementById("MyIFrame")
 End If

 and everything worked fine.

 

Answer 3

Hi chasday,

Very glad to hear that you have resolved your issue and thank you for sharing your solution.