Question

I have the following code:

Private Sub LocalizationComboBox_SelectionChanged(sender As Object, e As SelectionChangedEventArgs)
    Thread.CurrentThread.CurrentUICulture = TryCast(e.AddedItems(0), CultureInfo)
    Application.Current.SaveCulture()
    Application.Current.Refresh()
End Sub

And I’m implementing this later on:

Public NotInheritable Class ApplicationExtensions
Public Shared Sub Refresh(app As Application)
    DirectCast(HtmlPage.Window.GetProperty("location"), ScriptObject).Invoke("reload")
End Sub

Public NotInheritable Class ApplicationExtensions
    Private Sub New()
    End Sub
    Public Shared Sub Refresh(app As Application)
        DirectCast(HtmlPage.Window.GetProperty("location"), ScriptObject).Invoke("reload")
    End Sub

    Public Shared Sub LoadCulture(app As Application)
        Try
            If IsolatedStorageSettings.ApplicationSettings.Contains("language") Then
                Dim language = TryCast(IsolatedStorageSettings.ApplicationSettings("language"), String)
                If language IsNot Nothing Then
                    Thread.CurrentThread.CurrentUICulture = New CultureInfo(language)
                End If
            Else
                app.SaveCulture()
            End If
        Catch
            MessageBox.Show("Please, open Silverlight settings and enable Application Storage.")
        End Try
    End Sub

    Public Shared Sub SaveCulture(app As Application)
        Try
            IsolatedStorageSettings.ApplicationSettings("language") = Thread.CurrentThread.CurrentUICulture.Name
        Catch
            MessageBox.Show("Please, open Silverlight settings and enable Application Storage.")
        End Try
    End Sub
End Class

However, I get an error saying:

‘SaveCulture’ is not a member of ‘System.Windows.Application’
‘Refresh’ is not a member of ‘System.Windows.Application’
‘SaveCulture’ is not a member of ‘System.Windows.Application’

Can someone help me out with this?
Now I should mention that I have a C# version of this and that has no problems.

Thanks, y’all.

Answer 1

You are not following VB.NET extension method rules. Which dictates that:

• You must write the extension methods in a Module, not a Class
• They must have the <Extension> attribute
• The source code file that uses them must have an Imports statement for the module.

And VS2010 or higher is required. The MSDN Library article is here.