AR3 => AR12: System.NullReferenceException when running MyBase.Run()

Posted by: lesauthjenthu on 29 July 2019, 2:58 am EST

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lesauthjenthu
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Posted 29 July 2019, 2:58 am EST

Hi, when I upgrade from AR 3 to AR 12 this method “MyBase.Run()” throw exception: System.NullReferenceException

How I can debug or check where is the problem
mohitg
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Posted 29 July 2019, 5:51 am EST

Hello,

Will you please share the full stack trace of the problem so that I can analyze the issue. Also, are you assigning the Null value to your SubReport control?

Is it possible for you to send us the stripped-down application so that I can replicate the issue at our end?

Thanks.

lesauthjenthu

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Posted 30 July 2019, 3:21 am EST

@mohitg

sorry I can just give you stack trace

   Location GrapeCity.ActiveReports.Document.Section.PagesCollection.Clear()
   Location GrapeCity.ActiveReports.Document.SectionDocument.#2d()
   Location GrapeCity.ActiveReports.SectionReport.ProcessInit(Boolean bDelayedInit)
   Location GrapeCity.ActiveReports.SectionReport.Run(Boolean syncDocument)
   Location GrapeCity.ActiveReports.SectionReport.Run()
   Location A.Run() Location A.vb:line 174
   Location B.KeyDown(Object sender, KeyEventArgs e) Location B.vb:line 672
   Location C.Seikyusyo_KeyDown(Object sender, KeyEventArgs e) Location C.xaml.vb:line 62
   Location System.Windows.Input.KeyEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   Location System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   Location System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   Location System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   Location System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   Location System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   Location System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   Location System.Windows.Input.InputManager.ProcessStagingArea()
   Location System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   Location System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   Location System.Windows.Interop.HwndKeyboardInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawKeyboardActions actions, Int32 scanCode, Boolean isExtendedKey, Boolean isSystemKey, Int32 virtualKey)
   Location System.Windows.Interop.HwndKeyboardInputProvider.ProcessKeyAction(MSG& msg, Boolean& handled)
   Location System.Windows.Interop.HwndSource.CriticalTranslateAccelerator(MSG& msg, ModifierKeys modifiers)
   Location System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param)
   Location System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   Location System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   Location System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   Location System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
   Location System.Windows.Interop.HwndSource.OnPreprocessMessageThunk(MSG& msg, Boolean& handled)
   Location System.Windows.Interop.HwndSource.WeakEventPreprocessMessage.OnPreprocessMessage(MSG& msg, Boolean& handled)
   Location System.Windows.Interop.ThreadMessageEventHandler.Invoke(MSG& msg, Boolean& handled)
   Location System.Windows.Interop.ComponentDispatcherThread.RaiseThreadMessage(MSG& msg)
   Location System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   Location System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   Location System.Windows.Window.ShowHelper(Object booleanBox)
   Location System.Windows.Window.Show()
   Location System.Windows.Window.ShowDialog()

mohitg
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Posted 30 July 2019, 5:03 am EST

Hello,

Are you using the "pagescollection.clear() " method somewhere in your section report event?

Could you please check after commenting the “pagescollection.clear()” line method.

Thanks.
lesauthjenthu
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Posted 30 July 2019, 5:38 am EST
No i’m not using this method

Here is the code where is exception throw

Private Sub Print() Me.DataSource = SetDataSource() MyBase.Run() 'error here End Sub
lesauthjenthu
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Posted 30 July 2019, 10:39 pm EST - Updated 30 September 2022, 5:39 pm EST

I think maybe error around pagescollection, but I can’t find where using it

2560×1400 156 KB
mohitg
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Posted 31 July 2019, 3:09 am EST
Hello,

From the following line of code:

Private Sub Print() Me.DataSource = SetDataSource() MyBase.Run() 'error here End Sub

I am assuming that you are using the inherited section report. In which event do you call the “Print” method? Can you shift the “Me.DataSource = SetDataSource()” line in the Report_Start event.

Also, Could you please remove the “MyBase.Run” method from the “Print” method. check the result.

Also, why are you use the “MyBase.Run” method inside the child class?

Thanks.

lesauthjenthu

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Posted 31 July 2019, 5:42 am EST

yes this print method inside Public Overloads Sub Run() Implements ILayout.Run

I have a controller print many report, each report Implements Run()

I just modified code of other dev so I don’t know this code much, here is code:

Public Sub KeyDown(ByVal sender As Object, ByVal e As System.Windows.Input.KeyEventArgs)
	For Each objLayout As ILayout In Me.LayoutList
		.....
		objLayout.Run()
		.......
	Next 
End Sub


Public Overloads Sub Run() Implements ISeikyuLayout.Run
	......
	If flag = True Then
		PrintA()
	End If
End Sub

Private Sub PrintA()
	Me.DataSource = SetDataSource()

	MyBase.Run() 'error here
	
	Dim layout2 As New arLayout2
	layout2.DataSource = SummaryOutputData2()
	layout2.Run()

	MyBase.Document.Pages.AddRange(layout2.Document.Pages) 'If comment out MyBase.Run(), here error too
	'maybe problem around PagesCollection, log below
End Sub

   Location GrapeCity.ActiveReports.Document.Section.PagesCollection.Add(Page value)
   Location GrapeCity.ActiveReports.Document.Section.PagesCollection.AddRange(PagesCollection pages)
   Location arLayout.PrintA Location arLayout.vb:line 195
   Location arLayout.Run() Location arLayout.vb:line 163
   Location A.KeyDown(Object sender, KeyEventArgs e) Location A.vb:line 672
   Location System.Windows.Input.KeyEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   Location System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   Location System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   Location System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   Location System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   Location System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   Location System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   Location System.Windows.Input.InputManager.ProcessStagingArea()
   Location System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   Location System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   Location System.Windows.Interop.HwndKeyboardInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawKeyboardActions actions, Int32 scanCode, Boolean isExtendedKey, Boolean isSystemKey, Int32 virtualKey)
   Location System.Windows.Interop.HwndKeyboardInputProvider.ProcessKeyAction(MSG& msg, Boolean& handled)
   Location System.Windows.Interop.HwndSource.CriticalTranslateAccelerator(MSG& msg, ModifierKeys modifiers)
   Location System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param)
   Location System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   Location System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   Location System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   Location System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
   Location System.Windows.Interop.HwndSource.OnPreprocessMessageThunk(MSG& msg, Boolean& handled)
   Location System.Windows.Interop.HwndSource.WeakEventPreprocessMessage.OnPreprocessMessage(MSG& msg, Boolean& handled)
   Location System.Windows.Interop.ThreadMessageEventHandler.Invoke(MSG& msg, Boolean& handled)
   Location System.Windows.Interop.ComponentDispatcherThread.RaiseThreadMessage(MSG& msg)
   Location System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   Location System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   Location System.Windows.Window.ShowHelper(Object booleanBox)
   Location System.Windows.Window.Show()
   Location System.Windows.Window.ShowDialog()

mohitg
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Posted 31 July 2019, 5:45 am EST

Hello,

Will you share all reports and classes related to this. So that I can analyze the code at my end.

You can upload the project at the following link:

https://www.dropbox.com/request/pprgRUGcO6evALDBlZUj

Thanks.

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