ArgumentExceptions and InvalidOperationExceptions when calling RadGridView.EndUpdate()

[Stephan]

Hello,

we have an application using Telerik version 2021.3.1123.40. It is not the first time these errors were reportet, but I have no methode to reproduce it at the moment. The chain of Events for both errors is, that RadGridView.FilterChanged-Event is called, from there we call our method "UpdateProzessschritte" (UpdateProcessSteps), which does a BeginUpdate and EndUpdate of the grid. When EndUpdate is called, the 2 errors orccured under certain, unknown conditions.

1. ERROR|TBM_HAProzessPlugin.MainForm|1|(null)| In Modul TBM|DNA - Digitaler Netzanschluss ist ein Fehler aufgetreten. System.InvalidOperationException: Die Auflistung wurde geändert. Der Enumerationsvorgang kann möglicherweise nicht ausgeführt werden.
      bei System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
      bei System.Collections.Generic.List`1.Enumerator.MoveNextRare()
      bei System.Collections.Generic.List`1.Enumerator.MoveNext()
      bei Telerik.WinControls.UI.DataGroup.<GetEnumerator>d__7.MoveNext()
      bei Telerik.WinControls.UI.GridViewGroupRowInfo.get_ChildRows()
      bei Telerik.WinControls.UI.GridViewRowInfo.HasChildRows()
      bei Telerik.WinControls.UI.GridTraverser.CanStepInHierarchy()
      bei Telerik.WinControls.UI.GridTraverser.StepInHierarchy()
      bei Telerik.WinControls.UI.GridTraverser.MoveNextCore()
      bei Telerik.WinControls.UI.GridTraverser.MoveNext()
      bei Telerik.WinControls.UI.GridTraverser.GoToRow(GridViewRowInfo row)
      bei Telerik.WinControls.UI.BaseGridNavigator.ProcessEventCore(GridViewEvent eventData)
      bei Telerik.WinControls.UI.BaseGridNavigator.Telerik.WinControls.UI.IGridViewEventListener.ProcessEvent(GridViewEvent eventData)
      bei Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(GridViewEvent gridEvent, PriorityWeakReferenceList list, GridEventProcessMode processMode)
      bei Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessEvent(GridViewEvent gridEvent)
      bei Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(GridViewEvent gridEvent)
      bei Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()
      bei Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewEvent gridEvent)
      bei Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewTemplate template, GridViewEvent eventData, Boolean postUI)
      bei Telerik.WinControls.UI.GridViewTemplate.DispatchEvent(GridViewEvent gridEvent, Boolean postUI)
      bei Telerik.WinControls.UI.GridViewTemplate.DispatchDataViewChangedEvent(Object sender, DataViewChangedEventArgs args)
      bei Telerik.WinControls.UI.GridViewTemplate.OnViewChanged(Object sender, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.MasterGridViewTemplate.OnViewChanged(Object sender, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.GridViewTemplate.EndUpdate(Boolean notify, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.MasterGridViewTemplate.EndUpdate(Boolean notify, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.GridViewTemplate.EndUpdate()
      bei Telerik.WinControls.UI.RadGridView.EndUpdate()
      bei TBM_HAProzessPlugin.MainForm.UpdateProzessschritte(RadGridView radGridView, RadDiagram radDiagram, Dictionary`2 prozessDauerListe, List`1 schritte) in C:\Program Files (x86)\Jenkins\jobs\TBM_DNA_Digitaler_Netzanschluss_WP\workspace\TBM_HAProzessPlugin\src\Forms\MainForm.cs:Zeile 510.
      bei TBM_HAProzessPlugin.MainForm.rgvHAAkten_FilterChanged(Object sender, GridViewCollectionChangedEventArgs e) in C:\Program Files (x86)\Jenkins\jobs\TBM_DNA_Digitaler_Netzanschluss_WP\workspace\TBM_HAProzessPlugin\src\Forms\MainForm.cs:Zeile 442.
   
   [Translation]: Collection was modified; enumeration operation may not execute
   
   
   
2. ERROR|TBM_HAProzessPlugin.MainForm|1|(null)| In Modul TBM|DNA - Digitaler Netzanschluss ist ein Fehler aufgetreten. System.ArgumentException: Ein Element mit dem gleichen Schlüssel wurde bereits hinzugefügt.
      bei System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
      bei System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
      bei System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
      bei Telerik.WinControls.Data.GroupBuilder`1.Perform(IReadOnlyCollection`1 items, Int32 level, Group`1 parent)
      bei Telerik.WinControls.Data.GroupBuilder`1.get_Groups()
      bei Telerik.WinControls.Data.RadDataView`1.get_Groups()
      bei Telerik.WinControls.UI.GridViewInfo.Refresh()
      bei Telerik.WinControls.UI.GridViewInfo.get_ChildRows()
      bei Telerik.WinControls.UI.GridViewTemplate.get_ChildRows()
      bei Telerik.WinControls.UI.ViewInfoTraverser.SetCollectionForStage(Boolean initializeCollection)
      bei Telerik.WinControls.UI.ViewInfoTraverser.ChangeCollectionForward()
      bei Telerik.WinControls.UI.ViewInfoTraverser.MoveNextCore()
      bei Telerik.WinControls.UI.ViewInfoTraverser.MoveNext()
      bei Telerik.WinControls.UI.GridTraverser.MoveNextCore()
      bei Telerik.WinControls.UI.GridTraverser.MoveNext()
      bei Telerik.WinControls.UI.GridTraverser.GoToRow(GridViewRowInfo row)
      bei Telerik.WinControls.UI.BaseGridNavigator.ProcessEventCore(GridViewEvent eventData)
      bei Telerik.WinControls.UI.BaseGridNavigator.Telerik.WinControls.UI.IGridViewEventListener.ProcessEvent(GridViewEvent eventData)
      bei Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(GridViewEvent gridEvent, PriorityWeakReferenceList list, GridEventProcessMode processMode)
      bei Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessEvent(GridViewEvent gridEvent)
      bei Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(GridViewEvent gridEvent)
      bei Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()
      bei Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewEvent gridEvent)
      bei Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewTemplate template, GridViewEvent eventData, Boolean postUI)
      bei Telerik.WinControls.UI.GridViewTemplate.DispatchEvent(GridViewEvent gridEvent, Boolean postUI)
      bei Telerik.WinControls.UI.GridViewTemplate.DispatchDataViewChangedEvent(Object sender, DataViewChangedEventArgs args)
      bei Telerik.WinControls.UI.GridViewTemplate.OnViewChanged(Object sender, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.MasterGridViewTemplate.OnViewChanged(Object sender, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.GridViewTemplate.EndUpdate(Boolean notify, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.MasterGridViewTemplate.EndUpdate(Boolean notify, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.GridViewTemplate.EndUpdate()
      bei Telerik.WinControls.UI.RadGridView.EndUpdate()
      bei TBM_HAProzessPlugin.MainForm.UpdateProzessschritte(RadGridView radGridView, RadDiagram radDiagram, Dictionary`2 prozessDauerListe, List`1 schritte) in C:\Program Files (x86)\Jenkins\jobs\TBM_DNA_Digitaler_Netzanschluss_WP\workspace\TBM_HAProzessPlugin\src\Forms\MainForm.cs:Zeile 510.
      bei TBM_HAProzessPlugin.MainForm.rgvHAAkten_FilterChanged(Object sender, GridViewCollectionChangedEventArgs e) in C:\Program Files (x86)\Jenkins\jobs\TBM_DNA_Digitaler_Netzanschluss_WP\workspace\TBM_HAProzessPlugin\src\Forms\MainForm.cs:Zeile 442.
   
   [Translation]: Item with Same Key has already been added

 

Do you have any ideas which causes could lead to this exceptions and how to fix it? Or is this a known problem which was already fixed in later versions?

[Dinko | Tech Support Engineer]

Hi Stephan,

Thank you for the provided stack trace. However, using only the trace I can't determine why this is happening on your side. I will need more information regarding your scenario so that I can try to reproduce it. Without reproducing this we cannot know what exactly to investigate and what exactly should be changed and how. 

In the past 2 years, we have fixed several exceptions in the control. For example: RadGridView: InvalidOperationException is thrown when a row is expanded and the AutoSize property is true. I am posting this as an example. I am not sure if this is related. However, the first step we need to do is to update our assemblies in the project to their latest version. This way we can check if these exceptions are fixed in one of the newer versions.

You can check the Download Product Files help article which shows how to navigate to the download page in your account. Try updating the assemblies and follow the same steps before the update to see if these exceptions occur again.

Regards,
Dinko | Tech Support Engineer
Progress Telerik

[Stephan]

Hello Dinko,

thanks for your fast reply. We discuss an Update on monday with our development team.

Our scenario is very complex. We use a custom group predicate to sort our groups by the status-field of the row, similar like your example mentionen here https://docs.telerik.com/devtools/winforms/controls/gridview/grouping/custom-grouping . We also enabled grouping. Seems like the error occured after changing and reloading a single entity, updating the bindinglist. After that the grid fired "OnFilterChanged".

I keep you updated next week.

Regards,

Stephan

[Dinko | Tech Support Engineer]

Thank you for considering the option to migrate to the latest version of our controls. In the meantime, I have tried to follow your steps. To simulate your scenario, I have created a sample project and bind the RadGridView to a BindingList. Custom group predicate is added and when the control is filtered, I am updating a value from the BindingList in the FilterChanged event wrapped in BeginUpdate() and EndUpdate() methods. So far I wasn't able to reproduce this exception. You could check my project and try to modify it to reproduce these exceptions and send it back to me for further investigation.

[Stephan]

Hello Dinko,

we decided to update our components, but that process will need some time. I am still trying to reproduce this error, but I wasn't able to do it for now.  

Regards,

Stephan

[Stephan]

Hello,

I know this topic is very old and it took us over a year to finally migrate to version 2025.1.211 of Telerik UI for Winforms. 

We still have issues with the grouping in the gridview. Here are two different Stacktraces that occur from time to time. I couldn't reproduce the error by now, but as far as I know is, that the error occured, when the grid is grouped (e.g. "Status" column) and the data is reloaded.

1. 2025-07-16 13:15:52,929|ERROR|TBM_HAProzessPlugin.MainForm|1|(null)| In Modul TBM|DNA - Digitaler Netzanschluss ist ein Fehler aufgetreten. System.ArgumentException: Ein Element mit dem gleichen Schlüssel wurde bereits hinzugefügt.
      bei System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
      bei System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
      bei System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
      bei Telerik.WinControls.Data.GroupBuilder`1.Perform(IReadOnlyCollection`1 items, Int32 level, Group`1 parent)
      bei Telerik.WinControls.Data.GroupBuilder`1.get_Groups()
      bei Telerik.WinControls.Data.RadDataView`1.get_Groups()
      bei Telerik.WinControls.UI.GridViewInfo.Refresh()
      bei Telerik.WinControls.UI.GridViewInfo.get_ChildRows()
      bei Telerik.WinControls.UI.GridViewTemplate.get_ChildRows()
      bei Telerik.WinControls.UI.ViewInfoTraverser.SetCollectionForStage(Boolean initializeCollection)
      bei Telerik.WinControls.UI.ViewInfoTraverser.ChangeCollectionForward()
      bei Telerik.WinControls.UI.ViewInfoTraverser.MoveNextCore()
      bei Telerik.WinControls.UI.ViewInfoTraverser.MoveNext()
      bei Telerik.WinControls.UI.GridTraverser.MoveNextCore()
      bei Telerik.WinControls.UI.GridTraverser.MoveNext()
      bei Telerik.WinControls.UI.GridTraverser.GoToRow(GridViewRowInfo row)
      bei Telerik.WinControls.UI.BaseGridNavigator.ProcessEventCore(GridViewEvent eventData)
      bei Telerik.WinControls.UI.BaseGridNavigator.Telerik.WinControls.UI.IGridViewEventListener.ProcessEvent(GridViewEvent eventData)
      bei Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(GridViewEvent gridEvent, PriorityWeakReferenceList list, GridEventProcessMode processMode)
      bei Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessEvent(GridViewEvent gridEvent)
      bei Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(GridViewEvent gridEvent)
      bei Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()
      bei Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewEvent gridEvent)
      bei Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewTemplate template, GridViewEvent eventData, Boolean postUI)
      bei Telerik.WinControls.UI.GridViewTemplate.DispatchEvent(GridViewEvent gridEvent, Boolean postUI)
      bei Telerik.WinControls.UI.GridViewTemplate.DispatchDataViewChangedEvent(Object sender, DataViewChangedEventArgs args)
      bei Telerik.WinControls.UI.GridViewTemplate.OnViewChanged(Object sender, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.MasterGridViewTemplate.OnViewChanged(Object sender, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.GridViewTemplate.EndUpdate(Boolean notify, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.MasterGridViewTemplate.EndUpdate(Boolean notify, DataViewChangedEventArgs e)
      bei Telerik.WinControls.UI.GridViewTemplate.EndUpdate()
      bei Telerik.WinControls.UI.RadGridView.EndUpdate()
      bei TBM_HAProzessPlugin.MainForm.UpdateProzessschritte(RadGridView radGridView, RadDiagram radDiagram, Dictionary`2 prozessDauerListe, List`1 schritte) in C:\JenkinsData\workspace\TBM_DNA_Digitaler_Netzanschluss_WP\TBM_HAProzessPlugin\src\Forms\MainForm.cs:Zeile 509.
      bei TBM_HAProzessPlugin.MainForm.rgvHAAkten_FilterChanged(Object sender, GridViewCollectionChangedEventArgs e) in C:\JenkinsData\workspace\TBM_DNA_Digitaler_Netzanschluss_WP\TBM_HAProzessPlugin\src\Forms\MainForm.cs:Zeile 441.
2. 2025-07-16 15:35:50,320|ERROR|TBM_HAProzessPlugin.WrappedPlugin_Impl|92|(null)| Es ist eine unbehandelte Ausnahme aufgetreten an 'AppDomain' 'Name:DefaultDomain
   Keine Kontextrichtlinien vorhanden.
   '.
   Die Anwendung muss beendet werden. System.Reflection.TargetInvocationException: Während des Vorgangs ist eine Ausnahme aufgetreten, sodass das Ergebnis ungültig ist. Weitere Ausnahmedetails finden Sie in InnerException. ---> System.ArgumentException: Ein Element mit dem gleichen Schlüssel wurde bereits hinzugefügt.
      bei System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
      bei System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
      bei System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
      bei Telerik.WinControls.Data.GroupBuilder`1.Perform(IReadOnlyCollection`1 items, Int32 level, Group`1 parent)
      bei Telerik.WinControls.Data.GroupBuilder`1.get_Groups()
      bei Telerik.WinControls.Data.RadDataView`1.get_Groups()
      bei Telerik.WinControls.UI.GridViewInfo.Refresh()
      bei Telerik.WinControls.UI.GridViewInfo.FindGroupParent(GridViewRowInfo rowInfo)
      bei Telerik.WinControls.UI.GridViewInfo.FindParent(GridViewRowInfo rowInfo)
      bei Telerik.WinControls.UI.GridViewRowInfo.get_Parent()
      bei Telerik.WinControls.UI.GridViewGroupRowInfo.get_Parent()
      bei Telerik.WinControls.UI.GridTraverser.StepOutOfHierarchy()
      bei Telerik.WinControls.UI.GridTraverser.MoveNextCore()
      bei Telerik.WinControls.UI.GridTraverser.MoveNext()
      bei Telerik.WinControls.UI.GridViewSearchRowInfo.TraverseRows(DoWorkEventArgs e)
      bei Telerik.WinControls.UI.GridViewSearchRowInfo.worker_DoWork(Object sender, DoWorkEventArgs e)
      bei System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
      bei System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
      --- Ende der internen Ausnahmestapelüberwachung ---
      bei System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary()
      bei Telerik.WinControls.UI.GridViewSearchRowInfo.worker_RunWorkerCompleted(Object sender, RunWorkerCompletedEventArgs e)
      bei System.ComponentModel.BackgroundWorker.OnRunWorkerCompleted(RunWorkerCompletedEventArgs e)
      bei System.ComponentModel.BackgroundWorker.AsyncOperationCompleted(Object arg)
      bei System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
      bei System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
      bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
      bei System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
      bei System.Threading.ThreadPoolWorkQueue.Dispatch()
      bei System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

Hope this helps to analyze the problem and maybe fix it in a future version.

Regards,

Stephan

 

[Dinko | Tech Support Engineer]

I appreciate sending the stack trace. However, it is not enough to understand why this exception is raised.

I would like to note that without reproducing the issue locally, we can only speculate about the cause of this exception. I will need to somehow isolate this exception to understand why it is happening in the first place. From the stack trace, I see that a group with the same key exists, which throws the exception. However, we will need to track why this is triggered. If you could modify the project attached in my previous reply, it would be of great help. Otherwise, we can only guess why this exception is raised.