Hi,

I'm creating a modular application where modules can add items to a ribbon control.  I've created a region on a RibbonTabItem and I have modules which register RibbonGroup views to it.  However an ArgumentOutOfRangeException sometomes occurs (but not always) when a second item is being added to the region.  The exception is thrown in the region.ActiveViews.CollectionChanged event implementation when new items are being added and it gets to _RegionTarget.RibbonGroups.Add(view). Code and stack trace below.  Any help you be appreciated.

RegionAdapter Code:

=========================================

public class RibbonTabRegionBehaviour : RegionAdapterBase<RibbonTabItem>
    {
        private RibbonTabItem _RegionTarget = null;
        public RibbonTabRegionBehaviour(IRegionBehaviorFactory regionBehaviorFactory)
            : base(regionBehaviorFactory)
        {
        }
        protected override void Adapt(IRegion region, RibbonTabItem regionTarget)
        {
            _RegionTarget = regionTarget;
            if (_RegionTarget.RibbonGroups.Any<RibbonGroup>())
            {
                foreach (RibbonGroup ribbonGroup in _RegionTarget.RibbonGroups)
                {
                    region.Add(ribbonGroup);
                }
                _RegionTarget.RibbonGroups.Clear();
            }
            foreach (object view in region.Views)
            {
                AddView(view);
            }
            region.ActiveViews.CollectionChanged += new NotifyCollectionChangedEventHandler(ActiveViews_CollectionChanged);
        } 
        private void ActiveViews_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            switch (e.Action)
            {
                case NotifyCollectionChangedAction.Add:
 
                    foreach (object view in e.NewItems)
                    {
                        AddView(view);                      
                    }
                    break;
                case NotifyCollectionChangedAction.Remove:
                    foreach (object current in e.OldItems)
                    {
                        if (!(current is RibbonGroup))
                        {
                            throw new NotSupportedException(string.Format("View of type '{0}' is not supported.", current.GetType().Name));
                        }
                        _RegionTarget.RibbonGroups.Remove(current as RibbonGroup);
                    }
                    break;
            }
        }
        protected override IRegion CreateRegion()
        {
            return new AllActiveRegion();
        } 
        private void AddView(object view)
        {
            RibbonGroup rti = view as RibbonGroup;
            if (rti != null)
            {
                if(!_RegionTarget.RibbonGroups.Contains(view))
                    _RegionTarget.RibbonGroups.Add(rti);
            }  
        }
    }

==================================

Exception details:

<event errorType="ModuleInitializeException">
<message>An exception occurred while initializing module 'WebUIWebLink'.
- The exception message was: An exception has occurred while trying to add a view to region 'HomeTabRegion'.
- The most likely causing exception was was: 'System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: index
at System.Windows.Media.VisualCollection.Insert(Int32 index, Visual visual)
at System.Windows.Controls.Panel.AddChildren(GeneratorPosition pos, Int32 itemCount)
at System.Windows.Controls.Panel.OnItemsChangedInternal(Object sender, ItemsChangedEventArgs args)
at System.Windows.Controls.Panel.OnItemsChanged(Object sender, ItemsChangedEventArgs args)
at System.Windows.Controls.ItemContainerGenerator.OnItemAdded(Object item, Int32 index)
at System.Windows.Controls.ItemContainerGenerator.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)
at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)
at System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Controls.ItemCollection.OnViewCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)
at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)
at System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Data.ListCollectionView.ProcessCollectionChangedWithAdjustedIndex(NotifyCollectionChangedEventArgs args, Int32 adjustedOldIndex, Int32 adjustedNewIndex)
at System.Windows.Data.ListCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Infragistics.Collections.ObservableCollectionExtended`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Infragistics.Collections.ObservableCollectionExtended`1.InsertItem(Int32 index, T item)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at AgeasUK.AgentToolbar.Application.Core.Modularity.Infragistics.RibbonTabRegionBehaviour.ActiveViews_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at Microsoft.Practices.Prism.Regions.ViewsCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Microsoft.Practices.Prism.Regions.ViewsCollection.NotifyAdd(IList items, Int32 newStartingIndex)
at Microsoft.Practices.Prism.Regions.ViewsCollection.NotifyAdd(Object item)
at Microsoft.Practices.Prism.Regions.ViewsCollection.SourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at Microsoft.Practices.Prism.Regions.Region.InnerAdd(Object view, String viewName, IRegionManager scopedRegionManager)
at Microsoft.Practices.Prism.Regions.Region.Add(Object view, String viewName, Boolean createRegionManagerScope)
at Microsoft.Practices.Prism.Regions.Region.Add(Object view)
at Microsoft.Practices.Prism.Regions.Behaviors.AutoPopulateRegionBehavior.AddViewIntoRegion(Object viewToAdd)
at Microsoft.Practices.Prism.Regions.Behaviors.AutoPopulateRegionBehavior.OnViewRegistered(Object sender, ViewRegisteredEventArgs e)'.
But also check the InnerExceptions for more detail.
</message>
<data />
<stackTrace> at Microsoft.Practices.Prism.Modularity.ModuleInitializer.HandleModuleInitializationError(ModuleInfo moduleInfo, String assemblyName, Exception exception)
at Microsoft.Practices.Prism.Modularity.ModuleInitializer.Initialize(ModuleInfo moduleInfo)
at Microsoft.Practices.Prism.Modularity.ModuleManager.LoadModulesThatAreReadyForLoad()
at Microsoft.Practices.Prism.Modularity.ModuleManager.LoadModuleTypes(IEnumerable`1 moduleInfos)
at Microsoft.Practices.Prism.Modularity.ModuleManager.LoadModule(String moduleName)
at AgeasUK.AgentToolbar.Modules.Startup.UI.ViewModels.StartupViewModel.&lt;&gt;c__DisplayClass9.&lt;LoadWorker_DoWork&gt;b__4()</stackTrace>
<source>Microsoft.Practices.Prism.Composition</source>
<event errorType="ViewRegistrationException">
<message>An exception has occurred while trying to add a view to region 'HomeTabRegion'.
- The most likely causing exception was was: 'System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: index
at System.Windows.Media.VisualCollection.Insert(Int32 index, Visual visual)
at System.Windows.Controls.Panel.AddChildren(GeneratorPosition pos, Int32 itemCount)
at System.Windows.Controls.Panel.OnItemsChangedInternal(Object sender, ItemsChangedEventArgs args)
at System.Windows.Controls.Panel.OnItemsChanged(Object sender, ItemsChangedEventArgs args)
at System.Windows.Controls.ItemContainerGenerator.OnItemAdded(Object item, Int32 index)
at System.Windows.Controls.ItemContainerGenerator.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)
at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)
at System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Controls.ItemCollection.OnViewCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)
at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)
at System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Data.ListCollectionView.ProcessCollectionChangedWithAdjustedIndex(NotifyCollectionChangedEventArgs args, Int32 adjustedOldIndex, Int32 adjustedNewIndex)
at System.Windows.Data.ListCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Infragistics.Collections.ObservableCollectionExtended`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Infragistics.Collections.ObservableCollectionExtended`1.InsertItem(Int32 index, T item)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at AgeasUK.AgentToolbar.Application.Core.Modularity.Infragistics.RibbonTabRegionBehaviour.ActiveViews_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at Microsoft.Practices.Prism.Regions.ViewsCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Microsoft.Practices.Prism.Regions.ViewsCollection.NotifyAdd(IList items, Int32 newStartingIndex)
at Microsoft.Practices.Prism.Regions.ViewsCollection.NotifyAdd(Object item)
at Microsoft.Practices.Prism.Regions.ViewsCollection.SourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at Microsoft.Practices.Prism.Regions.Region.InnerAdd(Object view, String viewName, IRegionManager scopedRegionManager)
at Microsoft.Practices.Prism.Regions.Region.Add(Object view, String viewName, Boolean createRegionManagerScope)
at Microsoft.Practices.Prism.Regions.Region.Add(Object view)
at Microsoft.Practices.Prism.Regions.Behaviors.AutoPopulateRegionBehavior.AddViewIntoRegion(Object viewToAdd)
at Microsoft.Practices.Prism.Regions.Behaviors.AutoPopulateRegionBehavior.OnViewRegistered(Object sender, ViewRegisteredEventArgs e)'.
But also check the InnerExceptions for more detail or call .GetRootException(). </message>
<data />
<stackTrace> at Microsoft.Practices.Prism.Regions.RegionViewRegistry.OnContentRegistered(ViewRegisteredEventArgs e)
at Microsoft.Practices.Prism.Regions.RegionViewRegistry.RegisterViewWithRegion(String regionName, Func`1 getContentDelegate)
at Microsoft.Practices.Prism.Regions.RegionViewRegistry.RegisterViewWithRegion(String regionName, Type viewType)
at Microsoft.Practices.Prism.Regions.RegionManagerExtensions.RegisterViewWithRegion(IRegionManager regionManager, String regionName, Type viewType)
at AgeasUK.AgentToolbar.Modules.Web.UI.WebLink.ModuleDefinition.Initialize()
at Microsoft.Practices.Prism.Modularity.ModuleInitializer.Initialize(ModuleInfo moduleInfo)</stackTrace>
<source>Microsoft.Practices.Prism.Composition</source>
<event errorType="ArgumentOutOfRangeException">
<message>Specified argument was out of the range of valid values.
Parameter name: index</message>
<data />
<stackTrace> at System.Windows.Media.VisualCollection.Insert(Int32 index, Visual visual)
at System.Windows.Controls.Panel.AddChildren(GeneratorPosition pos, Int32 itemCount)
at System.Windows.Controls.Panel.OnItemsChangedInternal(Object sender, ItemsChangedEventArgs args)
at System.Windows.Controls.Panel.OnItemsChanged(Object sender, ItemsChangedEventArgs args)
at System.Windows.Controls.ItemContainerGenerator.OnItemAdded(Object item, Int32 index)
at System.Windows.Controls.ItemContainerGenerator.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)
at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)
at System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Controls.ItemCollection.OnViewCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)
at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)
at System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Data.ListCollectionView.ProcessCollectionChangedWithAdjustedIndex(NotifyCollectionChangedEventArgs args, Int32 adjustedOldIndex, Int32 adjustedNewIndex)
at System.Windows.Data.ListCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Infragistics.Collections.ObservableCollectionExtended`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Infragistics.Collections.ObservableCollectionExtended`1.InsertItem(Int32 index, T item)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at AgeasUK.AgentToolbar.Application.Core.Modularity.Infragistics.RibbonTabRegionBehaviour.ActiveViews_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at Microsoft.Practices.Prism.Regions.ViewsCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at Microsoft.Practices.Prism.Regions.ViewsCollection.NotifyAdd(IList items, Int32 newStartingIndex)
at Microsoft.Practices.Prism.Regions.ViewsCollection.NotifyAdd(Object item)
at Microsoft.Practices.Prism.Regions.ViewsCollection.SourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at Microsoft.Practices.Prism.Regions.Region.InnerAdd(Object view, String viewName, IRegionManager scopedRegionManager)
at Microsoft.Practices.Prism.Regions.Region.Add(Object view, String viewName, Boolean createRegionManagerScope)
at Microsoft.Practices.Prism.Regions.Region.Add(Object view)
at Microsoft.Practices.Prism.Regions.Behaviors.AutoPopulateRegionBehavior.AddViewIntoRegion(Object viewToAdd)
at Microsoft.Practices.Prism.Regions.Behaviors.AutoPopulateRegionBehavior.OnViewRegistered(Object sender, ViewRegisteredEventArgs e)</stackTrace>
<source>PresentationCore</source>
</event>
</event>
</event>

=============

Thanks In Advance,

Andy G