RadDocking + MEF + Prism 4 + RegisterViewWithRegion = Element already has a logical parent

[Peter]

Hi,

I have been stuck with this issue for a few days now and I need to move on. I am attempting to convince our company to use Telerik + Prism 4 for a new project we are undertaking, however I cannot even show them how to add a document to a RadDock when they click a button in the Ribbon Bar.

All of my problems center around our friend, the RadPaneGroupRegionAdapter and the implementation provided by Telerik. It simply does not work. I can register the views (documents) successfully on startup of the application, however as soon as my command attempts to execute the following code:

m_RegionManager.RegisterViewWithRegion(WpfPrism.Infrastructure.Helpers.RegionNameHelper.Document, typeof(Views.Search)); 

All is lost and I get the following error:

System.InvalidOperationException was unhandled by user code
Message=Element already has a logical parent. It must be detached from the old parent before it is attached to a new one.
Source=PresentationFramework
StackTrace:
at MS.Internal.Controls.InnerItemCollectionView.AssertPristineModelChild(Object item)
at MS.Internal.Controls.InnerItemCollectionView.Add(Object item)
at System.Windows.Controls.ItemCollection.Add(Object newItem)
at Telerik.Windows.Controls.RadSplitContainer.PrepareContainerForItemOverride(DependencyObject element, Object item) in c:\TB\102\WPF_Scrum\Release_WPF_40\Sources\Development\Controls\Docking\Docking\Docking\RadSplitContainer.cs:line 689
at System.Windows.Controls.ItemsControl.MS.Internal.Controls.IGeneratorHost.PrepareItemContainer(DependencyObject container, Object item)
at System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.Primitives.IItemContainerGenerator.PrepareItemContainer(DependencyObject container)
at System.Windows.Controls.Panel.GenerateChildren()
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.OnRefresh()
at System.Windows.Controls.ItemContainerGenerator.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Windows.Controls.ItemContainerGenerator.System.Windows.IWeakEventListener.ReceiveWeakEvent(Type managerType, Object sender, EventArgs e)
at System.Windows.WeakEventManager.DeliverEventToList(Object sender, EventArgs args, ListenerList list)
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.System.Windows.IWeakEventListener.ReceiveWeakEvent(Type managerType, Object sender, EventArgs e)
at System.Windows.WeakEventManager.DeliverEventToList(Object sender, EventArgs args, ListenerList list)
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 MS.Internal.Data.EnumerableCollectionView.LoadSnapshot(IEnumerable source)
at MS.Internal.Data.EnumerableCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at Microsoft.Practices.Prism.Regions.ViewsCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e) in c:\release\WorkingDir\PrismLibraryBuild\PrismLibrary\Desktop\Prism\Regions\ViewsCollection.cs:line 124
at Microsoft.Practices.Prism.Regions.ViewsCollection.NotifyReset() in c:\release\WorkingDir\PrismLibraryBuild\PrismLibrary\Desktop\Prism\Regions\ViewsCollection.cs:line 129
at Microsoft.Practices.Prism.Regions.ViewsCollection.SourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e) in c:\release\WorkingDir\PrismLibraryBuild\PrismLibrary\Desktop\Prism\Regions\ViewsCollection.cs:line 255
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) in c:\release\WorkingDir\PrismLibraryBuild\PrismLibrary\Desktop\Prism\Regions\Region.cs:line 380
at Microsoft.Practices.Prism.Regions.Region.Add(Object view, String viewName, Boolean createRegionManagerScope) in c:\release\WorkingDir\PrismLibraryBuild\PrismLibrary\Desktop\Prism\Regions\Region.cs:line 275
at Microsoft.Practices.Prism.Regions.Region.Add(Object view) in c:\release\WorkingDir\PrismLibraryBuild\PrismLibrary\Desktop\Prism\Regions\Region.cs:line 246
at Microsoft.Practices.Prism.Regions.Behaviors.AutoPopulateRegionBehavior.AddViewIntoRegion(Object viewToAdd) in c:\release\WorkingDir\PrismLibraryBuild\PrismLibrary\Desktop\Prism\Regions\Behaviors\AutoPopulateRegionBehavior.cs:line 84
at Microsoft.Practices.Prism.Regions.Behaviors.AutoPopulateRegionBehavior.OnViewRegistered(Object sender, ViewRegisteredEventArgs e) in c:\release\WorkingDir\PrismLibraryBuild\PrismLibrary\Desktop\Prism\Regions\Behaviors\AutoPopulateRegionBehavior.cs:line 109
 
Here is a link to where the solution can be found WpfPrism

[George]

Hi Peter,

 
We took some time to investigate the problem. It seems that in the ShellView where the RadDocking control is defined, the RadSplitContainer is set as a region, but in the BootStrapper.ConfigureRegionAdapterMappings() method the mappings are registered for RadPaneGroup, not for the RadSplitContainer. If you set the pane group as region, no exception will be thrown:

<telerik:RadDocking.DocumentHost>
                <telerik:RadSplitContainer>
                    <telerik:RadPaneGroup prism:RegionManager.RegionName="DocumentRegion" />
                </telerik:RadSplitContainer>
            </telerik:RadDocking.DocumentHost>

I hope this helps.

All the best,
George
the Telerik team