Grouping Exception

[Adam Marshall]

Whenever I attempt to remove a group from the grid grouping area, either by dragging or clicking the 'close' button, an exception occurs.

I am using Q3 SP2 and VS2010 project (.NET4)
I have tried the same code in a .NET 3.5 project and the exception does not occur.

InvalidCastException:
Unable to cast object of type 'MS.Internal.NamedObject' to type 'Telerik.Windows.Data.GroupDescriptor'.

   at Telerik.Windows.Data.GroupDescriptor.Equals(Object obj) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Core\Data\Data\Grouping\GroupDescriptor.cs:line 191
   at System.Object.Equals(Object objA, Object objB)
   at System.Windows.Data.BindingExpression.OnDataContextChanged(DependencyObject contextElement)
   at System.Windows.Data.BindingExpression.HandlePropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)
   at System.Windows.Data.BindingExpressionBase.OnPropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)
   at System.Windows.Data.BindingExpression.OnPropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)
   at System.Windows.DependentList.InvalidateDependents(DependencyObject source, DependencyPropertyChangedEventArgs sourceArgs)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.TreeWalkHelper.OnInheritablePropertyChanged(DependencyObject d, InheritablePropertyChangeInfo info)
   at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d)
   at System.Windows.DescendentsWalker`1.VisitNode(FrameworkElement fe)
   at System.Windows.DescendentsWalker`1.VisitNode(DependencyObject d)
   at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)
   at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)
   at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)
   at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d)
   at System.Windows.DescendentsWalker`1.VisitNode(FrameworkElement fe)
   at System.Windows.DescendentsWalker`1.VisitNode(DependencyObject d)
   at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)
   at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)
   at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)
   at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d)
   at System.Windows.DescendentsWalker`1.VisitNode(FrameworkElement fe)
   at System.Windows.DescendentsWalker`1.VisitNode(DependencyObject d)
   at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)
   at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)
   at System.Windows.DescendentsWalker`1.StartWalk(DependencyObject startNode, Boolean skipStartNode)
   at System.Windows.TreeWalkHelper.InvalidateOnInheritablePropertyChange(FrameworkElement fe, FrameworkContentElement fce, InheritablePropertyChangeInfo info, Boolean skipStartNode)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at System.Windows.Controls.ItemContainerGenerator.UnlinkContainerFromItem(DependencyObject container, Object item)
   at System.Windows.Controls.ItemContainerGenerator.OnItemRemoved(Object item, Int32 itemIndex)
   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 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 Telerik.Windows.Data.RadObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Core\Data\Collections\RadObservableCollection.cs:line 141
   at System.Collections.ObjectModel.ObservableCollection`1.RemoveItem(Int32 index)
   at Telerik.Windows.Data.RadObservableCollection`1.RemoveItem(Int32 index) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Core\Data\Collections\RadObservableCollection.cs:line 212
   at Telerik.Windows.Data.ObservableItemCollection`1.RemoveItem(Int32 index) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Core\Data\Collections\ObservableItemCollection.cs:line 68
   at System.Collections.ObjectModel.Collection`1.Remove(T item)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.Ungroup(String member) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\GridViewDataControl.cs:line 3302
   at Telerik.Windows.Controls.GridView.GridViewDataControl.<>c__DisplayClass2a.<GroupingRequested>b__29() in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\GridViewDataControl.cs:line 3196
   at Telerik.Windows.Controls.CursorManager.PerformTimeConsumingOperation(FrameworkElement frameworkElement, Action action) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\CursorManager.cs:line 16
   at Telerik.Windows.Controls.GridView.GridViewDataControl.GroupingRequested(Object origin, GroupingRequestedEventArgs e) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\GridViewDataControl.cs:line 3177


XAML

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="WpfApplication1.MainWindow"
    x:Name="Window"
    Title="MainWindow"
    Width="640" Height="480"
    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"   >

    <Grid x:Name="LayoutRoot">
        <telerik:RadGridView x:Name="grid">  </telerik:RadGridView>
    </Grid>
</Window>

I used the code behind file for simplicity of testing:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public List<DOStaff> col = new List<DOStaff>();

        public MainWindow()
        {

            this.InitializeComponent();

            // Insert code required on object creation below this point.

            DOStaff tempStaff = new DOStaff();
            tempStaff.FirstName = "staf12399";

            col.Add(tempStaff);

            DOStaff tempStaff1 = new DOStaff();
            tempStaff1.FirstName = "staf12399";

            col.Add(tempStaff1);

            grid.ItemsSource=col;

        }
    }

    public class DOStaff
    {
        public virtual string FirstName { get; set;}

    }

}

[Michael Fooks]

It's a known .net 4.0 related bug..see: http://www.telerik.com/community/forums/wpf/gridview/issue-with-grouppanel.aspx

[Pavel Pavlov]

Hello Bronwen Zande,

Currently we are working to resolve this problem. It is .NET 4 specific . the Public Issue Tracking ID of the bug is 729.
Please excuse us for the inconvenience caused.

All the best,
Pavel Pavlov
the Telerik team

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