Q1 2013: problem with ColumnSortDescriptor

[Patrick]

Hello,
I have a problem with the Q1 2013 version that was not in the previous, Q3 2012 SP1, version.
In my application, I have a list of rankings in a TabItem (Microsoft, not Telerik). When I double-click on a ranking, the details of the ranking are displayed in a new TabItem. Now, if I close the tab item with the ranking details, I have the following error:

Error message= Error: Unhandled Error in Silverlight Application
Code: 4004    
Category: ManagedRuntimeError       
Message: System.ArgumentNullException: Column cannot be null
Parameter name: newColumn
   at Telerik.Windows.Controls.GridView.ColumnSortDescriptor.OnColumnChanged(GridViewColumn oldColumn, GridViewColumn newColumn)
   at Telerik.Windows.Controls.GridView.ColumnSortDescriptor.OnColumnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
   at Telerik.Windows.PropertyMetadata.PropertyChangeHook.OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
   at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
   at System.Windows.DependencyObject.RefreshExpression(DependencyProperty dp)
   at System.Windows.Data.BindingExpression.SendDataToTarget()
   at System.Windows.Data.BindingExpression.SourcePropertyChanged(PropertyPathListener sender, PropertyPathChangedEventArgs args)
   at System.Windows.PropertyPathListener.ReconnectPath()
   at System.Windows.PropertyPathListener.RaisePropertyPathStepChanged(PropertyPathStep source)
   at System.Windows.IndexerPathStep.RaisePropertyPathStepChanged(PropertyListener source)
   at System.Windows.IndexerListener.SourcePropertyChanged(Object sender, PropertyChangedEventArgs args)
   at System.Windows.Data.WeakPropertyChangedListener.PropertyChangedCallback(Object sender, PropertyChangedEventArgs args)
   at System.Collections.ObjectModel.ObservableCollection`1.OnPropertyChanged(PropertyChangedEventArgs e)
   at System.Collections.ObjectModel.ObservableCollection`1.ClearItems()
   at Telerik.Windows.Controls.GridViewColumnCollectionInternal.ClearItems()
   at System.Collections.ObjectModel.Collection`1.Clear()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.TotalColumnRefresh()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)


I've look at what can cause this error and found that the following XAML code, in the list of rankings, is the cause of the error:

<tk:GridView.SortDescriptors>
  <tk:ColumnSortDescriptor Column="{Binding Columns[LastChangeDT], ElementName=GridView}" SortDirection="Descending" />
</tk:GridView.SortDescriptors>

If I comment out this code or replace it with a normal SortDescriptor, the error is gone.

I've also found other problems with ColumnSortDescriptor, where the column is not found (even if it exists) and the application crash.
Perhaps a check for null for the column in your code would avoid many crashes.

Patrick

[Vera]

Hello Patrick,

 
This issue has already been resolved and the fix is available with our Latest Internal Build. Please download it and give it a try.

Let us know in case you experience any other problems.

Greetings,
Vera
the Telerik team

[Patrick]

Vera,
after installing the .225 version, I have the following error, using the same scenario:

Error message= Error: Unhandled Error in Silverlight Application
Code: 4004    
Category: ManagedRuntimeError       
Message: System.ArgumentException: At least one object must implement IComparable.
   at System.Collections.Comparer.Compare(Object a, Object b)
   at System.Collections.Generic.ObjectComparer`1.Compare(T x, T y)
   at System.Linq.EnumerableSorter`2.CompareKeys(Int32 index1, Int32 index2)
   at System.Linq.EnumerableSorter`1.QuickSort(Int32[] map, Int32 left, Int32 right)
   at System.Linq.EnumerableSorter`1.Sort(TElement[] elements, Int32 count)
   at System.Linq.OrderedEnumerable`1.<GetEnumerator>d__0.MoveNext()
   at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source)
   at lambda_method(Closure )
   at System.Linq.EnumerableExecutor`1.Execute()
   at System.Linq.EnumerableExecutor`1.ExecuteBoxed()
   at System.Linq.EnumerableQuery`1.System.Linq.IQueryProvider.Execute(Expression expression)
   at Telerik.Windows.Data.QueryableExtensions.Count(IQueryable source)
   at Telerik.Windows.Data.QueryableExtensions.Aggregate(IQueryable source, IEnumerable`1 aggregateFunctions)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.CreateAggregateResults()
   at Telerik.Windows.Controls.GridViewColumnCollectionInternal.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
   at Telerik.Windows.Controls.GridViewColumnCollectionInternal.InsertItem(Int32 index, GridViewColumn item)
   at System.Collections.ObjectModel.Collection`1.Add(T item)
   at Telerik.Windows.Data.CollectionExtensions.AddRange[T](ICollection`1 collection, IEnumerable`1 items)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.TotalColumnRefresh()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)

That's not really an amelioration.

Patrick

[Vera]

Hello Patrick,

 
Unfortunately, we were not able to reproduce the exception using the provided details. Will it be possible for you to isolate the problem in a sample project so we can debug it on our side? You can send the project by opening a support ticket.

Thank you in advance.

All the best,
Vera
the Telerik team