Sorting Problem

[boris]

Hello,

I have some problems when trying to use built in sorting. I tried to look for answer in the documentation, but could not find the answer I need.

I am having trouble understanding what should implement the IComparable in order for sorting to work. I have an object with primitive types inside, and the list of these objects is my items source for the grid. When I try to sort I get this exception:

Message: At least one object must implement IComparable.

Stack Trace:    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 Telerik.Windows.Data.QueryableCollectionView.CreateInternalList()

   at Telerik.Windows.Data.QueryableCollectionView.EnsureInternalList()

   at Telerik.Windows.Data.QueryableCollectionView.get_InternalList()

   at Telerik.Windows.Data.QueryableCollectionView.get_IsEmpty()

   at Telerik.Windows.Controls.GridView.BaseItemsControl.OnItemCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)

   at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)

   at Telerik.Windows.Data.DataItemCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

   at Telerik.Windows.Data.DataItemCollection.Telerik.Windows.Data.IWeakEventListener<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.ReceiveWeakEvent(Object sender, NotifyCollectionChangedEventArgs e)

   at Telerik.Windows.Data.WeakEvent.WeakListener`1.Handler(Object sender, TArgs args)

   at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)

   at Telerik.Windows.Data.QueryableCollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)

   at Telerik.Windows.Data.QueryableCollectionView.RefreshAndRaiseCollectionChanged(NotifyCollectionChangedEventArgs args)

   at Telerik.Windows.Data.QueryableCollectionView.Refresh()

   at Telerik.Windows.Data.QueryableCollectionView.EndDefer()

   at Telerik.Windows.Data.QueryableCollectionView.DeferHelper.Dispose()

   at Telerik.Windows.Data.DataItemCollection.OnSortDescriptorsCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)

   at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

   at Telerik.Windows.Data.RadObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

   at Telerik.Windows.Data.RadObservableCollection`1.ResumeNotifications()

   at Telerik.Windows.Controls.GridView.GridViewDataControl.PerformSorting(String propertyName, Boolean appendToExisting, SortingState newSortingState)

   at Telerik.Windows.Controls.GridView.GridViewDataControl.<>c__DisplayClass17.<Sort>b__16()

   at Telerik.Windows.Controls.CursorManager.PerformTimeConsumingOperation(FrameworkElement frameworkElement, Action action)

   at Telerik.Windows.Controls.GridView.GridViewDataControl.Sort(GridViewBoundColumnBase column, Boolean appendToExisting)

   at Telerik.Windows.Controls.GridView.GridViewHeaderCell.RequestSort(Boolean appendToExisting)

   at Telerik.Windows.Controls.GridView.GridViewHeaderCell.OnMouseLeftButtonUp(MouseButtonEventArgs e)

   at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)

   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)

[Vlad]

Hello boris,

 This problem again is related to missing DataMemberBindng - you can check my answer in your other thread.

All the best,
Vlad
the Telerik team

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[boris]

Tnx ;)