Filtering Exception

[Xinfeng]

We got the following exception sometime when filtering the GridView:

Failed to compare two elements in the array.
   at System.Collections.Generic.ArraySortHelper`1.BinarySearch(T[] array, Int32 index, Int32 length, T value, IComparer`1 comparer)
   at System.Array.BinarySearch[T](T[] array, Int32 index, Int32 length, T value, IComparer`1 comparer)
   at System.Collections.Generic.List`1.BinarySearch(Int32 index, Int32 count, T item, IComparer`1 comparer)
   at Telerik.Windows.Data.KeyedCollection.IndexOf(Object value)
   at Telerik.Windows.Data.QueryableCollectionView.InternalIndexOf(Object item)
   at Telerik.Windows.Data.QueryableCollectionView.IndexOf(Object item)
   at Telerik.Windows.Data.QueryableCollectionView.Contains(Object item)
   at Telerik.Windows.Data.DataItemCollection.Contains(Object value)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.CanActivateRowExecute(Object sender, CanExecuteRoutedEventArgs e)
   at Telerik.Windows.Controls.CommandBinding.OnCanExecute(Object sender, CanExecuteRoutedEventArgs e)
   at Telerik.Windows.Controls.CommandManager.FindCommandBinding(CommandBindingCollection commandBindings, Object sender, RoutedEventArgs e, ICommand command, Boolean execute)
   at Telerik.Windows.Controls.CommandManager.FindCommandBinding(Object sender, RoutedEventArgs e, ICommand command, Boolean execute)
   at Telerik.Windows.Controls.CommandManager.OnCanExecute(Object sender, CanExecuteRoutedEventArgs e)
   at Telerik.Windows.Controls.CanExecuteRoutedEventArgs.InvokeEventHandler(Delegate genericHandler, Object target)
   at Telerik.Windows.RadRoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at Telerik.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RadRoutedEventArgs routedEventArgs)
   at Telerik.Windows.EventRoute.InvokeHandlersImpl(Object source, RadRoutedEventArgs args, Boolean raisedAgain)
   at Telerik.Windows.RadRoutedEventHelper.RaiseEvent(DependencyObject element, RadRoutedEventArgs args)
   at Telerik.Windows.Controls.RoutedCommand.CanExecute(Object parameter, UIElement target)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.ExecutePendingCommand()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnKeyDown(KeyEventArgs e)
   at System.Windows.Controls.Control.OnKeyDown(Control ctrl, EventArgs e)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)---
Failed to compare two elements in the array.
   at Telerik.Windows.Data.FuncExtensions.<>c__DisplayClass1`2.<ToUntypedFunc>b__0(Object item)
   at Telerik.Windows.Data.FunctionComparer.Compare(Object x, Object y)
   at System.Collections.Generic.ArraySortHelper`1.InternalBinarySearch(T[] array, Int32 index, Int32 length, T value, IComparer`1 comparer)
   at System.Collections.Generic.ArraySortHelper`1.BinarySearch(T[] array, Int32 index, Int32 length, T value, IComparer`1 comparer)---

The code related to the filter is as following:

 private readonly PredicateFilterDescriptor _quickFilter;

 public void Filter()
 {
            if( Control.FilterDescriptors.Count == 0 )
                Control.FilterDescriptors.Add(_quickFilter);
 
            _quickFilter.FilterValue = QuickFilterValue;
 }        

public class PredicateFilterDescriptor : FilterDescriptorBase
 {
        private readonly Func<object,string,bool> _predicate;
 
        public string FilterValue { get; set; }
 
        public PredicateFilterDescriptor(Func<object,string,bool> predicate) { _predicate = predicate; }
 
        protected override System.Linq.Expressions.Expression CreateFilterExpression(ParameterExpression parameterExpression)
        {
            if (string.IsNullOrEmpty(FilterValue))
                return System.Linq.Expressions.Expression.Constant(true);
 
            return System.Linq.Expressions.Expression.Invoke(
                System.Linq.Expressions.Expression.Constant(_predicate), 
                parameterExpression,
                System.Linq.Expressions.Expression.Constant(FilterValue));
        }
  }

Thanks a lot!