I have updated to the latest version of the grid. It no longer allows me to set the grid's selecteditem property to null. It formerly allowed this, now it throws the following exception. I am not sure what to do to work around this, any help would be appreciated.

I am databinding a dependency property that gets set to null, this dependency is databound to the grid's selected item. The stack trace below reflects that operation, the event being raised, going through databinding and throwing inside the Xceed grid.

 -Chris-

Error when upgrading to 3.1 from 3.0 - setting grid's selecteditem to null throws exception.

  ArgumentNullException [mscorlib] : Value cannot be null.
Parameter name: key
                               at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
   at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
   at Xceed.Wpf.DataGrid.SelectionChanger.SelectJustThisItem(Object item, Boolean assumeInItemsCollection)
   at Xceed.Wpf.DataGrid.SelectionManager.SelectJustThisItem(DataGridContext dataGridContext, Object item, Boolean assumeInItemsCollection)
   at Xceed.Wpf.DataGrid.DataGridControl.OnSelectedItemChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   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, OperationType operationType)
   at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp)
   at System.Windows.Data.BindingExpression.Invalidate(Boolean isASubPropertyChange)
   at System.Windows.Data.BindingExpression.TransferValue(Object newValue, Boolean isASubPropertyChange)
   at System.Windows.Data.BindingExpression.ScheduleTransfer(Boolean isASubPropertyChange)
   at MS.Internal.Data.ClrBindingWorker.NewValueAvailable(Boolean dependencySourcesChanged, Boolean initialValue, Boolean isASubPropertyChange)
   at MS.Internal.Data.PropertyPathWorker.UpdateSourceValueState(Int32 k, ICollectionView collectionView, Object newValue, Boolean isASubPropertyChange)
   at MS.Internal.Data.ClrBindingWorker.OnSourcePropertyChanged(Object o, String propName)
   at MS.Internal.Data.PropertyPathWorker.System.Windows.IWeakEventListener.ReceiveWeakEvent(Type managerType, Object sender, EventArgs e)
   at System.Windows.WeakEventManager.DeliverEventToList(Object sender, EventArgs args, ListenerList list)
   at System.ComponentModel.PropertyChangedEventManager.OnPropertyChanged(Object sender, PropertyChangedEventArgs args)
   at Polygon.Utilities.Patterns.SynchronizedPropertyChangedEventHandler.Raise(Object sender, Func`1 createArgs) in c:\tfs\EDS\main\src1\Shared\Utilities\Patterns\SynchronizedEventHandler.cs:line 501
   at Polygon.Utilities.Patterns.SynchronizedPropertyChangedEventHandler.Raise(Object sender, String propertyName) in c:\tfs\EDS\main\src1\Shared\Utilities\Patterns\SynchronizedEventHandler.cs:line 507
   at Polygon.Client.Core.Controls.ChooserViewModel.OnPropertyChanged(String name) in c:\tfs\EDS\main\src1\Shared\ClientCore\Controls\ChooserViewModel.cs:line 403
   at Polygon.Client.Core.Controls.ChooserViewModel.set_GridSelectedItem(Object value) in c:\tfs\EDS\main\src1\Shared\ClientCore\Controls\ChooserViewModel.cs:line 376
   at Polygon.Client.Core.Controls.ChooserControl.<TryCreateViewModel>b__7(Object , EventArgs ) in c:\tfs\EDS\main\src1\Shared\ClientCore\Controls\ChooserControl.xaml.cs:line 427
   at System.EventHandler.Invoke(Object sender, EventArgs e)
   at System.Windows.FrameworkElement.RaiseClrEvent(EventPrivateKey key, EventArgs args)
   at System.Windows.Controls.Primitives.Popup.OnClosed(EventArgs e)
   at System.Windows.Controls.Primitives.Popup.DestroyWindow()
   at System.Windows.Controls.Primitives.Popup.<HideWindow>b__1(Object sender, EventArgs args)
   at System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
 

That is unfortunate. We have been waiting for this release (for column chooser, excel export, saving settings, etc.) for some time, and now we will still have to wait - unless there is a workaround you are aware of?? We are in the position that we MUST now write a column chooser, export settings etc because we cannot upgrade to the latest version of the grid. We have tried to coordinate with your published schedule, but so far - it has not served us well.

Is there any timeframe for the service release? Is there any way to get a patch? Our license are all under Polygon Investment Partners...

-Disappointed-

Chris

This is to let you know that this issue is now fixed in version 3.1.9117.10090, which you can download here :

http://xceed.com/Grid_WPF_Intro.html