propertygrid binding string[] error

[lsl]

#44860 |

I have a class like

class A
{
   public string[] xx{get...;set...;}
}
PropertyGrid.DataContext = new A();

when I edit xx on propertygrid will get error

System.Windows.Data Error: 8 : Cannot save value from target back to source. BindingExpression:Path=Text; DataItem='PropertyGridEditorPrimitiveTypeCollectionControl' (Name=''); target element is 'MultiLineTextEditor' (Name=''); target property is 'Text' (type 'String') NullReferenceException:'System.NullReferenceException: 未将对象引用设置到对象的实例。
   在 Xceed.Wpf.Toolkit.PrimitiveTypeCollectionControl.CreateItemsSource()
   在 Xceed.Wpf.Toolkit.PrimitiveTypeCollectionControl.ComputeItemsSource()
   在 Xceed.Wpf.Toolkit.PrimitiveTypeCollectionControl.PersistChanges()
   在 Xceed.Wpf.Toolkit.PrimitiveTypeCollectionControl.OnTextChanged(String oldValue, String newValue)
   在 Xceed.Wpf.Toolkit.PrimitiveTypeCollectionControl.OnTextChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
   在 System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   在 System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   在 System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   在 System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   在 System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
   在 MS.Internal.Data.PropertyPathWorker.SetValue(Object item, Object value)
   在 MS.Internal.Data.ClrBindingWorker.UpdateValue(Object value)
   在 System.Windows.Data.BindingExpression.UpdateSource(Object value)'

I used latest version

  <package id="Xceed.Products.Wpf.Toolkit.Base" version="3.4.17280.14430" targetFramework="net461" />
  <package id="Xceed.Wpf.Toolkit" version="3.4.17280.14430" targetFramework="net461" />

is this a bug or something I got mistake? thank you

[lsl]

#44861

[Editor(typeof(CollectionEditor), typeof(CollectionEditor))]
I try add on xx ,but I can not add string into it because add button is unenable

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