ArgumentNullException: 值不能为 null。 参数名: item StackTrace: 在 PropertyTools.Wpf.TreeListBox.InsertItem(Int32 index, Object item, Object parent) 在 PropertyTools.Wpf.TreeListBox.HierarchySourceChanged(DependencyPropertyChangedEventArgs e) 在 PropertyTools.Wpf.TreeListBox.<>c.<.cctor>b__11_1(DependencyObject s, 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.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue) 在 System.Windows.Data.BindingExpressionBase.Invalidate(Boolean isASubPropertyChange) 在 System.Windows.Data.BindingExpression.TransferValue(Object newValue, Boolean isASubPropertyChange) 在 MS.Internal.Data.PropertyPathWorker.UpdateSourceValueState(Int32 k, ICollectionView collectionView, Object newValue, Boolean isASubPropertyChange) 在 MS.Internal.Data.ClrBindingWorker.OnSourcePropertyChanged(Object o, String propName) 在 System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType) 在 System.ComponentModel.PropertyChangedEventManager.OnPropertyChanged(Object sender, PropertyChangedEventArgs args) 在 System.ComponentModel.PropertyChangedEventHandler.Invoke(Object sender, PropertyChangedEventArgs e) 在 IntelliTools.View.Favorite.FavorItemListViewModel.set_CurrentModel(FavorItem value) 在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) 在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) 在 System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg) 在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) 在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)