InvalidOperationException: Children collection already observed.
StackTrace:
   在 BetterClip.Data.DataServiceBase`2.Save(IEnumerable`1 items)
   在 IntelliTools.Domain.Favorite.FavorItemExtension.MoveTo(IEnumerable`1 items, FavorItem parentItem, Int32 index)
   在 GongSolutions.Wpf.DragDrop.DragDrop.DropTargetOnDrop(Object sender, DragEventArgs e, EventType eventType)
   在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   在 System.Windows.OleDropTarget.RaiseDragEvent(RoutedEvent dragEvent, Int32 dragDropKeyStates, Int32& effects, DependencyObject target, Point targetPoint)
   在 System.Windows.OleDropTarget.MS.Win32.UnsafeNativeMethods.IOleDropTarget.OleDrop(Object data, Int32 dragDropKeyStates, Int64 point, Int32& effects)
   在 MS.Win32.UnsafeNativeMethods.DoDragDrop(IDataObject dataObject, IOleDropSource dropSource, Int32 allowedEffects, Int32[] finalEffect)
   在 System.Windows.OleServicesContext.OleDoDragDrop(IDataObject dataObject, IOleDropSource dropSource, Int32 allowedEffects, Int32[] finalEffect)
   在 System.Windows.DragDrop.OleDoDragDrop(DependencyObject dragSource, DataObject dataObject, DragDropEffects allowedEffects)
   在 System.Windows.DragDrop.DoDragDrop(DependencyObject dragSource, Object data, DragDropEffects allowedEffects)
   在 GongSolutions.Wpf.DragDrop.DragDrop.DoDragSourceMove(Object sender, Func`2 getPosition)
   在 GongSolutions.Wpf.DragDrop.DragDrop.DragSourceOnMouseMove(Object sender, MouseEventArgs e)
   在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   在 System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   在 System.Windows.Input.InputManager.ProcessStagingArea()
   在 System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   在 System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   在 System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   在 System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   在 System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   在 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   在 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   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)

InvalidOperationException: Children collection already observed.
StackTrace:
   在 PropertyTools.Wpf.TreeListBox.InsertItem(Int32 index, Object item, Object parent)
   在 PropertyTools.Wpf.TreeListBox.InsertItems(Object parent, IList newItems, Int32 newStartingIndex)
   在 PropertyTools.Wpf.TreeListBox.Expand(Object item)
   在 PropertyTools.Wpf.TreeListBox.OnKeyDown(KeyEventArgs e)
   在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   在 System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   在 System.Windows.Input.InputManager.ProcessStagingArea()
   在 System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   在 System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   在 System.Windows.Interop.HwndKeyboardInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawKeyboardActions actions, Int32 scanCode, Boolean isExtendedKey, Boolean isSystemKey, Int32 virtualKey)
   在 System.Windows.Interop.HwndKeyboardInputProvider.ProcessKeyAction(MSG& msg, Boolean& handled)
   在 System.Windows.Interop.HwndSource.CriticalTranslateAccelerator(MSG& msg, ModifierKeys modifiers)
   在 System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param)
   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)

InvalidOperationException: Children collection already observed.
StackTrace:
   在 IntelliTools.Domain.Service.FavorDataService.Save(IEnumerable`1 item)
   在 IntelliTools.Domain.Favorite.FavorItemExtension.MoveTo(IEnumerable`1 items, FavorItem parentItem, Int32 index)
   在 GongSolutions.Wpf.DragDrop.DragDrop.DropTargetOnDrop(Object sender, DragEventArgs e, EventType eventType)
   在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   在 System.Windows.OleDropTarget.RaiseDragEvent(RoutedEvent dragEvent, Int32 dragDropKeyStates, Int32& effects, DependencyObject target, Point targetPoint)
   在 System.Windows.OleDropTarget.MS.Win32.UnsafeNativeMethods.IOleDropTarget.OleDrop(Object data, Int32 dragDropKeyStates, Int64 point, Int32& effects)
   在 MS.Win32.UnsafeNativeMethods.DoDragDrop(IDataObject dataObject, IOleDropSource dropSource, Int32 allowedEffects, Int32[] finalEffect)
   在 System.Windows.OleServicesContext.OleDoDragDrop(IDataObject dataObject, IOleDropSource dropSource, Int32 allowedEffects, Int32[] finalEffect)
   在 System.Windows.DragDrop.OleDoDragDrop(DependencyObject dragSource, DataObject dataObject, DragDropEffects allowedEffects)
   在 System.Windows.DragDrop.DoDragDrop(DependencyObject dragSource, Object data, DragDropEffects allowedEffects)
   在 GongSolutions.Wpf.DragDrop.DragDrop.DoDragSourceMove(Object sender, Func`2 getPosition)
   在 GongSolutions.Wpf.DragDrop.DragDrop.DragSourceOnMouseMove(Object sender, MouseEventArgs e)
   在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   在 System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   在 System.Windows.Input.InputManager.ProcessStagingArea()
   在 System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   在 System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   在 System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   在 System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   在 System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   在 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   在 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   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)

InvalidOperationException: Children collection already observed.
StackTrace:
   在 PropertyTools.Wpf.TreeListBox.InsertItem(Int32 index, Object item, Object parent)
   在 PropertyTools.Wpf.TreeListBox.InsertItems(Object parent, IList newItems, Int32 newStartingIndex)
   在 PropertyTools.Wpf.TreeListBox.ChildCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   在 System.Collections.ObjectModel.ReadOnlyObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
   在 System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   在 DynamicData.Binding.SortAndBind`2.SortApplicator.Reset(IEnumerable`1 sorted, Boolean fireReset)
   在 DynamicData.Binding.SortAndBind`2.<>c__DisplayClass2_0.<.ctor>b__0(IChangeSet`2 changes, Int32 index)
   在 System.Reactive.Linq.ObservableImpl.Select`2.SelectorIndexed._.OnNext(TSource value)
--- 引发异常的上一位置中堆栈跟踪的末尾 ---
   在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   在 System.Reactive.Stubs.<>c.<.cctor>b__2_1(Exception ex)
   在 System.Reactive.AnonymousSafeObserver`1.OnError(Exception error)
   在 System.Reactive.Sink`1.ForwardOnError(Exception error)
   在 System.Reactive.Linq.ObservableImpl.Select`2.SelectorIndexed._.OnNext(TSource value)
   在 System.Reactive.Linq.ObservableImpl.Select`2.Selector._.OnNext(TSource value)
   在 System.Reactive.Linq.ObservableImpl.Where`1.Predicate._.OnNext(TSource value)
   在 System.Reactive.Linq.ObservableImpl.Scan`2._.OnNext(TSource value)
   在 System.Reactive.AutoDetachObserver`1.OnNextCore(T value)
   在 System.Reactive.ObserverBase`1.OnNext(T value)
   在 System.Reactive.Linq.ObservableImpl.Where`1.Predicate._.OnNext(TSource value)
   在 System.Reactive.Linq.ObservableImpl.Merge`1.Observables._.InnerObserver.OnNext(TSource value)
   在 System.Reactive.Linq.ObservableImpl.Select`2.Selector._.OnNext(TSource value)
   在 System.Reactive.Concurrency.Synchronize`1._.OnNext(TSource value)
   在 System.Reactive.AutoDetachObserver`1.OnNextCore(T value)
   在 System.Reactive.ObserverBase`1.OnNext(T value)
   在 System.Reactive.AnonymousSafeObserver`1.OnNext(T value)
   在 System.Reactive.Linq.ObservableImpl.CombineLatest`3._.FirstObserver.OnNext(TFirst value)
   在 System.Reactive.Linq.ObservableImpl.Select`2.Selector._.OnNext(TSource value)
   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)