InvalidOperationException: “[Unknown]”属性未指向路径“(0).(1)[1].(2)”中的 DependencyObject。
StackTrace:
   在 System.Windows.Media.Animation.Storyboard.VerifyPathIsAnimatable(PropertyPath path)
   在 System.Windows.Media.Animation.Storyboard.ClockTreeWalkRecursive(Clock currentClock, DependencyObject containingObject, INameScope nameScope, DependencyObject parentObject, String parentObjectName, PropertyPath parentPropertyPath, HandoffBehavior handoffBehavior, HybridDictionary clockMappings, Int64 layer)
   在 System.Windows.Media.Animation.Storyboard.ClockTreeWalkRecursive(Clock currentClock, DependencyObject containingObject, INameScope nameScope, DependencyObject parentObject, String parentObjectName, PropertyPath parentPropertyPath, HandoffBehavior handoffBehavior, HybridDictionary clockMappings, Int64 layer)
   在 System.Windows.Media.Animation.Storyboard.BeginCommon(DependencyObject containingObject, INameScope nameScope, HandoffBehavior handoffBehavior, Boolean isControllable, Int64 layer)
   在 System.Windows.Media.Animation.BeginStoryboard.Begin(DependencyObject targetObject, INameScope nameScope, Int64 layer)
   在 System.Windows.StyleHelper.InvokeActions(TriggerBase triggerBase, DependencyObject triggerContainer, TriggerActionCollection actions, Style style, FrameworkTemplate frameworkTemplate)
   在 System.Windows.StyleHelper.InvokeEnterOrExitActions(TriggerBase triggerBase, Boolean oldState, Boolean newState, DependencyObject triggerContainer, Style style, FrameworkTemplate frameworkTemplate)
   在 System.Windows.StyleHelper.InvokeDataTriggerActions(TriggerBase triggerBase, DependencyObject triggerContainer, BindingBase binding, BindingValueChangedEventArgs bindingChangedArgs, Style style, FrameworkTemplate frameworkTemplate, UncommonField`1 dataField)
   在 System.Windows.StyleHelper.InvokeApplicableDataTriggerActions(Style style, FrameworkTemplate frameworkTemplate, DependencyObject container, BindingBase binding, BindingValueChangedEventArgs e, UncommonField`1 dataField)
   在 System.Windows.StyleHelper.OnBindingValueInStyleChanged(Object sender, BindingValueChangedEventArgs e)
   在 System.Windows.Data.BindingExpressionBase.ChangeValue(Object newValue, Boolean notify)
   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 DynamicClass.MainViewModel.OnPropertyChanged(String propertyName)
   在 DynamicClass.列表项拖拽管理器.开始拖拽可视化(MouseEventArgs 参数)
   在 DynamicClass.列表项拖拽管理器.鼠标移动处理(Object 发送者, MouseEventArgs 参数)
   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)