为什么这个WPF TreeViewItem风格导致交叉线程问题？

2018-06-10 07:19:48

我有以下样式应用于treeviewitem容器。基本上，用于覆盖选择颜色：

<Style x:Key="element-designer-node-host" TargetType="{x:Type TreeViewItem}">
    <Style.Resources>
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" 
                         Color="{DynamicResource nav-tvi-sel-bg1}" />
        <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" 
                         Color="{DynamicResource nav-tvi-sel-bg1}" />
        <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}" 
                         Color="{DynamicResource nav-tvi-sel-bg2}" />
    </Style.Resources>
    <Setter Property="IsExpanded" Value="{Binding Expanded, Mode=TwoWay}" />
    <Setter Property="IsSelected" Value="{Binding Selected, Mode=TwoWay}" />
</Style>

应用于树视图：

<TreeView
    ItemContainerStyle="{StaticResource element-designer-node-host}"
    ItemsSource="{Binding Nodes}">

现在，我在一个新线程中启动一个带有这个树视图的窗口，并且一切正常。

在那个窗口关闭之后，我在一个全新的线程中开始全新的窗口，当我尝试点击某个节点时，出现异常：

调用线程不能访问这个对象，因为不同的线程拥有它。

在System.Windows.Threading.Dispatcher.VerifyAccess（）在System.Windows.Freezable.System.Windows.ISealable.get_IsSealed（）在System.Windows.StyleHelper.SealIfSealable（对象的值）在System.Windows.StyleHelper.GetChildValueHelper（UncommonField 1 dataField, ItemStructList System.Windows.StyleHelper.GetChildValue（UncommonField 1 dataField, DependencyObject container, Int32 childIndex, FrameworkObject child, DependencyProperty dp, FrugalStructList 1 dataField, ItemStructList 1＆valueLookupList，DependencyProperty dp，DependencyObject container，FrameworkObject child，Int32 childIndex，Boolean styleLookup，EffectiveValueEntry＆entry，ValueLookupType＆sourceType，FrameworkElementFactory templateRoot）在System.Windows.StyleHelper.GetValueFromTemplatedParent（DependencyObject容器，Int32 childIndex，FrameworkObject子级，DependencyProperty dp，FrugalStructList 1& childRecordFromChildIndex, FrameworkElementFactory templateRoot, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.GetValueFromTemplatedParent(DependencyProperty dp, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.GetRawValue(DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.EvaluateBaseValueCore(DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry& newEntry) at System.Windows.DependencyObject.EvaluateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry newEntry, OperationType operationType) at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType) at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue) at System.Windows.StyleHelper.InvalidateDependents(Style ownerStyle, FrameworkTemplate frameworkTemplate, DependencyObject container, DependencyProperty dp, FrugalStructList ）中的1 dataField, DependencyObject container, Int32 childIndex, FrameworkObject child, DependencyProperty dp, FrugalStructList 1＆childRecordFromChildIndex，EffectiveValueEntry＆entry，ValueLookupType＆sourceType，FrameworkElementFactory templateRoot） 1& childRecordFromChildIndex, FrameworkElementFactory templateRoot, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.GetValueFromTemplatedParent(DependencyProperty dp, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.GetRawValue(DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.EvaluateBaseValueCore(DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry& newEntry) at System.Windows.DependencyObject.EvaluateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry newEntry, OperationType operationType) at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType) at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue) at System.Windows.StyleHelper.InvalidateDependents(Style ownerStyle, FrameworkTemplate frameworkTemplate, DependencyObject container, DependencyProperty dp, FrugalStructList 在System.Windows.StyleHelper.OnTriggerSourcePropertyInvalidated（Style ownerStyle，FrameworkTemplate frameworkTemplate，DependencyObject容器，DependencyProperty dp，DependencyPropertyChangedEventArgs changedArgs）中1& childRecordFromChildIndex, FrameworkElementFactory templateRoot, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.GetValueFromTemplatedParent(DependencyProperty dp, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.GetRawValue(DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.EvaluateBaseValueCore(DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry& newEntry) at System.Windows.DependencyObject.EvaluateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry newEntry, OperationType operationType) at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType) at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue) at System.Windows.StyleHelper.InvalidateDependents(Style ownerStyle, FrameworkTemplate frameworkTemplate, DependencyObject container, DependencyProperty dp, FrugalStructList 1＆dependents，Boolean invalidateOnlyContainer），布尔invalidateOnlyContainer，在System.Windows.DependencyObject.UpdateEffectiveValue FrugalStructList`1＆在System.Windows.FrameworkElement.OnPropertyChanged triggerSourceRecordFromChildIndex，FrugalMap＆propertyTriggersWithActions，的Int32 sourceChildIndex）（DependencyPropertyChangedEventArgs e）上System.Windows.DependencyObject.NotifyPropertyChange（DependencyPropertyChangedEventArgs参数）（entryIndex entryIndex ，DependencyProperty dp，PropertyMetadata元数据，EffectiveValueEntry oldEntry，EffectiveValueEntry＆newEntry，布尔coerceWithDeferredReference， System.Windows.DependencyObject.SetValueCommon（DependencyProperty dp，Object value，PropertyMetadata metadata，Boolean coerceWithDeferredReference，Boolean coerceWithCurrentValue，OperationType operationType，Boolean isInternal）在System.Windows.DependencyObject.SetValue（DependencyProperty dp，Object value））System.Windows.Controls.TreeView.ChangeSelection（Object data，TreeViewItem container，Boolean selected）在System.Windows.Controls.TreeViewItem.Select（布尔选中）在System.Windows.Controls.TreeViewItem.OnGotFocus（RoutedEventArgs e）
在System.Windows.UIElement.IsFocused_Changed（的DependencyObject d，DependencyPropertyChangedEventArgs e）上System.Windows.DependencyObject.OnPropertyChanged（DependencyPropertyChangedEventArgs e）上System.Windows.FrameworkElement.OnPropertyChanged（DependencyPropertyChangedEventArgs e）上System.Windows.DependencyObject.NotifyPropertyChange（DependencyPropertyChangedEventArgs ARGS ）在System.Windows.DependencyObject.UpdateEffectiveValue（EntryIndex entryIndex，DependencyProperty dp，PropertyMetadata元数据，EffectiveValueEntry oldEntry，EffectiveValueEntry＆newEntry，布尔coerceWithDeferredReference，布尔coerceWithCurrentValue，OperationType操作类型）在System.Windows.DependencyObject.SetValueCommon（DependencyProperty dp，对象值，PropertyMetadata在System.Wi上System.Windows.DependencyObject.SetValue（DependencyPropertyKey键，对象值）的布尔coerceWithDeferredReference，布尔coerceWithCurrentValue，OperationType操作类型，布尔isInternal） ndows.Input.FocusManager.OnFocusedElementChanged（DependencyObject的d，DependencyPropertyChangedEventArgs e）上System.Windows.DependencyObject.OnPropertyChanged（DependencyPropertyChangedEventArgs e）上System.Windows.FrameworkElement.OnPropertyChanged（DependencyPropertyChangedEventArgs e）上System.Windows.DependencyObject.NotifyPropertyChange（DependencyPropertyChangedEventArgs参数） System.Windows.DependencyObject.SetValueCommon（System.Windows.DependencyObject.UpdateEffectiveValue（EntryIndex entryIndex，DependencyProperty dp，PropertyMetadata metadata，EffectiveValueEntry oldEntry，EffectiveValueEntry＆newEntry，Boolean coerceWithDeferredReference，Boolean coerceWithCurrentValue，OperationType operationType），布尔coerceWithDeferredReference，布尔coerceWithCurrentValue，OperationType操作类型，布尔isInternal）在System.Windows.Input.FocusManager.SetFocusedElement（DependencyObject元素，IInputElement 值System.Windows.Input.KeyboardNavigation.UpdateFocusedElement（DependencyObject focusTarget）System.Windows.FrameworkElement.OnGotKeyboardFocus（Object sender，KeyboardFocusChangedEventArgs e）at System.Windows.Input.KeyboardFocusChangedEventArgs.InvokeEventHandler（Delegate genericHandler，Object genericTarget）at System在System.Windows .Windows.RoutedEventArgs.InvokeHandler（委托处理程序，对象目标）在System.Windows.RoutedEventHandlerInfo.InvokeHandler（对象目标，RoutedEventArgs routedEventArgs）在System.Windows.EventRoute.InvokeHandlersImpl（对象源，RoutedEventArgs指定参数时，布尔再加注） .UIElement.RaiseEventImpl（DependencyObject的发件人，RoutedEventArgs参数）在System.Windows.UIElement.RaiseTrustedEvent（RoutedEventArgs参数）在System.Windows.UIElement.RaiseEvent（RoutedEventArgs指定参数时，布尔信任）在System.Windows.Input.InputManager.ProcessStagingArea（）在System.Windows.Input的System.Windows.Input.InputManager.ProcessInput（InputEventArgs输入）在System.Windows.In.Input.KeyboardDevice.TryChangeFocus（DependencyObject newFocus，IKeyboardInputProvider keyboardInputProvider，布尔askOld，布尔askNew，布尔forceToNullIfFailed）System.Windows.Input.KeyboardDevice.Focus（DependencyObject焦点）上的.KeyboardDevice.ChangeFocus（DependencyObject焦点，Int32时间戳），布尔askOld，布尔askNew，布尔forceToNullIfFailed）在System.Windows.Input.KeyboardDevice.Focus（IInputElement元件）在System.Windows.UIElement.Focus（）在System.Windows.Controls.TreeViewItem.OnMouseLeftButtonDown（MouseButtonEventArgs E）在系统.Windows.UIElement.OnMouseLeftButtonDownThunk（对象发件人，MouseButtonEventArgs e）上System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler在System.Windows（代表genericHandler，对象genericTarget）在System.Windows.RoutedEventArgs.InvokeHandler（委托处理程序，对象目标）。在System.Windows.EventRoute.Invok RoutedEventHandlerInfo.InvokeHandler（对象目标，RoutedEventArgs routedEventArgs） eHandlersImpl在System.Windows.UIElement.OnMouseDownThunk在System.Windows.UIElement.ReRaiseEventAs（对象源，RoutedEventArgs指定参数时，布尔再加注）（DependencyObject的发件人，RoutedEventArgs指定参数时，RoutedEvent newEvent）（对象发件人，MouseButtonEventArgs E）...

为什么会发生这种情况，解决方案是什么？

请注意，当我从样式资源中删除这三个笔刷覆盖时，问题不会发生。

看起来样式的实际引用保留在element-designer-node-host的内存中。这使得引用的所有者成为已被销毁的线程。来自MSDN的更多信息。
这可能与第一次使用这些资源的新线程有关，但是没有看到更多的代码，这更像是一种猜测。
解决方法是在UI线程上创建新Window ，或者使用x:Shared="false"创建新Window ，然后使用新创建的每个用法的引用，而不是使用共享引用。请记住，这会增加应用程序的内存占用量，并且如果目标计算机的可用内存量有限，则可能会导致内存不足异常。
来自MSDN的更多信息 - OutOfMemoryException。

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