Указанный элемент уже является логическим дочерним элементом другого элемента. Отключи его первым "
У меня есть пользовательский элемент управления, который содержит сетку, и внутри него есть расширитель, проблема в том, что когда я пытаюсь открыть новое окно, которое использует этот пользовательский элемент управления, я получаю исключение "Указанный элемент уже является логическим дочерним элементом другого элемента. Сначала отключите его"
вот мой код и его работа, когда первые окна созданы, и исключение происходит, когда показывают второе окно
<UserControl x:Class="DiagramDesigner.WindowsUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:s="clr-namespace:DiagramDesigner"
xmlns:c="clr-namespace:DiagramDesigner.Controls"
mc:Ignorable="d"
d:DesignHeight="700" d:DesignWidth="1000">
<UserControl.Resources>
<ContextMenu x:Key="DesignerCanvasContextMenu">
<MenuItem Header="Paste" Command="{x:Static ApplicationCommands.Paste}">
<MenuItem.Icon>
<Image Source="Resources/Images/Paste.png" Width="16"/>
</MenuItem.Icon>
</MenuItem>
<MenuItem Header="Select All" Command="{x:Static s:DesignerCanvas.SelectAll}"/>
</ContextMenu>
</UserControl.Resources>
<Grid Margin="10">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid Grid.Row="1" Margin="0,10,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="200"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<!-- Toolbox -->
<StackPanel Grid.Column="0" Margin="0,0,5,0">
<Expander Header="Flow Chart" Content="{StaticResource FlowChartStencils}" IsExpanded="True" />
</StackPanel>
<!-- GridSplitter -->
<GridSplitter Focusable="False" Width="2" Background="LightGray"
VerticalAlignment="Stretch" HorizontalAlignment="Right"/>
<!-- Designer -->
<GroupBox Header="Diagram" Grid.Column="1" Margin="3,0,0,0">
<ScrollViewer HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Auto">
<s:DesignerCanvas Focusable="true" x:Name="MyDesigner"
Background="{StaticResource WindowBackgroundBrush}"
Margin="10" FocusVisualStyle="{x:Null}"
ContextMenu="{StaticResource DesignerCanvasContextMenu}"/>
</ScrollViewer>
</GroupBox>
</Grid>
</Grid>
</UserControl>
2 ответа
Решение
Вы не можете повторно использовать один и тот же экземпляр UIElement для разных частей пользовательского интерфейса. Либо удалите его из первого и добавьте во второй (не рекомендуется, но есть некоторые сложные сценарии, где это имеет смысл), или просто создайте новый. Это довольно дешево.
У меня была эта ошибка, и мне удалось выяснить, почему именно она произошла методом проб и ошибок.
Эта проблема? Я использовал следующую строку XAML в обоих контекстных меню для сетки основных / подробных данных, используя DXGrid от DevExpress,
<dxb:BarItemLinkSeparator />
Как только я исправил проблему, я заметил, что трассировка стека действительно дает небольшое представление о том, какой элемент XAML вызывал ошибку. Четвертая строка в трассировке стека заканчивается этим:
[snip]ILinksHolder.OnLinkAdded(BarItemLinkBase link)
BarItemLinkBase является базовым классом для BarItemLinkSeparator, что является нашей подсказкой, что удаление указанного XAML исправит ошибку.
Для контекста, вот полная трассировка стека:
System.InvalidOperationException: Specified element is already the logical child of another element. Disconnect it first.
at System.Windows.FrameworkContentElement.ChangeLogicalParent(DependencyObject newParent)
at System.Windows.FrameworkElement.AddLogicalChild(Object child)
at DevExpress.Xpf.Bars.PopupMenu.DevExpress.Xpf.Bars.ILinksHolder.OnLinkAdded(BarItemLinkBase link)
at DevExpress.Xpf.Bars.BarItemLinkCollection.UpdateItemLinkOnAddToCollection(BarItemLinkBase itemLink)
at DevExpress.Xpf.Bars.BarItemLinkCollection.InsertItem(Int32 index, BarItemLinkBase itemLink)
at DevExpress.Xpf.Bars.CustomizablePopupMenuBase.CustomizablePopupMenuItemLinkCollection.InsertItem(Int32 index, BarItemLinkBase itemLink)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at DevExpress.Xpf.Bars.BarItemLinkBase.DevExpress.Xpf.Bars.IBarManagerControllerAction.Execute()
at DevExpress.Xpf.Bars.BarManagerActionCollection.Execute()
at DevExpress.Xpf.Bars.BarManagerActionContainer.Execute()
at DevExpress.Xpf.Bars.BarManagerController.Execute()
at DevExpress.Xpf.Bars.BarManagerMenuController.Execute()
at DevExpress.Xpf.Grid.DataControlPopupMenu.ExecuteOriginationViewMenuController(Func`2 getMenuController)
at DevExpress.Xpf.Grid.GridCellMenuInfo.ExecuteMenuController()
at DevExpress.Xpf.Bars.CustomizablePopupMenuBase.CreateItems()
at DevExpress.Xpf.Bars.CustomizablePopupMenuBase.RaiseOpening()
at DevExpress.Xpf.Bars.BarPopupBase.OnIsOpenCoerce(Object value)
at DevExpress.Xpf.Bars.PopupMenuBase.OnIsOpenCoerce(Object value)
at DevExpress.Xpf.Bars.CustomizablePopupMenuBase.OnIsOpenCoerce(Object value)
at DevExpress.Xpf.Bars.BarPopupBase.OnIsOpenCoerce(DependencyObject d, Object value)
at System.Windows.DependencyObject.ProcessCoerceValue(DependencyProperty dp, PropertyMetadata metadata, EntryIndex& entryIndex, Int32& targetIndex, EffectiveValueEntry& newEntry, EffectiveValueEntry& oldEntry, Object& oldValue, Object baseValue, Object controlValue, CoerceValueCallback coerceValueCallback, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, Boolean skipBaseValueChecks)
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.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
at System.Windows.Controls.Primitives.Popup.set_IsOpen(Boolean value)
at DevExpress.Xpf.Bars.ContextMenuManager.ShowElementContextMenu(Object contextElement, Boolean openingFromKeyboard)
at DevExpress.Xpf.Bars.ContextMenuManager.OpenContextMenu(Object sender, Boolean openingFromKeyboard)
at DevExpress.Xpf.Bars.ContextMenuManager.OnContextMenuOpening(Object sender, ContextMenuEventArgs e)
at System.Windows.Controls.ContextMenuEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
at System.Windows.Controls.PopupControlService.RaiseContextMenuOpeningEvent(IInputElement source, Double x, Double y, Boolean userInitiated)
at System.Windows.Controls.PopupControlService.ProcessMouseUp(Object sender, MouseButtonEventArgs e)
at System.Windows.Controls.PopupControlService.OnPostProcessInput(Object sender, ProcessInputEventArgs e)
at System.Windows.Input.InputManager.RaiseProcessInputEventHandlers(ProcessInputEventHandler postProcessInput, ProcessInputEventArgs processInputEventArgs)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
System.InvalidOperationException: Specified element is already the logical child of another element. Disconnect it first.
at System.Windows.FrameworkContentElement.ChangeLogicalParent(DependencyObject newParent)
at System.Windows.FrameworkElement.AddLogicalChild(Object child)
at DevExpress.Xpf.Bars.PopupMenu.DevExpress.Xpf.Bars.ILinksHolder.OnLinkAdded(BarItemLinkBase link)
at DevExpress.Xpf.Bars.BarItemLinkCollection.UpdateItemLinkOnAddToCollection(BarItemLinkBase itemLink)
at DevExpress.Xpf.Bars.BarItemLinkCollection.InsertItem(Int32 index, BarItemLinkBase itemLink)
at DevExpress.Xpf.Bars.CustomizablePopupMenuBase.CustomizablePopupMenuItemLinkCollection.InsertItem(Int32 index, BarItemLinkBase itemLink)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at DevExpress.Xpf.Bars.BarItemLinkBase.DevExpress.Xpf.Bars.IBarManagerControllerAction.Execute()
at DevExpress.Xpf.Bars.BarManagerActionCollection.Execute()
at DevExpress.Xpf.Bars.BarManagerActionContainer.Execute()
at DevExpress.Xpf.Bars.BarManagerController.Execute()
at DevExpress.Xpf.Bars.BarManagerMenuController.Execute()
at DevExpress.Xpf.Grid.DataControlPopupMenu.ExecuteOriginationViewMenuController(Func`2 getMenuController)
at DevExpress.Xpf.Grid.GridCellMenuInfo.ExecuteMenuController()
at DevExpress.Xpf.Bars.CustomizablePopupMenuBase.CreateItems()
at DevExpress.Xpf.Bars.CustomizablePopupMenuBase.RaiseOpening()
at DevExpress.Xpf.Bars.BarPopupBase.OnIsOpenCoerce(Object value)
at DevExpress.Xpf.Bars.PopupMenuBase.OnIsOpenCoerce(Object value)
at DevExpress.Xpf.Bars.CustomizablePopupMenuBase.OnIsOpenCoerce(Object value)
at DevExpress.Xpf.Bars.BarPopupBase.OnIsOpenCoerce(DependencyObject d, Object value)
at System.Windows.DependencyObject.ProcessCoerceValue(DependencyProperty dp, PropertyMetadata metadata, EntryIndex& entryIndex, Int32& targetIndex, EffectiveValueEntry& newEntry, EffectiveValueEntry& oldEntry, Object& oldValue, Object baseValue, Object controlValue, CoerceValueCallback coerceValueCallback, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, Boolean skipBaseValueChecks)
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.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
at System.Windows.Controls.Primitives.Popup.set_IsOpen(Boolean value)
at DevExpress.Xpf.Bars.ContextMenuManager.ShowElementContextMenu(Object contextElement, Boolean openingFromKeyboard)
at DevExpress.Xpf.Bars.ContextMenuManager.OpenContextMenu(Object sender, Boolean openingFromKeyboard)
at DevExpress.Xpf.Bars.ContextMenuManager.OnContextMenuOpening(Object sender, ContextMenuEventArgs e)
at System.Windows.Controls.ContextMenuEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
at System.Windows.Controls.PopupControlService.RaiseContextMenuOpeningEvent(IInputElement source, Double x, Double y, Boolean userInitiated)
at System.Windows.Controls.PopupControlService.ProcessMouseUp(Object sender, MouseButtonEventArgs e)
at System.Windows.Controls.PopupControlService.OnPostProcessInput(Object sender, ProcessInputEventArgs e)
at System.Windows.Input.InputManager.RaiseProcessInputEventHandlers(ProcessInputEventHandler postProcessInput, ProcessInputEventArgs processInputEventArgs)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)