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我有一个用户控件，其资源如下：

<UserControl.Resources>

    <Image x:Key="IconPrinter" Source="/PrintViewerWPF;component/Resources/Images/printer.png" />

    <MenuItem x:Key="PrintDoc" 
              Header="Print" 
              Click="PrintDoc_OnClick"
              Icon="{StaticResource IconPrinter}" />

    <ContextMenu x:Key="MergedContextMenu">
        <StaticResource ResourceKey="PrintDoc"/>
    </ContextMenu>

    <ContextMenu x:Key="SingleContextMenu">
        <StaticResource ResourceKey="PrintDoc"/>
    </ContextMenu>

    <DataTemplate x:Key="mergedDocDisplayGrid">
        <StackPanel StackPanel.ContextMenu="{DynamicResource MergedContextMenu}" />
    </DataTemplate>

    <DataTemplate x:Key="singleDocDisplayGrid">
        <StackPanel StackPanel.ContextMenu="{DynamicResource SingleContextMenu}" />
    </DataTemplate>

</UserControl.Resources>

s在DataTemplateDevExpress 中使用FlowLayoutControl

在我的场景中，我的FlowLayoutControl. 一个使用模板mergedDocDisplayGrid，另一个使用singleDocDisplayGrid

数据在模板中正确显示，鼠标活动和拖放等其他功能已成功实现

在其中一个项目上显示上下文菜单有效，但如果我随后尝试在另一个项目上再次显示上下文菜单，则会出现以下异常：

Message - Add value to collection of type 'System.Windows.Controls.ItemCollection' threw an exception.

Inner - Element already has a logical parent. It must be detached from the old parent before it is attached to a new one.

Stack Trace
   at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
   at System.Windows.Markup.WpfXamlLoader.LoadDeferredContent(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings parentSettings, Uri baseUri)
   at System.Windows.ResourceDictionary.CreateObject(KeyRecord key)
   at System.Windows.ResourceDictionary.OnGettingValue(Object key, Object& value, Boolean& canCache)
   at System.Windows.ResourceDictionary.OnGettingValuePrivate(Object key, Object& value, Boolean& canCache)
   at System.Windows.ResourceDictionary.GetValueWithoutLock(Object key, Boolean& canCache)
   at System.Windows.ResourceDictionary.GetValue(Object key, Boolean& canCache)
   at System.Windows.DeferredResourceReference.GetValue(BaseValueSourceInternal valueSource)
   at System.Windows.DependencyObject.GetEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, RequestFlags requests)
   at System.Windows.DependencyObject.GetValueEntry(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, RequestFlags requests)
   at System.Windows.DependencyObject.GetValue(DependencyProperty dp)
   at System.Windows.Controls.ContextMenuService.GetContextMenu(DependencyObject element)
   at System.Windows.Controls.ContextMenuService.ContextMenuIsEnabled(DependencyObject o)
   at System.Windows.Controls.ContextMenuService.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)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
   at System.Windows.Forms.NativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at System.Windows.Application.Run(Window window)
   at System.Windows.Application.Run()
   at Camps.PrintViewerWPF.App.Main() in C:\Dev\Camps.Printing2\trunk\Camps.Printing2\Presentation\Camps.PrintViewerWPF\obj\x86\Release\App.g.cs:line 0
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

内部异常是不言自明的，我相信我可以在后面的代码中解决这个问题，但是我觉得必须在 XAML 中正确地做到这一点，因为重用菜单项很重要我

任何帮助将不胜感激！谢谢

4

1 回答 1

6

尝试StaticResourceExtension和x:Shared="false"。

<MenuItem x:Key="PrintDoc" 
          x:Shared="false"              
          Header="Print" 
          Click="PrintDoc_OnClick"
          Icon="{StaticResource IconPrinter}" />

<ContextMenu x:Key="MergedContextMenu">
    <StaticResourceExtension ResourceKey="PrintDoc" />
</ContextMenu>

检查此链接。

于 2014-01-03T13:42:51.200 回答