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當我在WPF 4.0中插入InvokeCommandAction（Blend 4 SDK）時遇到問題。 usercontrol不顯示，我有一些例外。 （登錄底部） 沒有我的xaml代碼中的行，沒有問題（但沒有事件觸發器）。WPF 4.0 InvokeCommandAction兼容性（System.Windows.Interactivity）
我已經在外部燈光項目中測試了這部分代碼，它的工作完美！ 也許InvokeCommandAction與may app中的某些東西不兼容，但是什麼？
<UserControl x:Class="Project.Views.Menu.TestView"
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:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:Menu="clr-namespace:Project.ViewModels.Menu"
mc:Ignorable="d"
x:Name="test"
d:DesignHeight="300" d:DesignWidth="300">
<UserControl.DataContext>
<Menu:TestViewModel />
</UserControl.DataContext>
<Grid>
<ListBox x:Name="listBox" Width="200"
MaxHeight="128" SelectionMode="Single" Margin="0">
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<i:InvokeCommandAction Command="{Binding TestCommand, Mode=OneWay}" CommandParameter="{Binding SelectedItem, ElementName=listBox}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
<ListBoxItem>blabla1</ListBoxItem>
<ListBoxItem>blabla2</ListBoxItem>
<ListBoxItem>blabla3</ListBoxItem>
<ListBoxItem>blabla4</ListBoxItem>
</ListBox>
</Grid>
</UserControl>
我已經登錄的錯誤，但我不明白：
ERROR 2011-07-26 15:18:47 – La référence d'objet n'est pas définie à une instance d'un objet.
PresentationFramework
à System.Windows.Markup.WpfXamlLoader.TransformNodes(XamlReader xamlReader, XamlObjectWriter xamlWriter, Boolean onlyLoadOneNode, Boolean skipJournaledProperties, Boolean shouldPassLineNumberInfo, IXamlLineInfo xamlLineInfo, IXamlLineInfoConsumer xamlLineInfoConsumer, XamlContextStack`1 stack, IStyleConnector styleConnector)
à System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
à System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
à System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
à System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
à Project.Views.Menu.TestView.InitializeComponent() dans C:\Project\Views\Menu\TestView.xaml:ligne 1
à Project.Views.Menu.TestView..ctor() dans C:\Project\Views\Menu\TestView.xaml.cs:ligne 24
à Project.ViewModels.MainWindowsViewModel..ctor() dans C:\Project\ViewModels\MainWindowsViewModel.cs:ligne 52
ERROR 2011-07-26 15:18:47 – Une exception a été levée par la cible d'un appel.
mscorlib
à System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)
à System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache)
à System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache)
à System.Activator.CreateInstance(Type type, Boolean nonPublic)
à System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
à System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
à System.Xaml.Schema.XamlTypeInvoker.CreateInstance(Object[] arguments)
à MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateInstanceWithCtor(XamlType xamlType, Object[] args)
à MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateInstance(XamlType xamlType, Object[] args)
à System.Xaml.XamlObjectWriter.Logic_CreateAndAssignToParentStart(ObjectWriterContext ctx)
à System.Xaml.XamlObjectWriter.WriteEndObject()
à System.Xaml.XamlWriter.WriteNode(XamlReader reader)
à System.Windows.Markup.WpfXamlLoader.TransformNodes(XamlReader xamlReader, XamlObjectWriter xamlWriter, Boolean onlyLoadOneNode, Boolean skipJournaledProperties, Boolean shouldPassLineNumberInfo, IXamlLineInfo xamlLineInfo, IXamlLineInfoConsumer xamlLineInfoConsumer, XamlContextStack`1 stack, IStyleConnector styleConnector)
à System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
à System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
à System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
à System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
à Project.MainWindow.InitializeComponent() dans C:\Project\MainWindow.xaml:ligne 1
à Project.MainWindow..ctor() dans C:\Project\MainWindow.xaml.cs:ligne 17
ERROR 2011-07-26 15:18:47 – Une exception a été levée par la cible d'un appel.
mscorlib
à System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)
à System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache)
à System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache)
à System.Activator.CreateInstance(Type type, Boolean nonPublic)
à System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
à System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
à System.Xaml.Schema.XamlTypeInvoker.CreateInstance(Object[] arguments)
à MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateInstanceWithCtor(XamlType xamlType, Object[] args)
à MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateInstance(XamlType xamlType, Object[] args)
à System.Xaml.XamlObjectWriter.Logic_CreateAndAssignToParentStart(ObjectWriterContext ctx)
à System.Xaml.XamlObjectWriter.WriteStartMember(XamlMember property)
à System.Xaml.XamlWriter.WriteNode(XamlReader reader)
à System.Windows.Markup.WpfXamlLoader.TransformNodes(XamlReader xamlReader, XamlObjectWriter xamlWriter, Boolean onlyLoadOneNode, Boolean skipJournaledProperties, Boolean shouldPassLineNumberInfo, IXamlLineInfo xamlLineInfo, IXamlLineInfoConsumer xamlLineInfoConsumer, XamlContextStack`1 stack, IStyleConnector styleConnector)
à System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
à System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
à System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
à System.Windows.Application.LoadBamlStreamWithSyncInfo(Stream stream, ParserContext pc)
à System.Windows.Application.LoadComponent(Uri resourceLocator, Boolean bSkipJournaledProperties)
à System.Windows.Application.DoStartup()
à System.Windows.Application.b__1(Object unused)
à System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
à MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)