问题描述
尝试在Xaml编辑器中查看用户控件时出现以下错误 - 任何想法？ System.NullReferenceException 对象引用未设置为对象的实例。 在Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion（NestedCallContext nestedCallContext，BlockingCall call，WaitHandle timeoutSignal） 在Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalOutSynchronous（Action System.NullReferenceException 对象引用未设置为对象的实例。 服务器堆栈跟踪： 在Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion（NestedCallContext nestedCallContext，BlockingCall call，WaitHandle timeoutSignal） 在Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalIn（Action System.NullReferenceException 对象引用未设置为对象的实例。 在Microsoft.Expression.DesignModel.Metadata.MetadataStore.GetTypeConverter（类型类型） 在Microsoft.Expression.WpfPlatform.WpfDesignTimeProperties.RegisterProperty（IPropertyId neutralPropertyKey，IType declaringType，
action，Int32 targetApartmentId，WaitHandle aborted，WaitHandle timeoutSignal） 在Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalOut（Action action，Int32 targetApartmentId，WaitHandle aborted，CallSynchronizationMode syncMode，
WaitHandle timeoutSignal） 在Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalOut [TValue]（RemoteHandle`1 targetObject，Action action，CallSynchronizationMode syncMode） 在Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalOut [TResult，TValue]（RemoteHandle`1
targetObject，Func`2 func，CallSynchronizationMode syncMode） 在Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.CreateDesignerImpl（IHostSourceItem项目，IHostTextEditor编辑器，RemoteCancellationToken remoteCancelToken）
at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService。<> c__DisplayClass12。< Microsoft.Expression.DesignHost.IDesignerService.CreateDesigner> b__11（RemoteCancellationToken remoteToken） 在Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.CallWithCancellation [TResult]（CancellationToken
cancelToken，Func`2 func） 在Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.Microsoft.Expression.DesignHost.IDesignerService.CreateDesigner（IHostSourceItem item，IHostTextEditor editor，CancellationToken cancelToken）
at Microsoft.Expression.DesignHost.IsolatedDesignerService.IsolatedDesignerView.CreateDesignerViewInfo（CancellationToken cancelToken）
action，Int32 targetApartmentId） 在Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalIn（IRemoteObject targetObject，Action action） 在Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalIn [TResult]（IRemoteObject
targetObject，Func`1 func） 在Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner（IRemoteHostSourceItem remoteItem，IRemoteHostTextEditor
remoteEditor，IRemoteCancellationToken remoteToken） 在System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage（IntPtr md，Object [] args，Object server，Object []& outArgs） 在System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage（IMessage
msg）在[0]处重新抛出异常： 在System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage（IMessage reqMsg，IMessage retMsg） 在System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke（MessageData& msgData，Int32 type）
at Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner（IRemoteHostSourceItem remoteItem，IRemoteHostTextEditor remoteEditor，IRemoteCancellationToken cancelToken） 在Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService。<> c__DisplayClass8。< CreateDesignerImpl> b__6（IRemoteDesignerService
d） 在Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler。<> c__DisplayClass4`2。< MarshalOut> b__3（） 在Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.Call.InvokeWorker（）
FrameworkPropertyMetadataOptions options，PropertyChangedCallback callback） 在Microsoft.Expression.WpfPlatform.WpfCommonDesignTimeProperties.Initialize（WpfDesignTimeProperties designTimeProperties） 在Microsoft.Expression.WpfPlatform.WpfDesignTimeProperties..ctor（PlatformMetadataBase
platformMetadata） 在Microsoft.Expression.WpfPlatform.WpfPlatformMetadata.OnInitialize（） 在Microsoft.Expression.WpfPlatform.WpfPlatform.Initialize（） 在Microsoft.Expression.Platform.PlatformCreatorBase.CreatePlatform（IPlatformReferenceAssemblyResolver
referenceAssemblyResolver） 在Microsoft.Expression.DesignSurface.Project.ProjectContextBase.Initialize（） 在Microsoft.Expression.DesignSurface.Project.XamlProjectContext.Initialize（） 在Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetProjectContext（IHostProject
项目，IPlatform平台，布尔创建） 在Microsoft.Expression.DesignSurface.Project.ProjectContextManager。< GetReferencedProjects> d__d.MoveNext（） 在Microsoft.Expression.DesignSurface.Project.ProjectContextBase.XamlProjectMetadata.GetAssemblyForTypeResolve（String
assemblyName） 在Microsoft.Expression.DesignModel.Metadata.TypeResolver.GetType（ClrNamespaceIdentifier clrNamespaceIdentifier，String typeName） 在Microsoft.Expression.DesignModel.Metadata.TypeResolver.ResolveType（ITypeId typeId）
at Microsoft.Expression.DesignModel.Metadata.ProjectNeutralTypesAttributeTable.ResolveType（ITypeResolver typeResolver，ITypeId typeId） 在Microsoft.Expression.DesignModel.Metadata.ProjectNeutralTypesAttributeTable.RegisterDataGridAttributeTable（ITypeResolver
typeResolver） 在Microsoft.Expression.WpfPlatform.WpfPlatform.RefreshProjectSpecificMetadata（ITypeResolver typeResolver，ITypeMetadataFactory typeMetadataFactory） 在Microsoft.Expression.DesignSurface.Project.ProjectContextBase.Initialize（）
at Microsoft.Expression.DesignSurface.Project.XamlProjectContext.Initialize（） 在Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetProjectContext（IHostProject项目，IPlatform平台，布尔创建） 在Microsoft.Expression.DesignSurface.Project.ProjectContextManager。< GetReferencedProjects> d__d.MoveNext（）
at Microsoft.Expression.DesignSurface.Project.ProjectContextBase.XamlProjectMetadata.GetAssemblyForTypeResolve（String assemblyName） 在Microsoft.Expression.DesignModel.Metadata.TypeResolver.GetType（ClrNamespaceIdentifier clrNamespaceIdentifier，
String typeName） 在Microsoft.Expression.DesignModel.Metadata.TypeResolver.ResolveType（ITypeId typeId） 在Microsoft.Expression.DesignModel.Metadata.ProjectNeutralTypesAttributeTable.ResolveType（ITypeResolver typeResolver，ITypeId typeId）
at Microsoft.Expression.DesignModel.Metadata.ProjectNeutralTypesAttributeTable.RegisterDataGridAttributeTable（ITypeResolver typeResolver） 在Microsoft.Expression.WpfPlatform.WpfPlatform.RefreshProjectSpecificMetadata（ITypeResolver typeResolver，
ITypeMetadataFactory typeMetadataFactory） 在Microsoft.Expression.DesignSurface.Project.ProjectContextBase.Initialize（） 在Microsoft.Expression.DesignSurface.Project.XamlProjectContext.Initialize（） 在Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetProjectContext（IHostProject
项目，IPlatform平台，布尔创建） 在Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetSourceItemContext（IHostSourceItem sourceItem） 在Microsoft.Expression.DesignSurface.DesignerService.CreateDesigner（IHostSourceItem
item，IHostTextEditor editor，CancellationToken cancelToken） 在Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService。<> c__DisplayClass10。<> c__DisplayClass12。< Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner> b__f（CancellationToken
cancelToken） &NBSP;&NBSP;在Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.CallWithCancellation [TResult]（IRemoteCancellationToken remoteToken，Func`2 func） 在Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService。<> c__DisplayClass10。< Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner> b__e（）
at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler。<> c__DisplayClass16`1。< MarshalIn> b__15（） 在Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.Call.InvokeWorker（）
I get the following error when trying to view a User Control in the Xaml Editor - any ideas? System.NullReferenceException Object reference not set to an instance of an object. at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion(NestedCallContext nestedCallContext, BlockingCall call, WaitHandle timeoutSignal) at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalOutSynchronous(Action action, Int32 targetApartmentId, WaitHandle aborted, WaitHandle timeoutSignal) at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalOut(Action action, Int32 targetApartmentId, WaitHandle aborted, CallSynchronizationMode syncMode, WaitHandle timeoutSignal) at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalOut[TValue](RemoteHandle`1 targetObject, Action action, CallSynchronizationMode syncMode) at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalOut[TResult,TValue](RemoteHandle`1 targetObject, Func`2 func, CallSynchronizationMode syncMode) at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.CreateDesignerImpl(IHostSourceItem item, IHostTextEditor editor, RemoteCancellationToken remoteCancelToken) at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.<>c__DisplayClass12.<Microsoft.Expression.DesignHost.IDesignerService.CreateDesigner>b__11(RemoteCancellationToken remoteToken) at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.CallWithCancellation[TResult](CancellationToken cancelToken, Func`2 func) at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.Microsoft.Expression.DesignHost.IDesignerService.CreateDesigner(IHostSourceItem item, IHostTextEditor editor, CancellationToken cancelToken) at Microsoft.Expression.DesignHost.IsolatedDesignerService.IsolatedDesignerView.CreateDesignerViewInfo(CancellationToken cancelToken) System.NullReferenceException Object reference not set to an instance of an object. Server stack trace: at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion(NestedCallContext nestedCallContext, BlockingCall call, WaitHandle timeoutSignal) at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalIn(Action action, Int32 targetApartmentId) at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalIn(IRemoteObject targetObject, Action action) at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalIn[TResult](IRemoteObject targetObject, Func`1 func) at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner(IRemoteHostSourceItem remoteItem, IRemoteHostTextEditor remoteEditor, IRemoteCancellationToken remoteToken) at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs) at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner(IRemoteHostSourceItem remoteItem, IRemoteHostTextEditor remoteEditor, IRemoteCancellationToken cancelToken) at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.<>c__DisplayClass8.<CreateDesignerImpl>b__6(IRemoteDesignerService d) at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.<>c__DisplayClass4`2.<MarshalOut>b__3() at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.Call.InvokeWorker() System.NullReferenceException Object reference not set to an instance of an object. at Microsoft.Expression.DesignModel.Metadata.MetadataStore.GetTypeConverter(Type type) at Microsoft.Expression.WpfPlatform.WpfDesignTimeProperties.RegisterProperty(IPropertyId neutralPropertyKey, IType declaringType, FrameworkPropertyMetadataOptions options, PropertyChangedCallback callback) at Microsoft.Expression.WpfPlatform.WpfCommonDesignTimeProperties.Initialize(WpfDesignTimeProperties designTimeProperties) at Microsoft.Expression.WpfPlatform.WpfDesignTimeProperties..ctor(PlatformMetadataBase platformMetadata) at Microsoft.Expression.WpfPlatform.WpfPlatformMetadata.OnInitialize() at Microsoft.Expression.WpfPlatform.WpfPlatform.Initialize() at Microsoft.Expression.Platform.PlatformCreatorBase.CreatePlatform(IPlatformReferenceAssemblyResolver referenceAssemblyResolver) at Microsoft.Expression.DesignSurface.Project.ProjectContextBase.Initialize() at Microsoft.Expression.DesignSurface.Project.XamlProjectContext.Initialize() at Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetProjectContext(IHostProject project, IPlatform platform, Boolean create) at Microsoft.Expression.DesignSurface.Project.ProjectContextManager.<GetReferencedProjects>d__d.MoveNext() at Microsoft.Expression.DesignSurface.Project.ProjectContextBase.XamlProjectMetadata.GetAssemblyForTypeResolve(String assemblyName) at Microsoft.Expression.DesignModel.Metadata.TypeResolver.GetType(ClrNamespaceIdentifier clrNamespaceIdentifier, String typeName) at Microsoft.Expression.DesignModel.Metadata.TypeResolver.ResolveType(ITypeId typeId) at Microsoft.Expression.DesignModel.Metadata.ProjectNeutralTypesAttributeTable.ResolveType(ITypeResolver typeResolver, ITypeId typeId) at Microsoft.Expression.DesignModel.Metadata.ProjectNeutralTypesAttributeTable.RegisterDataGridAttributeTable(ITypeResolver typeResolver) at Microsoft.Expression.WpfPlatform.WpfPlatform.RefreshProjectSpecificMetadata(ITypeResolver typeResolver, ITypeMetadataFactory typeMetadataFactory) at Microsoft.Expression.DesignSurface.Project.ProjectContextBase.Initialize() at Microsoft.Expression.DesignSurface.Project.XamlProjectContext.Initialize() at Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetProjectContext(IHostProject project, IPlatform platform, Boolean create) at Microsoft.Expression.DesignSurface.Project.ProjectContextManager.<GetReferencedProjects>d__d.MoveNext() at Microsoft.Expression.DesignSurface.Project.ProjectContextBase.XamlProjectMetadata.GetAssemblyForTypeResolve(String assemblyName) at Microsoft.Expression.DesignModel.Metadata.TypeResolver.GetType(ClrNamespaceIdentifier clrNamespaceIdentifier, String typeName) at Microsoft.Expression.DesignModel.Metadata.TypeResolver.ResolveType(ITypeId typeId) at Microsoft.Expression.DesignModel.Metadata.ProjectNeutralTypesAttributeTable.ResolveType(ITypeResolver typeResolver, ITypeId typeId) at Microsoft.Expression.DesignModel.Metadata.ProjectNeutralTypesAttributeTable.RegisterDataGridAttributeTable(ITypeResolver typeResolver) at Microsoft.Expression.WpfPlatform.WpfPlatform.RefreshProjectSpecificMetadata(ITypeResolver typeResolver, ITypeMetadataFactory typeMetadataFactory) at Microsoft.Expression.DesignSurface.Project.ProjectContextBase.Initialize() at Microsoft.Expression.DesignSurface.Project.XamlProjectContext.Initialize() at Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetProjectContext(IHostProject project, IPlatform platform, Boolean create) at Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetSourceItemContext(IHostSourceItem sourceItem) at Microsoft.Expression.DesignSurface.DesignerService.CreateDesigner(IHostSourceItem item, IHostTextEditor editor, CancellationToken cancelToken) at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.<>c__DisplayClass10.<>c__DisplayClass12.<Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner>b__f(CancellationToken cancelToken) at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.CallWithCancellation[TResult](IRemoteCancellationToken remoteToken, Func`2 func) at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.<>c__DisplayClass10.<Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner>b__e() at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.<>c__DisplayClass16`1.<MarshalIn>b__15() at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.Call.InvokeWorker()
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