Question

在OrchardCMS v1.8.1.0中，单击内容链接（/ Admin / Contents / List）文件名 Modules \ Orchard.MediaLibrary \ Views \ Parts \ Document.SummaryAdmin时收到以下错误消息。 CSHTML ：

对象引用未设置为对象的实例。

Source Error:

Line 3:  @{

Line 4:      DocumentPart documentPart = Model.ContentPart;
//The following line throws the exception
Line 5:      var mediaPart = ((ContentItem)Model.ContentItem).As<MediaPart>();

Line 6:  }

Line 7:

堆栈追踪：

[NullReferenceException: Object reference not set to an instance of an object.]
   ASP._Page_Modules_Orchard_MediaLibrary_Views_Parts_Document_SummaryAdmin_cshtml.Execute() in c:\inetpub\wwwroot\Modules\Orchard.MediaLibrary\Views\Parts\Document.SummaryAdmin.cshtml:5
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +279
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +124
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +124
   System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) +146
   Orchard.DisplayManagement.Descriptors.ShapeTemplateStrategy.ShapeTemplateBindingStrategy.Render(ShapeDescriptor shapeDescriptor, DisplayContext displayContext, HarvestShapeInfo harvestShapeInfo, HarvestShapeHit harvestShapeHit) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Descriptors\ShapeTemplateStrategy\ShapeTemplateBindingStrategy.cs:149
   Orchard.DisplayManagement.Descriptors.ShapeTemplateStrategy.<>c__DisplayClass28.<Discover>b__15(DisplayContext displayContext) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Descriptors\ShapeTemplateStrategy\ShapeTemplateBindingStrategy.cs:133
   Orchard.DisplayManagement.Descriptors.<>c__DisplayClass5.<BoundAs>b__2(DisplayContext displayContext) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Descriptors\ShapeAlterationBuilder.cs:56
   Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Process(ShapeBinding shapeBinding, IShape shape, DisplayContext context) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:181
   Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Execute(DisplayContext context) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:94
   Orchard.DisplayManagement.Implementation.DisplayHelper.ShapeExecute(Object shape) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:86
   Orchard.DisplayManagement.Implementation.DisplayHelper.TryInvoke(InvokeBinder binder, Object[] args, Object& result) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:30
   CallSite.Target(Closure , CallSite , Object , Object ) +219
   Orchard.Core.Shapes.CoreShapes.ContentZone(Object Display, Object Shape, TextWriter Output) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard.Web\Core\Shapes\CoreShapes.cs:274

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0
   System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +76
   System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +211
   Orchard.DisplayManagement.Descriptors.ShapeAttributeStrategy.ShapeAttributeBindingStrategy.PerformInvoke(DisplayContext displayContext, MethodInfo methodInfo, Object serviceInstance) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Descriptors\ShapeAttributeStrategy\ShapeAttributeBindingStrategy.cs:65
   Orchard.DisplayManagement.Descriptors.<>c__DisplayClass5.<BoundAs>b__2(DisplayContext displayContext) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Descriptors\ShapeAlterationBuilder.cs:56
   Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Process(ShapeBinding shapeBinding, IShape shape, DisplayContext context) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:185
   Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Execute(DisplayContext context) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:94
   Orchard.DisplayManagement.Implementation.DisplayHelper.ShapeExecute(Object shape) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:86
   Orchard.DisplayManagement.Implementation.DisplayHelper.TryInvoke(InvokeBinder binder, Object[] args, Object& result) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:30
   CallSite.Target(Closure , CallSite , Object , Object ) +220
   ASP._Page_Core_Contents_Views_Content_SummaryAdmin_cshtml.Execute() in c:\inetpub\wwwroot\Core\Contents\Views\Content.SummaryAdmin.cshtml:13
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +280
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +125
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +125
   System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) +147
   Orchard.DisplayManagement.Descriptors.ShapeTemplateStrategy.ShapeTemplateBindingStrategy.Render(ShapeDescriptor shapeDescriptor, DisplayContext displayContext, HarvestShapeInfo harvestShapeInfo, HarvestShapeHit harvestShapeHit) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Descriptors\ShapeTemplateStrategy\ShapeTemplateBindingStrategy.cs:151
   Orchard.DisplayManagement.Descriptors.ShapeTemplateStrategy.<>c__DisplayClass28.<Discover>b__15(DisplayContext displayContext) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Descriptors\ShapeTemplateStrategy\ShapeTemplateBindingStrategy.cs:133
   Orchard.DisplayManagement.Descriptors.<>c__DisplayClass5.<BoundAs>b__2(DisplayContext displayContext) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Descriptors\ShapeAlterationBuilder.cs:56
   Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Process(ShapeBinding shapeBinding, IShape shape, DisplayContext context) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:185
   Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Execute(DisplayContext context) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:94
   Orchard.DisplayManagement.Implementation.DisplayHelper.ShapeExecute(Object shape) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:86
   Orchard.DisplayManagement.Implementation.DisplayHelper.TryInvoke(InvokeBinder binder, Object[] args, Object& result) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:30
   CallSite.Target(Closure , CallSite , Object , Object ) +220
   Orchard.Core.Shapes.CoreShapes.List(Object Display, TextWriter Output, IEnumerable`1 Items, String Tag, String Id, IEnumerable`1 Classes, IDictionary`2 Attributes, String ItemTag, IEnumerable`1 ItemClasses, IDictionary`2 ItemAttributes) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard.Web\Core\Shapes\CoreShapes.cs:687

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0
   System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +76
   System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +211
   Orchard.DisplayManagement.Descriptors.ShapeAttributeStrategy.ShapeAttributeBindingStrategy.PerformInvoke(DisplayContext displayContext, MethodInfo methodInfo, Object serviceInstance) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Descriptors\ShapeAttributeStrategy\ShapeAttributeBindingStrategy.cs:65
   Orchard.DisplayManagement.Descriptors.<>c__DisplayClass5.<BoundAs>b__2(DisplayContext displayContext) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Descriptors\ShapeAlterationBuilder.cs:56
   Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Process(ShapeBinding shapeBinding, IShape shape, DisplayContext context) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:185
   Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Execute(DisplayContext context) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:94
   Orchard.DisplayManagement.Implementation.DisplayHelper.ShapeExecute(Object shape) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:86
   Orchard.DisplayManagement.Implementation.DisplayHelper.TryInvoke(InvokeBinder binder, Object[] args, Object& result) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:30
   CallSite.Target(Closure , CallSite , Object , Object ) +220
   ASP._Page_Core_Contents_Views_Admin_List_cshtml.Execute() in c:\inetpub\wwwroot\Core\Contents\Views\Admin\List.cshtml:52
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +280
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +125
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +125
   Orchard.Mvc.ViewEngines.ThemeAwareness.<>c__DisplayClass7.<FindView>b__5(ViewContext viewContext, TextWriter writer, IViewDataContainer viewDataContainer) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\Mvc\ViewEngines\ThemeAwareness\LayoutAwareViewEngine.cs:60
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +380
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +109
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +890
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +97
   System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +241
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +29
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +111
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +53
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +19
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +51
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +111
   Orchard.Mvc.Routes.HttpAsyncHandler.EndProcessRequest(IAsyncResult result) in z:\Builds\work\d1eb156ccc3cb14\src\Orchard\Mvc\Routes\ShellRoute.cs:159
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +606
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +288

Answer 1

看起来某种程度上MediaPart没有附加到Document内容类型，而它预计会是。

将媒体部分附加到文档内容类型，并将其刻板印象设置为“媒体”。（两者都可以在仪表板中完成。）

在Orchard CMS中查看Content页面时出现NullReference异常

1 个答案: