我正在尝试执行一个简单的 A/B 测试。
有一种布局只有一个占位符。
<div>
@Html.Sitecore().Placeholder("main") //breakpoint here which throws exception
</div>
然后是一个视图渲染（称为部分），其数据源必须加载到占位符内。默认情况下，Section分配一个数据源项Text1。我可以在体验编辑器中查看所需的结果。
现在，我添加了另一个变体，只需将相同渲染的数据源更改为Text2. 我可以在浮动框中看到两个变体以及手动更改变体时更改的文本。
我单击保存并尝试在体验编辑器中再次打开该页面，但出现此异常。
Sitecore.Mvc.Analytics.dll 中出现“System.NullReferenceException”类型的异常，但未在用户代码中处理
添加第二个变体后，我现在无法在体验编辑器中查看此页面。
该页面分配给 sitecore 的示例工作流。我还在 Visual Studio 解决方案中添加了 Sitecore.Analytics.dll 和 Sitecore.Mvc.Analytics.dll。
如何解决这个问题？
将 Sitecore 8.2 与 VS2015 一起使用
错误日志 我检查了错误日志，它在某一点上说明了布局。布局存在，使用相同布局的其他页面工作正常。添加第二个变体并在 exp 中查看后会出现问题。编辑。在预览模式下查看时可以正常工作！
这是记录的日志。希望它能说明一些事情......
ManagedPoolThread #11 10:40:21 INFO Job ended: Sitecore.ListManagement.Analytics.UnlockContactListsAgent (units processed: )
12968 10:40:28 ERROR Application error.
Exception: System.Web.HttpUnhandledException
Message: An unhandled exception occurred.
Source: Sitecore.Mvc
at Sitecore.Mvc.Pipelines.MvcEvents.Exception.ShowAspNetErrorMessage.ShowErrorMessage(ExceptionContext exceptionContext, ExceptionArgs args)
at Sitecore.Mvc.Pipelines.MvcEvents.Exception.ShowAspNetErrorMessage.Process(ExceptionArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Mvc.Pipelines.PipelineService.RunPipeline[TArgs](String pipelineName, TArgs args)
at Sitecore.Mvc.Filters.PipelineBasedRequestFilter.OnException(ExceptionContext exceptionContext)
at System.Web.Mvc.ControllerActionInvoker.InvokeExceptionFilters(ControllerContext controllerContext, IList`1 filters, Exception exception)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
at Sitecore.Mvc.Controllers.SitecoreActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
at System.Web.Mvc.Controller.<>c__DisplayClass22.<BeginExecuteCore>b__1e()
at System.Web.Mvc.Async.AsyncResultWrapper.<.cctor>b__0(IAsyncResult asyncResult, Action action)
at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult)
at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult)
at Sitecore.Mvc.Routing.RouteHttpHandler.EndProcessRequest(IAsyncResult result)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Nested Exception
Exception: System.InvalidOperationException
Message: Error while rendering view: '/Views/CampaignLayout.cshtml' (model: 'Sitecore.Mvc.Presentation.RenderingModel, Sitecore.Mvc').
Source: Sitecore.Mvc
at Sitecore.Mvc.Presentation.ViewRenderer.Render(TextWriter writer)
at Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer.Render(Renderer renderer, TextWriter writer, RenderRenderingArgs args)
at Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer.Process(RenderRenderingArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Mvc.Pipelines.PipelineService.RunPipeline[TArgs](String pipelineName, TArgs args)
at Sitecore.Mvc.Presentation.RenderingView.Render(ViewContext viewContext, TextWriter writer)
at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
Nested Exception
Exception: System.NullReferenceException
Message: Object reference not set to an instance of an object.
Source: Sitecore.Mvc.Analytics
at Sitecore.Mvc.Analytics.Pipelines.Response.CustomizeRendering.SelectVariation.GetTestCombination(Item variableItem, Item contextItem, ID deviceId)
at Sitecore.Mvc.Analytics.Pipelines.Response.CustomizeRendering.SelectVariation.GetVariation(Item variableItem, Item contextItem, ID deviceId)
at Sitecore.Mvc.Analytics.Pipelines.Response.CustomizeRendering.SelectVariation.Evaluate(CustomizeRenderingArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Mvc.Pipelines.PipelineService.RunPipeline[TArgs](String pipelineName, TArgs args)
at Sitecore.Mvc.Pipelines.PipelineService.RunPipeline[TArgs,TResult](String pipelineName, TArgs args, Func`2 resultGetter)
at Sitecore.Mvc.Analytics.Pipelines.Response.GetRenderer.CustomizeRendering.Process(GetRendererArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Mvc.Pipelines.PipelineService.RunPipeline[TArgs](String pipelineName, TArgs args)
at Sitecore.Mvc.Pipelines.PipelineService.RunPipeline[TArgs,TResult](String pipelineName, TArgs args, Func`2 resultGetter)
at Sitecore.Mvc.Presentation.Rendering.GetRenderer()
at Sitecore.Mvc.Presentation.Rendering.get_Renderer()
at Sitecore.Mvc.Presentation.Rendering.ToString()
at Sitecore.Mvc.Pipelines.Response.RenderRendering.InitializeProfiling.StartProfiling(RenderRenderingArgs args)
at Sitecore.Mvc.Pipelines.Response.RenderRendering.InitializeProfiling.Process(RenderRenderingArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Mvc.Pipelines.PipelineService.RunPipeline[TArgs](String pipelineName, TArgs args)
at Sitecore.Mvc.Pipelines.Response.RenderPlaceholder.PerformRendering.Render(String placeholderName, TextWriter writer, RenderPlaceholderArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Mvc.Pipelines.PipelineService.RunPipeline[TArgs](String pipelineName, TArgs args)
at Sitecore.Mvc.Helpers.SitecoreHelper.Placeholder(String placeholderName)
at ASP._Page_Views_CampaignLayout_cshtml.Execute() in c:\inetpub\wwwroot\democore\Website\Views\CampaignLayout.cshtml:line 45
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
at Sitecore.Mvc.Presentation.ViewRenderer.Render(TextWriter writer)
12968 10:40:28 INFO Cache created: 'Log singles' (max size: 100KB, running total: 2297MB)
12968 10:40:28 WARN Page extenders were not added, because an error occurred during the request execution
ManagedPoolThread #6 10:40:31 INFO Job started: Sitecore.ListManagement.Analytics.UnlockContactListsAgent
ManagedPoolThread #6 10:40:31 INFO Job ended: Sitecore.ListManagement.Analytics.UnlockContactListsAgent (units processed: )
ManagedPoolThread #7 10:40:41 INFO Job started: Sitecore.ListManagement.Analytics.UnlockContactListsAgent
ManagedPoolThread #7 10:40:41 INFO Job ended: Sitecore.ListManagement.Analytics.UnlockContactListsAgent (units processed: )