results from typedcontentatxpath throw exception when enumerated - Templates, (partial) views and macros

Matt Geal 4 posts 74 karma points

Mar 31, 2017 @ 15:10

Results from TypedContentAtXpath() throw exception when enumerated

Hi guys,

Hoping you can help me here. I'm grabbing all IPublishedContent of a particular document type using Umbraco.TypedContentAtXPath("//docType"); This works fine and seems to return an IEnumberable

    [NullReferenceException: Object reference not set to an instance of an object.]
   Umbraco.Web.PublishedCache.XmlPublishedCache.XmlPublishedContent.Get(XmlNode node, Boolean isPreviewing) +94
   System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +222

It's almost as if there is an entry in the Umbraco XML cache that doesn't exist in the database. I've tried clearing the app data folder. Recyling the app pool, performing a republish all but none of these have helped.

There's definitely something wrong with the IPublishedContent collection that is coming back from Umbraco because performing .ToList() and .Count() methods on it both throw a similar error.

Please help!

Thanks, Matt.

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Rune Hem Strand 147 posts 911 karma points hq c-trib

Apr 04, 2017 @ 19:33

Hi Matt

Can't say I have experienced that :-| Would be great with a little more information.

Are the indexes ok?
Does Data integrity check pass?
What Umbraco version are you running?
Is that the full error message?
Finally, are there items in the recycle bin? If so could you try deleting them and see if that helps? Seem to remember that causing an issue at some point.

All the best
Rune

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Matt Geal 4 posts 74 karma points

Apr 05, 2017 @ 09:08

Thanks for taking the time to reply Rune.

I had already tried rebuilding the indexes, it doesn't seem to make a difference.

The data integrity check comes back as ok.

The full error message is:

    [NullReferenceException: Object reference not set to an instance of an object.]
   Umbraco.Web.PublishedCache.XmlPublishedCache.XmlPublishedContent.Get(XmlNode node, Boolean isPreviewing) +94
   System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +222
   ASP._Page_Views_MyTT_cshtml.Execute() in d:\Sites\WebSites\TT\TT-Staging\Views\MyTT.cshtml:159
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +252
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +147
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +106
   Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) +231
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +374
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +89
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +833
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +833
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +833
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +81
   System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +186
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +38
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +29
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +65
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +53
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +36
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +38
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +44
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +65
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +399
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +137

The code I'm running is:

var ttAuthors = Umbraco.TypedContentAtXPath( "//author" );
foreach ( IPublishedContent author in ttAuthors ) {
    if ( author != null ) {
        if ( author.Name == pm.MentorName ) {
            matchingAuthor = author;
            break;
        }
    }
}

I can happily step through the foreach statment in the debugger for several content items until it throws an error when attempting to get the next IPublishedContent item out of the collection.

I already checked the recycle bin too! It's completely empty as far as I can tell.

The site is running on Umbraco version 7.5.0 assembly: 1.0.6073.15895

Is there anywhere I can check in the cms/umbraco tables to see what might be going wrong?

Cheers, Matt.

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Chris Kim 48 posts 254 karma points c-trib

Sep 07, 2018 @ 00:53

I recognise this is an old thread, but if anyone has the same issue, make sure none of your document types have a property with an alias matching the document type alias you are trying to retrieve. It's easiest to find in the XML cache in App_Data/umbraco.config

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Rune Hem Strand 147 posts 911 karma points hq c-trib

Sep 07, 2018 @ 06:34

Hi Chris,

that makes a whole bunch of sense and is most likely the reason for the error described above.

Thanks for taking the time to reply to an old thread - Really helpful!

h5yr 🙌
/rune

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Results from TypedContentAtXpath() throw exception when enumerated