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POdouble order by in Dynamics CRM 2011 Linq query
 

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    <p>I'm developing a survey module for CRM 2011, where a CRM user can make a survey with multiple questions of different types and ask contacts to answer them using a dynamic web page on Azure. I have completed about 90% of it so far and just need to add a few minor changes involving data management.</p> <p>The part I'm currently optimizing involves sorting my questions. I have 2 entities in CRM: surveyquestion and question. question refers to an actual question in the survey, while surveyquestion is an N-N relationship entity with a few additional fields, so we can reuse questions in different surveys. I have a field "groep" in "question" which is used to indicate whether a question should be grouped with another question on the form. I have another field, "volgorde" in "surveyquestion", which is used to indicate the order of the questions. I wish to show all questions with the same "group" together, and then order any questions inside groups (and ungrouped questions as a separate group) by the sortorder field. So I basically need to order on 2 fields in 2 different tables, which seems to be quite tricky.</p> <p>This is the code I'm currently using. I'm getting a nullreferenceexception on the join for vraaglist, which is weird because both vr.Id and ev.slfn_vraag.Id have data in the relevant rows. I don't think it's due to the orderby, because the commented code above works (but I cannot simply add ev.volgorde to my orderby because he complains about that.</p> <pre><code>public List&lt;slfn_vraag&gt; GetVragenforEnquete(Guid enGuid) { //List&lt;slfn_vraag&gt; vraaglist = (from vr in _oContext.slfn_vraagSet // join ev in _oContext.slfn_enquetevraagSet on vr.Id equals ev.slfn_vraag.Id // orderby vr.slfn_Groep // where ev.slfn_enquete.Id == enGuid // select vr).ToList(); IQueryable&lt;slfn_enquetevraag&gt; enquetevraaglist = (from ev in _oContext.slfn_enquetevraagSet orderby ev.slfn_volgorde where ev.slfn_enquete.Id == enGuid select ev); List&lt;slfn_vraag&gt; vraaglist = (from vr in _oContext.slfn_vraagSet join ev in enquetevraaglist on vr.Id equals ev.slfn_vraag.Id orderby vr.slfn_Groep select vr).ToList(); return vraaglist; } </code></pre> <p>The code compiles without errors, but when i run it, I get a NullReferenceException on the question query. does anyone have any ideas on how to fix this?</p> <p>edit: exception details from VS2012 as requested below.</p> <pre><code> System.NullReferenceException occurred HResult=-2147467261 Message=De objectverwijzing is niet op een exemplaar van een object ingesteld. Source=Microsoft.Xrm.Sdk StackTrace: bij Microsoft.Xrm.Sdk.Linq.QueryProvider.TranslateJoin(QueryExpression qe, IList`1 methods, Int32&amp; i, Projection&amp; projection, List`1&amp; linkLookups) bij Microsoft.Xrm.Sdk.Linq.QueryProvider.GetQueryExpression(Expression expression, Boolean&amp; throwIfSequenceIsEmpty, Boolean&amp; throwIfSequenceNotSingle, Projection&amp; projection, NavigationSource&amp; source, List`1&amp; linkLookups) bij Microsoft.Xrm.Sdk.Linq.QueryProvider.Execute[TElement](Expression expression) bij Microsoft.Xrm.Sdk.Linq.QueryProvider.GetEnumerator[TElement](Expression expression) bij Microsoft.Xrm.Sdk.Linq.Query`1.GetEnumerator() bij System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) bij System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) bij Enquete_Webform.Data.EnqueteGenerator.GetVragenforEnquete(Guid enGuid) in e:\VS\tfs_products\MS CRM\2011\Enquete\Enquete_Webform\Enquete_Webform\Data\EnqueteGenerator.cs:regel 49 InnerException: </code></pre>
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