Linq分组.include（“表”）在表上返回null

问题描述

我需要加载表AssessmentQuestionsReference，以便我可以绑定到我的WPF应用程序中。

   
 $ b $ <您的 .Include（AssessmentQuestions）将拉入 a.AssessmentQuestions ，但不是 a.AssessmentQuestions.AssessmentQuestionGroups 。
 
I have a linq query that is grouping by answers by QuestionGroup.

I need to have the table AssessmentQuestionsReference load so that i can bind to it in my WPF app.
   var groupedAnswers = from a in App.ents.AssessmentAnswers.Include("AssessmentQuestions")
                        where a.Organisations.OrganisationID == App.selectedOrganisation.OrganisationID
                        group a by a.AssessmentQuestions.AssessmentQuestionGroups.QuestionGroup into g
                        select new { Group = g.Key, Answer = g };
When i drill down into g, AssessmentQuestions is "null". I am not sure why as i thought it should have loaded it even without the include as i am going through that table to get the question groups.
Any ideas?
 解决方案 
Have you tried including AssessmentQuestions.AssessmentQuestionGroups?  
Your .Include("AssessmentQuestions") will pull in a.AssessmentQuestions, but not a.AssessmentQuestions.AssessmentQuestionGroups.
                        
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