Getting The specified entity is not contained in this EntitySet. error

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I am using silverlight mvvm light framework. when I was trying to delete entity I got The specified entity is not contained in this EntitySet. error but in my Database that entity is already there.
In this code I am getting error.

This is my code where I am doing delete operation

C#

public void DeleteSectionQuestion(Form currentForm,CustomSectionTree selectedSectionQuestion, DeleteDelegate callback)
   {
       FormSection fs = new FormSection();

       foreach (Question q in selectedSectionQuestion.Questions)
       {
           fs.FormID = currentForm.FormID;
           fs.SectionID = selectedSectionQuestion.SectionID;
           fs.QuestionID = q.QuestionID;
           context.FormSections.Remove(fs);
       }

       SubmitOperation so = context.SubmitChanges();
       so.Completed += (s, args) =>
       {
           if (so.HasError)
           {
               so.MarkErrorAsHandled();
               callback.Invoke(false, so.Error);
           }
           else
               callback.Invoke(true, null);
       };
   }

Posted 23-Feb-12 23:33pm

Radhika Khacharia

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Dean Oliver · Accepted Answer · 2012-02-26T19:04:00

This is because you are creating a new instance of your form section object. The data context is unaware of this object and cannot track it. You need to Attach the object to the context before you use the context features.
eg;

C#

context.Attach(fs);

That being said why don't you rather alter your code to delete by Id rather than create an instance of form section and assign values to it. Your approach just seems unnecessary.

Eg;

C#

public void DeleteSectionQuestion(Form currentForm,CustomSectionTree selectedSectionQuestion, DeleteDelegate callback)
   {
       foreach (Question q in selectedSectionQuestion.Questions)
       {
           context.FormSections.Remove(context.FormSections.FirstOrDefault(x => x.FormID == currentForm.FormID));
       }

       SubmitOperation so = context.SubmitChanges();
       so.Completed += (s, args) =>
       {
           if (so.HasError)
           {
               so.MarkErrorAsHandled();
               callback.Invoke(false, so.Error);
           }
           else
               callback.Invoke(true, null);
       };
   }

Radhika Khacharia · Accepted Answer · 2012-02-26T23:56:00

C#

FormSection formSection= context.FormSections.Where(c => c.FormID == currentForm.FormID && c.SectionID == selectedSectionQuestion.SectionID && selectedSectionQuestion.Questions.Any(q=>q.QuestionID==c.QuestionID)).FirstOrDefault();
           context.FormSections.Remove(formSection);
           SubmitOperation so = context.SubmitChanges();
           so.Completed += (ss, argss) =>
           {
               if (so.HasError)
               {
                   so.MarkErrorAsHandled();
                   callback.Invoke(false, so.Error);
               }
               else
                   callback.Invoke(true, null);
           };

Getting The specified entity is not contained in this EntitySet. error

2 solutions

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