我有2个清单
var listquestionold = db.tblExamQuetions.Where(p => p.QuetionExamId == oldexamid).ToList();
var listquestionnew = listquestionnew = db.tblExamQuetions.Where(p => p.QuetionExamId == examid ).ToList();
List<tblExamQuestionAnswers> listanswers = new List<tblExamQuestionAnswers>();
我怎样才能得到答案,其中questionId为listquestionold:
listanswers =db.tblanswers.where(p=> p.ExamQuestionId exists in listquestionold？