public void BindTopic() { DataClassesDataContext db = new DataClassesDataContext(); Exam exam = db.Exam.First(t => t.ExamId == decimal.Parse(examId)); theExamId = exam.TheExamId.ToString(); if (exam == null) { alert("获取试卷信息失败!", "AllExam.aspx"); } examName = examBll.GetExamName(exam); topics = examBll.GetPracTopicByExamId(ref pageNumber, ref totalPage, ref count, examId); }