subjectservice.cs

本在线考试系统采用了面向对象的分析和设计

using System;
using System.Collections.Generic;
using System.Text;
using ExaminationSystem.BLL.DataInterface;
using ExaminationSystem.BLL.Domain;
using ExaminationSystem.BLLException;

namespace ExaminationSystem.BLL.Service
{
    public class SubjectService : AbstractService<Subject, ISubjectDao>
    {
        public override void DeleteById(long id)
        {  
            Subject obj = Dao.GetById(id, true);
            if (obj.Chapters.Count > 0)
            {
               DeleteException ex=new DeleteException("删除科目" + obj.Name + "失败！请确保该科目没有章节！");
                throw ex;
            }
   
            Dao.Delete(obj);
            Dao.CommitChanges();
    
        }
    }
}