classservice.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 ClassService : AbstractService<Class, IClassDao> 
    {
        public override void DeleteById(long id)
        {
            Class cs = Dao.GetById(id,true);
            if (cs.Students.Count > 0)
                throw new  DeleteException("删除班级" + cs.Name + "失败！请确保该班级没有学生再删除！");
            Dao.Delete(cs);
            Dao.CommitChanges();
        }
    }
}