namespace DALFactory

 {

     public  class DALHelper

     {

         public static IStuDAL AddStu()

         {

             //IStuDAL stu = new StudentDAL();

             //return stu;

             //这里应该动态创建类的实例

             string path = ConfigurationManager.AppSettings["IStuDAL"];   //得到StuDAL.StudentDAL

             string type = path.Split('.')[];    //得到StuDAL

             Assembly ab = Assembly.Load(type);

             return  (IStuDAL)ab.CreateInstance(path);

         }

         public static IStuDAL GetAllStudent()

         {

            string path=ConfigurationManager.AppSettings["IStuDAL"];

            string type = path.Split('.')[];

            Assembly ab = Assembly.Load(type);

            return (IStuDAL)ab.CreateInstance(path);

         }

     }

 }