/// <summary>
 /// 查看列表
 /// </summary>
 /// <returns></returns>
 public Student ShowStudentInfo(string stuNo)
 {
     try
     {
         string         sqlWhere = string.Format(" and  stuNo='{0}' ", stuNo);
         List <Student> list     = StudentAccess.Select(sqlWhere);
         if (list != null && list.Count == 1)
         {
             return(list[0]);
         }
         return(null);
     }
     catch (Exception ex)
     {
         return(null);
     }
 }
 /// <summary>
 /// 学生登录:输入账号密码,如果登录成功返回当前账号对象,否则返回NULL
 /// </summary>
 /// <param name="account"></param>
 /// <param name="password"></param>
 /// <returns></returns>
 public Student Login(string account, string password)
 {
     if (string.IsNullOrEmpty(account))
     {
         return(null);
     }
     try
     {
         string         sqlWhere = string.Format(" and stuNo ='{0}' and stuPwd='{1}'", account, password);
         List <Student> list     = StudentAccess.Select(sqlWhere);
         if (list != null && list.Count == 1)
         {
             return(list[0]);
         }
         return(null);
     }
     catch (Exception ex)
     {
         return(null);
     }
 }