比较多层架构查询功能的泛型接口（IList）和普通（dataset）实现

 

	泛型接口	普通
表现层	string strWhere = "1=1 order by ID desc";         InfoMgr mgr = new InfoMgr(new InfoEntity());         IList<ViewInfoEntity> result = mgr.GetViewInfoSelf(strWhere);         SmartGridView1.DataSource = result;         SmartGridView1.DataBind();	BLL.TblNewsClassMgr classmgr = new BLL.TblNewsClassMgr();         DataSet ds = classmgr.GetAll();           GridView1.DataSource = ds.Tables[0].DefaultView;         GridView1.DataBind();
业务层	public IList<ViewInfoEntity> GetViewInfoSelf(string strWhere)         {             ViewInfoService service = new ViewInfoService(new ViewInfoEntity());             return service.SelectViewInfo(strWhere);         }	public DataSet GetAll()         {             return du.GetAll();         }
数据层	/// <summary>         /// 自定义检索         /// </summary>         /// <returns></returns>         public IList<ViewInfoEntity> SelectViewInfo(string whereSqlString)         {                       IList<ViewInfoEntity> result=new List<ViewInfoEntity>();             DAOBase dao = new ViewInfoDAO(entity);             dao.WhereSQLString=whereSqlString;               DataSet ret=dao.Select();               if (ret != null)             {                 if (ret.Tables[0].Rows.Count > 0)                 {                     foreach(DataRow row in ret.Tables[0].Rows)                     {                         ViewInfoEntity _entity = new ViewInfoEntity();                             if(row["ID"]!=null)                             {                             _entity.ID=int.Parse(row["ID"].ToString());                             }                             _entity.ValidDate=System.DateTime.Parse(row["ValidDate"].ToString());                             }                             }                         result.Add(_entity);                     }                 }             }             return result;         }	public DataSet GetAll()         {             StringBuilder sql = new StringBuilder();             sql.Append("select * from Users");               return SQLHelper.GetList(sql.ToString(), "user");         }
公共数据层	/// <summary>         /// 检索全部         /// </summary>         /// <returns></returns>         public DataSet Select()         {             DataSet result = null;             try             {                 result = SelectData();             }             catch (HuaSi.ExceptionProcessor.CustomDAOException ex)             {                 bool rethrow = ExceptionPolicy.HandleException(ex, "DBOperatePolicy");                 if (rethrow)                 {                     throw;                 }               }             return result;         }	/// <summary>         /// 执行一个T-SQL查询，返回DataSet对象         /// </summary>         /// <param name="query">查询的SQL语句</param>         /// <param name="TableName">DataSet结果中的表名</param>         /// <returns></returns>         public static DataSet GetList(string query, string TableName)         {             InitConn();             SqlDataAdapter sda = new SqlDataAdapter(query, conn);             DataSet ds = new DataSet();             sda.Fill(ds, TableName);             CloseConn();             return ds;         }
	private DataSet SelectData()         {             DataSet result = null;             IDataAccessState state = new SelectState(this.tableName, this);             result = (DataSet)state.Execute();             return result;           }