通用的BLL層及DAL層基類

小整的一個通用的BLL層及DAL層基類，可能寫得很差，作爲代碼收集，多多指教

 DAL 的接口

public interface IDAL<TEntity>
    {
        /// <summary>
        /// 增長
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        bool Add(TEntity item);

        /// <summary>
        /// 修改
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        bool Update(TEntity item);

        /// <summary>
        /// 刪除
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        bool Delete(TEntity item);

        /// <summary>
        /// 刪除
        /// </summary>
        /// <param name="objId"></param>
        /// <returns></returns>
        bool Delete(object objId);

        /// <summary>
        /// 獲取實體類
        /// </summary>
        /// <param name="objId"></param>
        /// <returns></returns>
        TEntity GetEntity(object objId);

        /// <summary>
        /// 獲取全部實體集合
        /// </summary>
        /// <returns></returns>
        IList<TEntity> GetData();

        /// <summary>
        /// 根據條件子句獲取實體集合
        /// </summary>
        /// <param name="sqlSubWhere"></param>
        /// <returns></returns>
        IList<TEntity> GetData(string sqlSubWhere);
    }

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BLL的接口

public interface IBLL<TEntity> where TEntity:class,new()
    {
        /// <summary>
        /// 增長
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        bool Add(TEntity item);

        /// <summary>
        /// 修改
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        bool Update(TEntity item);

        /// <summary>
        /// 刪除
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        bool Delete(TEntity item);

        /// <summary>
        /// 刪除
        /// </summary>
        /// <param name="objId"></param>
        /// <returns></returns>
        bool Delete(object objId);

        /// <summary>
        /// 獲取實體類
        /// </summary>
        /// <param name="objId"></param>
        /// <returns></returns>
        TEntity GetEntity(object objId);

        /// <summary>
        /// 獲取全部實體集合
        /// </summary>
        /// <returns></returns>
        IList<TEntity> GetData();

        /// <summary>
        /// 根據條件子句獲取實體集合
        /// </summary>
        /// <param name="sqlSubWhere"></param>
        /// <returns></returns>
        IList<TEntity> GetData(string sqlSubWhere);
    }

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DAL，通用基類

    /// <summary>
    /// 數據訪問層的基類
    /// </summary>
    /// <typeparam name="TEntity">實體例</typeparam>
    public abstract class BaseDAL<TEntity> : IDAL<TEntity>
    {
        public IDbHelp dbHelp { get; set; }

        /// <summary>
        /// 增長對象
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        public abstract bool Add(TEntity item);

        /// <summary>
        /// 修改對象
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        public abstract bool Update(TEntity item);
        
        /// <summary>
        /// 刪除對象
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        public abstract bool Delete(TEntity item);


        /// <summary>
        /// 刪除對象
        /// </summary>
        /// <param name="objId"></param>
        /// <returns></returns>
        public abstract bool Delete(object objId);

        /// <summary>
        /// 獲取單個實體
        /// </summary>
        /// <param name="objId"></param>
        /// <returns></returns>
        public abstract TEntity GetEntity(object objId);

        /// <summary>
        /// 獲取全部實體
        /// </summary>
        /// <returns></returns>
        public abstract IList<TEntity> GetData();

        /// <summary>
        /// 根據條件獲取實體
        /// </summary>
        /// <param name="sqlSubWhere"></param>
        /// <returns></returns>
        public abstract IList<TEntity> GetData(string sqlSubWhere);
    }

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BLL，通用基類

    /// <summary>
    /// 業務邏輯的基類對象
    /// </summary>
    /// <typeparam name="TDAL">數據訪問層</typeparam>
    /// <typeparam name="TEntity">實體類</typeparam>
    public class BaseBLL<TDAL, TEntity> : IBLL<TEntity> 
        where TDAL:BaseDAL<TEntity>,new()
        where TEntity:class,new()
    {
        protected IDbHelp db = null;
        protected TDAL dal;
        public BaseBLL(IDbHelp dbHelp)
        {
            db = dbHelp;
            dal = new TDAL();
            dal.dbHelp = dbHelp;
        }

        public bool Add(TEntity item)
        {
            return dal.Add(item);
        }
        public bool Update(TEntity item)
        {
            return dal.Update(item);
        }

        public bool Delete(TEntity item)
        {
            return dal.Delete(item);
        }

        public bool Delete(object objId)
        {
            return dal.Delete(objId);
        }

        public TEntity GetEntity(object objId)
        {
            return dal.GetEntity(objId);
        }

        public IList<TEntity> GetData()
        {
            return dal.GetData();
        }

        public IList<TEntity> GetData(string sqlSubWhere)
        {
            return dal.GetData(sqlSubWhere);
        }


       
    }

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調用代碼以下：

var bll = new BaseBLL<Cfg_Codes_DAL, Cfg_Codes_Entity>(dbHelp);