MVC-CZBK.ItcastOA.BLL. BaseService

泛型基类BLL设计

最新推荐文章于 2019-04-19 17:15:47 发布

转载最新推荐文章于 2019-04-19 17:15:47 发布 · 117 阅读

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本文介绍了一个泛型基类BLL(BaseService<T>)的设计与实现，该基类提供了一系列通用的数据操作方法，如加载、分页、删除、更新和添加等。通过继承此基类并实现抽象方法SetCurrentDal，可以为具体业务逻辑层(BLL)快速搭建数据访问层(DAL)接口。

using CZBK.ItcastOA.DALFactory;
using CZBK.ItcastOA.IDAL;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CZBK.ItcastOA.BLL
{
public abstract class BaseService<T> where T:class,new()
{
public IDBSession CurrentDBSession
{
get
{
// return new DBSession();//暂时
return DBSessionFactory.CreateDBSession();
}
}
public IDAL.IBaseDal<T> CurrentDal { get; set; }
public abstract void SetCurrentDal(); //通过子类来指定dal
public BaseService()
{
SetCurrentDal();//子类一定要实现抽象方法。
}
public IQueryable<T> LoadEntities(System.Linq.Expressions.Expression<Func<T, bool>> whereLambda)
{

return CurrentDal.LoadEntities(whereLambda);
}

public IQueryable<T> LoadPageEntities<s>(int pageIndex, int pageSize, out int totalCount, System.Linq.Expressions.Expression<Func<T, bool>> whereLambda, System.Linq.Expressions.Expression<Func<T, s>> orderbyLambda, bool isAsc)
{
return CurrentDal.LoadPageEntities<s>(pageIndex, pageSize, out totalCount, whereLambda, orderbyLambda, isAsc);
}
/// <summary>
/// 删除
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool DeleteEntity(T entity)
{
CurrentDal.DeleteEntity(entity);
return CurrentDBSession.SaveChanges();
}
/// <summary>
/// 更新
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool EditEntity(T entity)
{
CurrentDal.EditEntity(entity);
return CurrentDBSession.SaveChanges();
}
/// <summary>
/// 添加数据
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public T AddEntity(T entity)
{
CurrentDal.AddEntity(entity);
CurrentDBSession.SaveChanges();
return entity;
}
}
}