using System;using System.Collections.Generic;using System.Data;using System.Data.Entity;using System.Data.Entity.Infrastructure;using System.Linq;using System.Linq.Expressions;using System.Reflection;using System.Text;namespace DAL{　　 /// 
    /// MSSql 数据库 数据层 父类    /// 
    /// 
          public class BaseDAL
      
        where T : class,new()    {        /// 
       
        /// EF 上下文对象        /// 
        DbContext db = new DBContextFactory().GetDbContext();