EF 通用数据层类

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
{
　　 /// <summary>
    /// MSSql 数据库 数据层 父类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class BaseDAL<T> where T : class,new()
    {
        /// <summary>
        /// EF 上下文对象
        /// </summary>
        DbContext db = new DBContextFactory().GetDbContext();