MVC ---- EF三层代码

1、DAL层

using Night.Models;
using System;
using System.Collections.Generic;
using System.Data.Entity.Infrastructure;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;

namespace NightCat.DAL
{
    public class SysLogService
    {

        //public SysLogService()
        //{
        //    //删除使用
        //    DelByCondition(p => p.F_Id == "00003");

        //    //修改使用
        //    Sys_Log sl = new Sys_Log()
        //    {
        //        F_Id = "00003",
        //        F_Account = "adf",
        //        F_CreatorTime = DateTime.Now
        //    };
        //    this.Modify(sl, "F_Account", "F_CreatorTime");//或
        //    this.Modify(sl, new string[] { "F_Account", "F_CreatorTime" });

        //    //排序
        //    List<Sys_Log> ssl = this.GetListByCondition(p => p.F_Id == "00003" && p.F_Account == "1000");
        //    List<Sys_Log> ssl2 = this.GetListByCondition(p => p.F_Id == "00003" && p.F_Account == "1000", p2 => p2.F_Id);

        //}

        /// <summary>
        /// EF数据上下文
        /// </summary>
        NightCatEntities nc = new NightCatEntities();

        #region 新增实体
        /// <summary>
        /// 新增实体
        /// </summary>
        /// <param name="log"></param>
        /// <returns></returns>
        public int Add(Sys_Log log)
        {
            try
            {
                nc.Sys_Log.Add(log);
                //保存成功之后，会将自增的ID和新增的行数设置给log
                return nc.SaveChanges();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 根据ID删除一条数据
        /// <summary>
        /// 根据ID删除一条数据
        /// </summary>
        /// <param name="Id"></param>
        /// <returns></returns>
        public int DelById(string Id)
        {
            try
            {
                //创建对象
                Sys_Log sl = new Sys_Log()
                {
                    F_Id = Id
                };
                //把要删除的对象添加到集合中
                nc.Sys_Log.Attach(sl);
                nc.Sys_Log.Remove(sl);
                return nc.SaveChanges();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 根据条件删除数据
        /// <summary>
        /// 根据条件删除数据
        /// </summary>
        /// <param name="delWhere">返回值为bool类型的委托对象(方法)</param>
        /// <returns></returns>
        public int DelByCondition(Expression<Func<Sys_Log, bool>> delWhere)
        {
            try
            {
                //查询
                List<Sys_Log> pDels = nc.Sys_Log.Where(delWhere).ToList();
                pDels.ForEach(p => nc.Sys_Log.Remove(p));
                return nc.SaveChanges();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 修改+Modify(Sys_Log p, params string[] proNames)
        /// <summary>
        /// 修改数据
        /// </summary>
        /// <param name="p">要修改的对象</param>
        /// <param name="proName">要修改的属性名称集合</param>
        /// params 可变参数
        /// <returns></returns>
        public int Modify(Sys_Log p, params string[] proNames)
        {
            try
            {
                DbEntityEntry entry = nc.Entry<Sys_Log>(p);
                entry.State = System.Data.Entity.EntityState.Unchanged;

                foreach (string proName in proNames)
                {
                    entry.Property(proName).IsModified = true;
                }
                return nc.SaveChanges();
            }
            catch (Exception)
            {

                throw;
            }
        }
        #endregion

        #region 根据条件检索集合中的数据 List<Sys_Log> GetListByCondition(Expression<Func<Sys_Log, bool>> whereLambda)
        /// <summary>
        /// 根据条件检索集合中的数据
        /// </summary>
        /// <param name="whereLambda"></param>
        /// <returns></returns>
        public List<Sys_Log> GetListByCondition(Expression<Func<Sys_Log, bool>> whereLambda)
        {
            try
            {
                return nc.Sys_Log.Where(whereLambda).ToList();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region + 根据条件检索集合中的数据并进行排序+GetListByCondition<Tkey>(Expression<Func<Sys_Log, bool>> whereLambda,Expression<Func<Sys_Log,Tkey>> orderLamba)
        /// <summary>
        /// 根据条件检索集合中的数据并进行排序+GetListByCondition<Tkey>(Expression<Func<Sys_Log, bool>> whereLambda,Expression<Func<Sys_Log,Tkey>> orderLamba)
        /// </summary>
        /// <param name="whereLambda"></param>
        /// <returns></returns>
        /// 这么的Tkey不是必要的使用的时候可以不写
        public List<Sys_Log> GetListByCondition<Tkey>(Expression<Func<Sys_Log, bool>> whereLambda,Expression<Func<Sys_Log,Tkey>> orderLamba)
        {
            try
            {
                return nc.Sys_Log.Where(whereLambda).OrderBy(orderLamba).ToList();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 根据条件和排序查询一分页的形式展示
        /// <summary>
        /// 根据条件和排序查询一分页的形式展示
        /// </summary>
        /// <typeparam name="Tkey">排序字段类型</typeparam>
        /// <param name="pageIndex">查询的页面</param>
        /// <param name="pageSize">每页显示的条数</param>
        /// <param name="orderLambda">排序的字段</param>
        /// <param name="whereLambda">查询的条件</param>
        /// <returns></returns>
        public List<Sys_Log> GetPageList<Tkey>(int pageIndex, int pageSize, Expression<Func<Sys_Log, Tkey>> orderLambda, Expression<Func<Sys_Log, bool>> whereLambda)
        {
            try
            {
                return nc.Sys_Log.Where(whereLambda).OrderBy(orderLambda).Skip((pageIndex - ) * pageSize).Take(pageSize).ToList();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 批量修改+Modify(Sys_Log p, params string[] proNames)
        /// <summary>
        /// 批量修改数据
        /// </summary>
        /// <param name="model">要修改的列及修改后列的值的集合</param>
        /// params 可变参数
        /// <returns></returns>
        public int Modifys(Sys_Log model,Expression<Func<Sys_Log,bool>> whereLambda,params string[] ModifyProNames)
        {
            try
            {
                //1、查询出要修改的数据
                List<Sys_Log> listModif = nc.Sys_Log.Where(whereLambda).ToList();

                //2、获取实体类对象
                Type t = typeof(Sys_Log);
                //3、获取实体类所有的共有属性
                List<Sys_Log> proInfos = t.GetProperties(BindingFlags.Instance | BindingFlags.Public).ToList();
                //4、创建一个实体属性字典集合
                Dictionary<string, PropertyInfo> dictPros = new Dictionary<string, PropertyInfo>();
                //5、将实体属性中要修改的属性，添加到字典集合中，键：属性名，值：属性对象
                proInfos.ForEach(p =>
                {
                    if (ModifyProNames.Contains(p.F_NickName))
                    {
                        dictPros.Add(p.F_NickName, p);
                    }
                });
                //循环要修改的属性名
                foreach (string proName in ModifyProNames)
                {
                    //判断要修改的属性名是否在实体类的属性集合中
                    if (dictPros.ContainsKey(proName))
                    {
                        //如何存在，则取出要修改的属性对象
                        PropertyInfo proInfo = dictPros[proName];
                        //取出要修改的值
                        object newValue = proInfo.GetValue(model, null);
                        //批量设置要修改的对象的属性
                        foreach (Sys_Log item in listModif)
                        {
                            //为要修改的对象的要修改的属性，设置新的值
                            proInfo.SetValue(item, newValue,null);
                        }

                    }
                }

             }
            catch (Exception)
            {

                throw;
            }
        }
        #endregion
    }
}

2、BLL层

using Night.Models;
using NightCat.DAL;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using NightCat.DAL;

namespace NightCat.BLL
{
    public class SysLogManager
    {
        SysLogService ss = new SysLogService(); 

        #region 新增实体
        /// <summary>
        /// 新增实体
        /// </summary>
        /// <param name="log"></param>
        /// <returns></returns>
        public int Add(Sys_Log log)
        {
            try
            {
              return  ss.Add(log);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 根据ID删除一条数据
        /// <summary>
        /// 根据ID删除一条数据
        /// </summary>
        /// <param name="Id"></param>
        /// <returns></returns>
        public int DelById(string Id)
        {
            try
            {
                return ss.DelById(Id);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 根据条件删除数据
        /// <summary>
        /// 根据条件删除数据
        /// </summary>
        /// <param name="delWhere">返回值为bool类型的委托对象(方法)</param>
        /// <returns></returns>
        public int DelByCondition(Expression<Func<Sys_Log, bool>> delWhere)
        {
            try
            {
                //查询
                return ss.DelByCondition(delWhere);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 修改+Modify(Sys_Log p, params string[] proNames)
        /// <summary>
        /// 修改数据
        /// </summary>
        /// <param name="p">要修改的对象</param>
        /// <param name="proName">要修改的属性名称集合</param>
        /// params 可变参数
        /// <returns></returns>
        public int Modify(Sys_Log p, params string[] proNames)
        {
            try
            {
                return ss.Modify(p, proNames);
            }
            catch (Exception)
            {

                throw;
            }
        }
        #endregion

        #region 根据条件检索集合中的数据 List<Sys_Log> GetListByCondition(Expression<Func<Sys_Log, bool>> whereLambda)
        /// <summary>
        /// 根据条件检索集合中的数据
        /// </summary>
        /// <param name="whereLambda"></param>
        /// <returns></returns>
        public List<Sys_Log> GetListByCondition(Expression<Func<Sys_Log, bool>> whereLambda)
        {
            try
            {
                return ss.GetListByCondition(whereLambda);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region + 根据条件检索集合中的数据并进行排序+GetListByCondition<Tkey>(Expression<Func<Sys_Log, bool>> whereLambda,Expression<Func<Sys_Log,Tkey>> orderLamba)
        /// <summary>
        /// 根据条件检索集合中的数据并进行排序+GetListByCondition<Tkey>(Expression<Func<Sys_Log, bool>> whereLambda,Expression<Func<Sys_Log,Tkey>> orderLamba)
        /// </summary>
        /// <param name="whereLambda"></param>
        /// <returns></returns>
        /// 这么的Tkey不是必要的使用的时候可以不写
        public List<Sys_Log> GetListByCondition<Tkey>(Expression<Func<Sys_Log, bool>> whereLambda, Expression<Func<Sys_Log, Tkey>> orderLamba)
        {
            try
            {
                return ss.GetListByCondition<Tkey>(whereLambda,orderLamba);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 根据条件和排序查询一分页的形式展示
        /// <summary>
        /// 根据条件和排序查询一分页的形式展示
        /// </summary>
        /// <typeparam name="Tkey">排序字段类型</typeparam>
        /// <param name="pageIndex">查询的页面</param>
        /// <param name="pageSize">每页显示的条数</param>
        /// <param name="orderLambda">排序的字段</param>
        /// <param name="whereLambda">查询的条件</param>
        /// <returns></returns>
        public List<Sys_Log> GetPageList<Tkey>(int pageIndex, int pageSize, Expression<Func<Sys_Log, Tkey>> orderLambda, Expression<Func<Sys_Log, bool>> whereLambda)
        {
            try
            {
                return ss.GetPageList(pageIndex, pageSize, orderLambda, whereLambda);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion
    }
}

3、UI层

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="NightCatWeb.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="gvParas" runat="server">

        </asp:GridView>
    </div>
    </form>
</body>
</html>
---------------------------------------------------------------------
using Night.Models;
using NightCat.BLL;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace NightCatWeb
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {
                SysLogManager sm = new SysLogManager();
                List<Sys_Log> sl = sm.GetPageList(, , p => p.F_Id, p => p.F_IPAddress != "").ToList();
                this.gvParas.DataSource = sl;
                this.gvParas.DataBind();
            }
        }
    }
}