MVC4+EF：项目实战(一)

1.添加框架 

Model,DAL,IDAL,DALFactory,BLL,IBLL,Common,UI 层

2,在Model层中添加EF框架。保存，让实体映射到Model层。

3.搭设框架IDAL层的IUserInfoDal,公共的正删改查分页方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using CZBW.BookShop.Model;

namespace CZBW.BookShop.IDAL
{
    public interface IUserInfoDal
    {
        //查询数据库，传入参数是Lambda表达式
        IQueryable LoadEntities(System.Linq.Expressions.Expression>whereLambda );
        IQueryable LoadPageEntities(int pageIndex, int pageSize, out int totalCount,System.Linq.Expressions.Expression> orderByLambda,System.Linq.Expressions.Expression> whereLambda,bool isAsc);
        bool DeleteEntity(UserInfo entity);
        bool UpdateEntity(UserInfo entity);
        UserInfo AddEntity(UserInfo entity);
    }
}

将IUserInfoDal的内容替换为泛型，剪切到IBaseDal中，作为通用接口，同事IUserInfoDal继承IBaseDal

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using CZBW.BookShop.Model;

namespace CZBW.BookShop.IDAL
{
   public  interface IBaseDal where T:class,new()
    {
        //查询数据库，传入参数是Lambda表达式
        IQueryable LoadEntities(System.Linq.Expressions.Expression> whereLambda);
        IQueryable LoadPageEntities(int pageIndex, int pageSize, out int totalCount, System.Linq.Expressions.Expression> orderByLambda, System.Linq.Expressions.Expression> whereLambda, bool isAsc);
        bool DeleteEntity(T entity);
        bool UpdateEntity(T entity);
        T AddEntity(T entity);
    }
}

DAL层添加UserInfoDal实现IUserInfoDal

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NCUT.BookShop.IDAL;
using NCUT.BookShop.Model;
using System.Data;
namespace NCUT.BookShop.DAL
{
   public  class UserInfoDal:IUserInfoDal
    {
       NCUTBookShopDBEntities db = new NCUTBookShopDBEntities();
        public IQueryable LoadEntities(System.Linq.Expressions.Expression> whereLambda)
        {
            return db.UserInfo.Where(whereLambda);
        }

        public IQueryable LoadPageEntities(int pageIndex, int pageSize, out int totalCount, System.Linq.Expressions.Expression> orderByLambda, System.Linq.Expressions.Expression> whereLambda, bool isAsc)
        {
            var temp = db.UserInfo.Where(whereLambda);//过滤
            totalCount = temp.Count();
            if (isAsc)//升序
            {
                temp =
                    temp.OrderBy(orderByLambda)
                        .Skip((pageIndex - 1)*pageSize)
                        .Take(pageSize);
            }
            else
            {
                temp =
    temp.OrderByDescending(orderByLambda)
        .Skip((pageIndex - 1) * pageSize)
        .Take(pageSize);
            }
            return temp;
        }

        public bool DeleteEntity(Model.UserInfo entity)
        {
            db.Entry(entity).State = System.Data.Entity.EntityState.Deleted;

            return db.SaveChanges() > 0;
        }

        public bool UpdateEntity(Model.UserInfo entity)
        {
            db.Entry(entity).State = System.Data.Entity.EntityState.Modified;

            return db.SaveChanges() > 0;
        }

        public Model.UserInfo AddEntity(Model.UserInfo entity)
        {
            db.UserInfo.Add(entity);
            db.SaveChanges();
            return entity;
        }
    }
}

将UserInfoDal抽象为公共基类BaseDal,剪切

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NCUT.BookShop.Model;

namespace NCUT.BookShop.DAL
{
   public  class BaseDalwhere T:class ,new()
    {
        NCUTBookShopDBEntities db = new NCUTBookShopDBEntities();
        public IQueryable LoadEntities(System.Linq.Expressions.Expression> whereLambda)
        {
            return db.Set().Where(whereLambda);
        }

        public IQueryable LoadPageEntities(int pageIndex, int pageSize, out int totalCount, System.Linq.Expressions.Expression> orderByLambda, System.Linq.Expressions.Expression> whereLambda, bool isAsc)
        {
            var temp = db.Set().Where(whereLambda);//过滤
            totalCount = temp.Count();
            if (isAsc)//升序
            {
                temp =
                    temp.OrderBy(orderByLambda)
                        .Skip((pageIndex - 1) * pageSize)
                        .Take(pageSize);
            }
            else
            {
                temp =
    temp.OrderByDescending(orderByLambda)
        .Skip((pageIndex - 1) * pageSize)
        .Take(pageSize);
            }
            return temp;
        }

        public bool DeleteEntity(T entity)
        {
            db.Entry(entity).State = System.Data.Entity.EntityState.Deleted;

            return db.SaveChanges() > 0;
        }

        public bool UpdateEntity(T entity)
        {
            db.Entry(entity).State = System.Data.Entity.EntityState.Modified;

            return db.SaveChanges() > 0;
        }

        public T AddEntity(T entity)
        {
            db.Set().Add(entity);
            db.SaveChanges();
            return entity;
        }
    }
}

UserInfoDal继承BaseDal

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NCUT.BookShop.IDAL;
using NCUT.BookShop.Model;
using System.Data;
namespace NCUT.BookShop.DAL
{
   public  class UserInfoDal:BaseDal,IUserInfoDal
    {
    
    }
}