ASP.NET MVC5网站开发之业务逻辑层的架构和基本功能(四)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.Entity;

namespace Ninesky.Core
{
 public class NineskyContext:DbContext
 {


  public NineskyContext():base("DefaultConnection")
  {
   Database.SetInitializer<NineskyContext>(new CreateDatabaseIfNotExists<NineskyContext>());
  }
 }
}

using System.Runtime.Remoting.Messaging;

namespace Ninesky.Core
{
 /// <summary>
 /// 数据上下文工厂
 /// </summary>
 public class ContextFactory
 {
  /// <summary>
  /// 获取当前线程的数据上下文
  /// </summary>
  /// <returns>数据上下文</returns>
  public static NineskyContext CurrentContext()
  {
   NineskyContext _nContext = CallContext.GetData("NineskyContext") as NineskyContext;
   if (_nContext == null)
   {
    _nContext = new NineskyContext();
    CallContext.SetData("NineskyContext", _nContext);
   }
   return _nContext;
  }
 }
}

namespace Ninesky.Core.Types
{
 /// <summary>
 /// 
 /// </summary>
 public class Response
 {
  /// <summary>
  /// 返回代码. 0-失败，1-成功，其他-具体见方法返回值说明
  /// </summary>
  public int Code { get; set; }

  /// <summary>
  /// 返回消息
  /// </summary>
  public string Message { get; set; }

  /// <summary>
  /// 返回数据
  /// </summary>
  public dynamic Data { get; set; }

  public Response()
  {
   Code = 0;
  }
 }
}

using System.Collections.Generic;

namespace Ninesky.Core.Types
{
 public class Paging<T>
 {
  /// <summary>
  /// 当前页。从1计数
  /// </summary>
  public int PageIndex { get; set; }

  /// <summary>
  /// 每页记录数。默认20
  /// </summary>
  public int PageSize { get; set; }

  /// <summary>
  /// 总记录数
  /// </summary>
  public int TotalNumber;/// <summary>
  /// 当前页记录列表
  /// </summary>
  public List<T> Items { get; set; }
  
  public Paging()
  {
   PageIndex = 1;
   PageSize = 20;
  }
 }
}

using Ninesky.Core.Types;
using Ninesky.DataLibrary;
using System.Data.Entity;
using System.Linq;

namespace Ninesky.Core
{
 /// <summary>
 /// 管理类的基类
 /// </summary>
 /// <typeparam name="T">模型类</typeparam>
 public abstract class BaseManager<T> where T :class
 {
  /// <summary>
  /// 数据仓储类
  /// </summary>
  protected Repository<T> Repository;

  /// <summary>
  /// 默认构造函数
  /// </summary>
  public BaseManager():this(ContextFactory.CurrentContext())
  {
  }
  /// <summary>
  /// 构造函数
  /// </summary>
  /// <param name="dbContext">数据上下文</param>
  public BaseManager(DbContext dbContext){
   Repository = new Repository<T>(dbContext);
  }

  /// <summary>
  /// 添加
  /// </summary>
  /// <param name="entity">实体数据</param>
  /// <returns>成功时属性【Data】为添加后的数据实体</returns>
  public virtual Response Add(T entity)
  {
   Response _response = new Response();
   if(Repository.Add(entity)>0)
   {
    _response.Code = 1;
    _response.Message = "添加数据成功！";
    _response.Data = entity;
   }
   else
   {
    _response.Code = 0;
    _response.Message = "添加数据失败！";
   }

   return _response;
  }

  /// <summary>
  /// 更新
  /// </summary>
  /// <param name="entity">实体数据</param>
  /// <returns>成功时属性【Data】为更新后的数据实体</returns>
  public virtual Response Update(T entity)
  {
   Response _response = new Response();
   if (Repository.Update(entity) > 0)
   {
    _response.Code = 1;
    _response.Message = "更新数据成功！";
    _response.Data = entity;
   }
   else
   {
    _response.Code = 0;
    _response.Message = "更新数据失败！";
   }

   return _response;
  }


  /// <summary>
  /// 删除
  /// </summary>
  /// <param name="ID">主键</param>
  /// <returns>Code：0-删除失败；1-删除陈功；10-记录不存在</returns>
  public virtual Response Delete(int ID)
  {
   Response _response = new Response();
   var _entity = Find(ID);
   if (_entity == null)
   {
    _response.Code = 10;
    _response.Message = "记录不存在！";
   }
   else
   {
    if (Repository.Delete(_entity) > 0)
    {
     _response.Code = 1;
     _response.Message = "删除数据成功！";
    }
    else
    {
     _response.Code = 0;
     _response.Message = "删除数据失败！";
    }
   }
   

   return _response;
  }

  /// <summary>
  /// 查找实体
  /// </summary>
  /// <param name="ID">主键</param>
  /// <returns>实体</returns>
  public virtual T Find(int ID)
  {
   return Repository.Find(ID);
  }

  /// <summary>
  /// 查找数据列表-【所有数据】
  /// </summary>
  /// <returns>所有数据</returns>
  public IQueryable<T> FindList()
  {
   return Repository.FindList();
  }

  /// <summary>
  /// 查找分页数据
  /// </summary>
  /// <param name="paging">分页数据</param>
  /// <returns>分页数据</returns>
  public Paging<T> FindPageList(Paging<T> paging)
  {
   paging.Items = Repository.FindPageList(paging.PageSize, paging.PageIndex, out paging.TotalNumber).ToList();
   return paging;
  }

  /// <summary>
  /// 总记录数
  /// </summary>
  /// <returns>总记录数</returns>
  public virtual int Count()
  {
   return Repository.Count();
  }
 }
}