1

前言

上一篇《一步一步创建ASP.NET MVC5程序[Repository+Autofac+Automapper+SqlSugar](三)》,我们完成了:

* 引用SqlSugar
* 使用SqlSugar对Repository类的改造

并成功使用PostRepository来查询到了数据,今天我们来创建一个新的服务层以及安装配置依赖注入框架组件Autofac等。

本篇知识要点

* 创建服务层:TsBlog.Services
* 创建服务接口
* 实现服务接口
* 创建仓储接口
* 安装Autofac依赖注入组件
* 注册配置Autofac 依赖注入

教程内容

创建服务层

选中解决方案中的解决方案文件夹[1.Libraries],右键单击=>>添加=>>新项目,在弹出的对话框中添加一个.NET Framework 4.6.2的C#类库项目,命名为:TsBlog.Services。项目创建成功后,删除自动生成的Class1.cs文件。

由于服务层需要依赖于仓储层,所以首先切换到仓储层[TsBlog.Repositories]项目中,创建博文的仓储接口类:IPostRepository,代码如下:

using System.Collections.Generic;
using TsBlog.Domain.Entities;

namespace TsBlog.Repositories
{
    public interface IPostRepository
    {
        /// <summary>
        /// 根据ID查询单条数据
        /// </summary>
        /// <param name="id">ID</param>
        /// <returns></returns>
        Post FindById(int id);
        /// <summary>
        /// 查询所有数据(无分页,大数量时请慎用)
        /// </summary>
        /// <returns></returns>
        IEnumerable<Post> FindAll();

        /// <summary>
        /// 写入实体数据
        /// </summary>
        /// <param name="entity">博文实体类</param>
        /// <returns></returns>
        int Insert(Post entity);

        /// <summary>
        /// 更新实体数据
        /// </summary>
        /// <param name="entity">博文实体类</param>
        /// <returns></returns>
        bool Update(Post entity);

        /// <summary>
        /// 根据实体删除一条数据
        /// </summary>
        /// <param name="entity">博文实体类</param>
        /// <returns></returns>
        bool Delete(Post entity);

        /// <summary>
        /// 删除指定ID的数据
        /// </summary>
        /// <param name="id">主键ID</param>
        /// <returns></returns>
        bool DeleteById(object id);

        /// <summary>
        /// 删除指定ID集合的数据(批量删除)
        /// </summary>
        /// <param name="ids">主键ID集合</param>
        /// <returns></returns>
        bool DeleteByIds(object[] ids);
    }
}

再切换到服务层,在刚才创建的服务层项目中首先引用仓储层,并分别创建以下服务接口和类文件:

IPostService.cs:

using System.Collections.Generic;
using TsBlog.Domain.Entities;

namespace TsBlog.Services
{
    public interface IPostService
    {
        /// <summary>
        /// 根据ID查询单条数据
        /// </summary>
        /// <param name="id">ID</param>
        /// <returns></returns>
        Post FindById(int id);
        /// <summary>
        /// 查询所有数据(无分页,大数量时请慎用)
        /// </summary>
        /// <returns></returns>
        IEnumerable<Post> FindAll();

        /// <summary>
        /// 写入实体数据
        /// </summary>
        /// <param name="entity">博文实体类</param>
        /// <returns></returns>
        int Insert(Post entity);

        /// <summary>
        /// 更新实体数据
        /// </summary>
        /// <param name="entity">博文实体类</param>
        /// <returns></returns>
        bool Update(Post entity);

        /// <summary>
        /// 根据实体删除一条数据
        /// </summary>
        /// <param name="entity">博文实体类</param>
        /// <returns></returns>
        bool Delete(Post entity);

        /// <summary>
        /// 删除指定ID的数据
        /// </summary>
        /// <param name="id">主键ID</param>
        /// <returns></returns>
        bool DeleteById(object id);

        /// <summary>
        /// 删除指定ID集合的数据(批量删除)
        /// </summary>
        /// <param name="ids">主键ID集合</param>
        /// <returns></returns>
        bool DeleteByIds(object[] ids);
    }
}

PostService.cs

using System.Collections.Generic;
using TsBlog.Domain.Entities;
using TsBlog.Repositories;

namespace TsBlog.Services
{
    public class PostService : IPostService
    {
        private readonly IPostRepository _postRepository;
        public PostService(IPostRepository postRepository)
        {
            _postRepository = postRepository;
        }
        public bool Delete(Post entity)
        {
            return _postRepository.Delete(entity);
        }

        public bool DeleteById(object id)
        {
            return _postRepository.DeleteById(id);
        }

        public bool DeleteByIds(object[] ids)
        {
            return _postRepository.DeleteByIds(ids);
        }

        public IEnumerable<Post> FindAll()
        {
            return _postRepository.FindAll();
        }

        public Post FindById(int id)
        {
            return _postRepository.FindById(id);
        }

        public int Insert(Post entity)
        {
            return _postRepository.Insert(entity);
        }

        public bool Update(Post entity)
        {
            return _postRepository.Update(entity);
        }
    }
}

最后,我们再切换到仓储层,在PostRepository文件中使用IPostRepository接口并使用SqlSugar实现该接口中的所有数据操作的方法,
PostRepository.cs

using System.Collections.Generic;
using TsBlog.Domain.Entities;

namespace TsBlog.Repositories
{
    /// <summary>
    /// POST表的数据库操作类
    /// </summary>
    public class PostRepository : IPostRepository
    {
        /// <summary>
        /// 根据ID查询
        /// </summary>
        /// <param name="id">Post ID</param>
        /// <returns></returns>
        public Post FindById(int id)
        {
            using (var db = DbFactory.GetSqlSugarClient())
            {
                var entity = db.Queryable<Post>().Single(x => x.Id == id);
                return entity;
            }
        }

        /// <summary>
        /// 查询所有数据(无分页,大数量时请慎用)
        /// </summary>
        /// <returns></returns>
        public IEnumerable<Post> FindAll()
        {
            #region SqlSugar读取方式
            using (var db = DbFactory.GetSqlSugarClient())
            {
                var list = db.Queryable<Post>().ToList();
                return list;
            }
            #endregion
        }


        /// <summary>
        /// 写入实体数据
        /// </summary>
        /// <param name="entity">博文实体类</param>
        /// <returns></returns>
        public int Insert(Post entity)
        {
            using (var db = DbFactory.GetSqlSugarClient())
            {
                var i = db.Insertable(entity).ExecuteReturnBigIdentity();
                //返回的i是long类型,这里你可以根据你的业务需要进行处理
                return (int)i;
            }
        }

        /// <summary>
        /// 更新实体数据
        /// </summary>
        /// <param name="entity">博文实体类</param>
        /// <returns></returns>
        public bool Update(Post entity)
        {
            using (var db = DbFactory.GetSqlSugarClient())
            {
                //这种方式会以主键为条件
                var i = db.Updateable(entity).ExecuteCommand();
                return i > 0;
            }
        }

        /// <summary>
        /// 根据实体删除一条数据
        /// </summary>
        /// <param name="entity">博文实体类</param>
        /// <returns></returns>
        public bool Delete(Post entity)
        {
            using (var db = DbFactory.GetSqlSugarClient())
            {
                var i = db.Deleteable(entity).ExecuteCommand();
                return i > 0;
            }
        }

        /// <summary>
        /// 删除指定ID的数据
        /// </summary>
        /// <param name="id">主键ID</param>
        /// <returns></returns>
        public bool DeleteById(object id)
        {
            using (var db = DbFactory.GetSqlSugarClient())
            {
                var i = db.Deleteable<Post>(id).ExecuteCommand();
                return i > 0;
            }
        }

        /// <summary>
        /// 删除指定ID集合的数据(批量删除)
        /// </summary>
        /// <param name="ids">主键ID集合</param>
        /// <returns></returns>
        public bool DeleteByIds(object[] ids)
        {
            using (var db = DbFactory.GetSqlSugarClient())
            {
                var i = db.Deleteable<Post>().In(ids).ExecuteCommand();
                return i > 0;
            }
        }
    }
}

到这里,我们的仓储和服务层准备工作就完成了,接下来安装依赖注入组件:Autofac

安装Autofac

选择解决方案夹[2.Persentation]中的Web项目[TsBlog.Frontend],在"引用"("References")上单击右键,调出Nuget程序包管理界面,搜索"autofac",如下:

Nuget程序包管理--安装Autofac

Autofac的当前版本为:v4.6.2

同时,再搜索"Autofac.Mvc5",如下:

Nuget程序包管理--安装Autofac.Mvc5

配置/注册依赖选项

Autofac安装完成之后,我们需要对依赖的接口对实现在Autofac中进行注册,本示例的Autofac配置在Global.asax文件中(请确保TsBlog.Frontend项目中引用了:TsBlog.Domain,TsBlog.Repositories,TsBlog.Servcies这本个项目),如下:

Global.asax

using Autofac;
using Autofac.Integration.Mvc;
using System.Web.Mvc;
using System.Web.Routing;
using TsBlog.Repositories;
using TsBlog.Services;

namespace TsBlog.Frontend
{
    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            //BundleConfig.RegisterBundles(BundleTable.Bundles);

            AutofacRegister();
        }

        private void AutofacRegister()
        {
            var builder = new ContainerBuilder();

            //注册MvcApplication程序集中所有的控制器
            builder.RegisterControllers(typeof(MvcApplication).Assembly);

            //注册仓储层服务
            builder.RegisterType<PostRepository>().As<IPostRepository>();
            //注册服务层服务
            builder.RegisterType<PostService>().As<IPostService>();

            //注册过滤器
            builder.RegisterFilterProvider();

            var container = builder.Build();

            //设置依赖注入解析器
            DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
        }
    }
}

然后,我们修改控制器文件夹中的HomeController,修改后的代码如下:

HomeController.cs

using System.Web.Mvc;
using TsBlog.Services;

namespace TsBlog.Frontend.Controllers
{
    public class HomeController : Controller
    {
        private readonly IPostService _postService;
        public HomeController(IPostService postService)
        {
            _postService = postService;
        }
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult Post()
        {
            //var postRepository = new PostRepository();
            //var post = postRepository.FindById(1);
            //return View(post);

            var post = _postService.FindById(1);
            return View(post);
        }
    }
}

再次按F5运行,打开页面:http://localhost:54739/home/post,这次我们可以看到和前两篇一样的运行效果了:

Autofac运行结果

本文的源码托管地址:https://github.com/lampo1024/...

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