【MVC5】使用Autofac实现依赖注入

1.安装Autofac

在Package Manager Console执行如下命令:

Install-Package Autofac
Install-Package Autofac.Mvc5

2.追加Model（Models.Movie）

using System.Data.Entity;

namespace FirstDenpendencyInjection.Models

{

    public class Movie

    {

        public int Id { get; set; }

        public string Title { get; set; }

        public int ReleaseYear { get; set; }

        public int RunTime { get; set; }

    }

    public class MovieDb : DbContext

    {

        public DbSet<Movie> Movies { get; set; }

    }

}

3.追加Controller和View

右键Controllers目录，Add Controller；

4.追加Repository的接口和类

IMovieRepository（Repositories.Inaterface）

using FirstDenpendencyInjection.Models;

using System.Collections.Generic;

namespace FirstDenpendencyInjection.Repositories.Inaterface

{

    public interface IMovieRepository

    {

        List<Movie> GetMovies();

        Movie GetMovie(int id);

        int Insert(Movie movie);

        int Update(Movie movie);

        int Delete(int id);

    }

}

MovieRepository（Repositories）

using FirstDenpendencyInjection.Models;

using FirstDenpendencyInjection.Repositories.Inaterface;

using System.Collections.Generic;

using System.Data.Entity;

using System.Linq;

namespace FirstDenpendencyInjection.Repositories

{

    public class MovieRepository : IMovieRepository

    {

        private MovieDb db = new MovieDb();

        public int Delete(int id)

        {

            Movie movie = db.Movies.Find(id);

            db.Movies.Remove(movie);

            return db.SaveChanges();

        }

        public Movie GetMovie(int id)

        {

            return db.Movies.Find(id);

        }

        public List<Movie> GetMovies()

        {

            return db.Movies.ToList();

        }

        public int Insert(Movie movie)

        {

            db.Movies.Add(movie);

            return db.SaveChanges();

        }

        public int Update(Movie movie)

        {

            db.Entry(movie).State = EntityState.Modified;

            return db.SaveChanges();

        }

    }

}

5.修改MoviesController类

using FirstDenpendencyInjection.Models;

using FirstDenpendencyInjection.Repositories.Inaterface;

using System.Net;

using System.Web.Mvc;

namespace FirstDenpendencyInjection.Controllers

{

    public class MoviesController : Controller

    {

        //private MovieDb db = new MovieDb();

        private IMovieRepository _repository;

        public MoviesController(IMovieRepository repo) {

            _repository = repo;

        }

        // GET: Movies

        public ActionResult Index()

        {

            return View(_repository.GetMovies());

        }

        // GET: Movies/Details/5

        public ActionResult Details(int? id)

        {

            if (id == null)

            {

                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

            }

            Movie movie = _repository.GetMovie(id.Value);

            if (movie == null)

            {

                return HttpNotFound();

            }

            return View(movie);

        }

        // GET: Movies/Create

        public ActionResult Create()

        {

            return View();

        }

        // POST: Movies/Create

        // To protect from overposting attacks, please enable the specific properties you want to bind to, for

        // more details see http://go.microsoft.com/fwlink/?LinkId=317598.

        [HttpPost]

        [ValidateAntiForgeryToken]

        public ActionResult Create([Bind(Include = "Id,Title,ReleaseYear,RunTime")] Movie movie)

        {

            if (ModelState.IsValid)

            {

                _repository.Insert(movie);

                //db.Movies.Add(movie);

                //db.SaveChanges();

                return RedirectToAction("Index");

            }

            return View(movie);

        }

        // GET: Movies/Edit/5

        public ActionResult Edit(int? id)

        {

            if (id == null)

            {

                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

            }

            Movie movie = _repository.GetMovie(id.Value);// db.Movies.Find(id);

            if (movie == null)

            {

                return HttpNotFound();

            }

            return View(movie);

        }

        // POST: Movies/Edit/5

        // To protect from overposting attacks, please enable the specific properties you want to bind to, for

        // more details see http://go.microsoft.com/fwlink/?LinkId=317598.

        [HttpPost]

        [ValidateAntiForgeryToken]

        public ActionResult Edit([Bind(Include = "Id,Title,ReleaseYear,RunTime")] Movie movie)

        {

            if (ModelState.IsValid)

            {

                _repository.Update(movie);

                //db.Entry(movie).State = EntityState.Modified;

                //db.SaveChanges();

                return RedirectToAction("Index");

            }

            return View(movie);

        }

        // GET: Movies/Delete/5

        public ActionResult Delete(int? id)

        {

            if (id == null)

            {

                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

            }

            Movie movie = _repository.GetMovie(id.Value);// db.Movies.Find(id);

            if (movie == null)

            {

                return HttpNotFound();

            }

            return View(movie);

        }

        // POST: Movies/Delete/5

        [HttpPost, ActionName("Delete")]

        [ValidateAntiForgeryToken]

        public ActionResult DeleteConfirmed(int id)

        {

            _repository.Delete(id);

            //Movie movie = db.Movies.Find(id);

            //db.Movies.Remove(movie);

            //db.SaveChanges();

            return RedirectToAction("Index");

        }

        protected override void Dispose(bool disposing)

        {

            //if (disposing)

            //{

            //    db.Dispose();

            //}

            base.Dispose(disposing);

        }

    }

}

6.注册组件(Global.asax)

using Autofac;

using Autofac.Integration.Mvc;

using FirstDenpendencyInjection.Controllers;

using System.Linq;

using System.Reflection;

using System.Web.Mvc;

using System.Web.Optimization;

using System.Web.Routing;

namespace FirstDenpendencyInjection

{

    public class MvcApplication : System.Web.HttpApplication

    {

        protected void Application_Start()

        {

            AreaRegistration.RegisterAllAreas();

            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

            RouteConfig.RegisterRoutes(RouteTable.Routes);

            BundleConfig.RegisterBundles(BundleTable.Bundles);

            // 注册组件

            var assembly = Assembly.GetExecutingAssembly();

            var builder = new ContainerBuilder();

            // 注册单个实例

            //builder.RegisterInstance(new MovieRepository()).As<IMovieRepository>();

            builder.RegisterType<MoviesController>();

            // 扫描assembly中的组件（类名以Repository结尾）

            builder.RegisterAssemblyTypes(assembly)

                   .Where(t => t.Name.EndsWith("Repository"))

                   .AsImplementedInterfaces();

            IContainer container = builder.Build();

            DependencyResolver.SetResolver(new AutofacDependencyResolver(container));

        }

    }

}