【MVC5】使用Autofac实现依赖注入

1.安装Autofac

在Package Manager Console执行如下命令:

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));
}
}
}