Mvc Autofac构造器注入

新建MVC项目，添加程序集引用

定义接口ILog

 public interface ILog

    {

        string  Save(string message);

    }

类TxtLog实现接口ILog

public class TxtLog:ILog

    {

        public string  Save(string message)

        {

            return "TxtLog";

        }

    }

类DbLog实现接口ILog

  public class DbLog:ILog

    {

        public string Save(string message)

        {

            return "DbLog";

        }

    }

修改HomeController里面Index方法，改为如下，注意引用

     private ILog _log;

        //构造器注入

        public HomeController(ILog log)

        {

            _log = log;

        }

        // GET: /Home/

        public ActionResult Index()

        {

            ViewBag.Message = "Welcome to ASP.NET MVC!";

            ViewBag.LogTypeName = _log.Save("");

            return View();

        }

修改页面Index.cshtml ，添加如下代码

<!DOCTYPE html>

<html>

<head>

    <meta name="viewport" content="width=device-width" />

    <title>Index</title>

</head>

<body>

    <div>

        <h2>ILog's type name is @ViewBag.LogTypeName</h2>

    </div>

</body>

</html>

修改Global.asax，在Application_Start()方法里面添加如下代码，注意引用Autofac、Autofac.Integration.Mvc以及别的引用

 protected void Application_Start()

        {

            AreaRegistration.RegisterAllAreas();

            WebApiConfig.Register(GlobalConfiguration.Configuration);

            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

            RouteConfig.RegisterRoutes(RouteTable.Routes);

            BundleConfig.RegisterBundles(BundleTable.Bundles);

            //依赖注入

            ContainerBuilder builder = new ContainerBuilder();

            builder.RegisterType<TxtLog>().As<ILog>().InstancePerHttpRequest();

            builder.RegisterControllers(Assembly.GetExecutingAssembly());

            builder.RegisterAssemblyTypes(Assembly.GetExecutingAssembly()).AsImplementedInterfaces();

            var container = builder.Build();

            DependencyResolver.SetResolver(new AutofacDependencyResolver(container));

        }

注意： DependencyResolver.SetResolver(new AutofacDependencyResolver(container)); 这个必须放在builder.RegisterControllers(Assembly.GetExecutingAssembly());的后面，不然会出现错误：没有为该对象定义无参数的构造函数。

运行结果

巴特西

Mvc Autofac构造器注入

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