使用Autofac在ASP.NET Web API上实现依赖注入

在ASP.NET Web API里使用Autofac

1.通过NuGet安装Autofac.WebApi（当时安装的是Autofac 3.1.0）

PM > Install-Package Autofac.WebApi

2.在App_Start文件夹下新建AutofacWebApiConfig类

 public class AutofacWebApiConfig

    {

        public static void Run()

        {

            SetAutofacWebApi();

        }



        private static void SetAutofacWebApi()

        {

            ContainerBuilder builder = new ContainerBuilder();

            HttpConfiguration config = GlobalConfiguration.Configuration;

            // Register API controllers using assembly scanning.

            builder.RegisterApiControllers(Assembly.GetExecutingAssembly());

            builder.RegisterType<ValueService>().As<IValueService>()

                .InstancePerApiRequest();

            var container = builder.Build();

            // Set the WebApi dependency resolver.

            config.DependencyResolver = new AutofacWebApiDependencyResolver(container);

        }

3.在Global中添加以下代码

protected void Application_Start()

        {

            AreaRegistration.RegisterAllAreas();



            WebApiConfig.Register(GlobalConfiguration.Configuration);

            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

            RouteConfig.RegisterRoutes(RouteTable.Routes);

            BundleConfig.RegisterBundles(BundleTable.Bundles);

            //Call Autofac DI configurations  AutofacWebApiConfig.Run();

        }