WebAPI2使用AutoFac依赖注入完整解决方案。

WebApi2上进行依赖注入，在百度里能搜到的的完整解决方案的文章少之又少，缺胳膊断腿。

和MVC5依赖注入的不一样之处，而且须要注意的地方，标记在注释当中。上Global代码：

namespace S2S.WebApi
{
    public class WebApiApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {

            //----AutoFac  DI------
            var builder = new ContainerBuilder();
            SetupResolveRules(builder);
            builder.RegisterApiControllers(Assembly.GetExecutingAssembly());               //RegisterApiControllers方法
            var container = builder.Build();
            HttpConfiguration config = GlobalConfiguration.Configuration;//注意此处HttpConfiguration类的 config对象，必定不要new,要从GlobalConfiguration获取
            config.DependencyResolver = (new AutofacWebApiDependencyResolver(container));      //注意此处与MVC依赖注入不一样
            //---------------------------------------------------------
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);

            

            AreaRegistration.RegisterAllAreas();
            GlobalConfiguration.Configure(WebApiConfig.Register);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }

          /// <summary>
       ///  AutoFac
        /// </summary>
        /// <param name="builder"></param>
        private static void SetupResolveRules(ContainerBuilder builder)
        {

            var assembly = Assembly.Load("s2s.BLL");   //根据程序集名称加载程序集
            builder.RegisterAssemblyTypes(assembly).SingleInstance();//每次都返回同一个实例
            builder.RegisterAssemblyTypes(assembly).Where(t => t.Name.EndsWith("Service")).AsImplementedInterfaces();

        }
    }
}

　也没有太多须要解释的地方，Controller中仍是构造器注入。开发中已经亲测有效。　

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