OWIN中间件似乎不起作用

Question

I've recently started learning how to use Owin specification. I've added Owin packages, which are listed below to Web API 2 project. I've commented out the usage of WebApiConfig, and moved routes config and Elmah Logger to Startup class as you can see below -

Startup.cs - [assembly: OwinStartup("DataServicesStartup", typeof (Startup))]
public partial class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.UseCors(CorsOptions.AllowAll); 
            var config = new HttpConfiguration();                               
            config.Routes.MapHttpRoute("DefaultApi", "api/{controller}/{id}", new {id = RouteParameter.Optional});
            config.Services.Add(typeof (IExceptionLogger), new ElmahExceptionLogger());
            ConfigureAuth(app);
            JwtConfig.ConfigureOAuth(app);
            app.UseWebApi(config);
        }

Commented out WebApiConfig usage -

 protected void Application_Start()
            {
                WebLocatorIoC.RegisterServices();

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

However, when I'm trying to go to specified routes nothing happens. For example when I try to make a request to Controllers/ValuesController I use localhost:1111/api/values. Also Owin.Cors doesn't seem to work too. Only when I use routing and Cors in WebApiConfig it works, in this case WebApi.Cors.

I have the following Owin packages installed:

Microsoft.AspNet.Identity.Owin                                                                                                                 
Microsoft.AspNet.WebApi.Owin                                            
Microsoft.Owin                                                                  
Microsoft.Owin.Cors.                                                               
Microsoft.Owin.Diagnostics                                                                                      
Microsoft.Owin.Host.HttpListener                        
Microsoft.Owin.Host.SystemWeb                                                                   
Microsoft.Owin.Hosting                                                                               
Microsoft.Owin.Security                                                                                  
Microsoft.Owin.Security.Cookies                                         
Microsoft.Owin.Security.Facebook                                                                      
Microsoft.Owin.Security.Google                                                                             
Microsoft.Owin.Security.Jwt                                                                                   
Microsoft.Owin.Security.Microsoft                                                                     
Microsoft.Owin.Security.OAuth                                                                     
Microsoft.Owin.Security.Twitter                                                                        
Microsoft.Owin.SelfHost                                                                                            
Ninject.Web.Common.OwinHost                                                                                                        
Ninject.Web.WebApi.OwinHost                                                                                         
Owin      

So, could someone please give me a hint about what I'm doing wrong.

public class ValuesController : ApiController
    {
        // GET api/values
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "value2" };
        }
        //Other action methods were omitted 
    }             

Updates: added OWIN Startup Attribute.

Answer 1

I think you are missing at least one NuGet package. You probably need Microsoft.AspNet.WebApi.Core and you might want Microsoft.AspNet.WebApi.Client to handle content negotiation.