CODEWITHSUNDEEP
asp.net-web-api2
user584018
user584018

Reputation: 11354

getting 404 for get api controller result after changing startup to OWIN

I start with Empty asp.net web api application with all default settings for VS 2017. I added one controller method with httpGet and result is fine.

Now I installed Microsoft.Owin.Host.SystemWeb and added a OWIN Startupclass.

[assembly: OwinStartup(typeof(WebApp1.Startup))]

namespace WebApp1
{
public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        var config = new HttpConfiguration();
        // Web API routes
        config.MapHttpAttributeRoutes();
        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }
}
}

After that I comment out global.asax code as I believe I don't need it,

protected void Application_Start()
    {
        //GlobalConfiguration.Configure(WebApiConfig.Register);
    }

Removing as well below code for Web API routes 

 //public static class WebApiConfig
//{
//    public static void Register(HttpConfiguration config)
//    {
//        // Web API configuration and services

//        // Web API routes
//        config.MapHttpAttributeRoutes();

//        config.Routes.MapHttpRoute(
//            name: "DefaultApi",
//            routeTemplate: "api/{controller}/{id}",
//            defaults: new { id = RouteParameter.Optional }
//        );
//    }
//}

Now I'm getting 404 error while accessing the API, my OWIN startup code also calling. Whats wrong here? please suggest!.

Upvotes: 3

Views: 469

Answers (1)

Mohammad Nikravesh
Mohammad Nikravesh

Reputation: 975

You have to add the following line of code at the end of your OWIN Configuration method:

app.UseWebApi(config);

Note: this method is located in:

using Owin; //Assembly System.Web.Http.Owin

Upvotes: 2

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