找不到类型或名称空间名称“ HttpConfiguration”（是否缺少using指令或程序集引用？

Question

Error :=- AuthorizationServer.Api/Startup.cs(17,17): Error CS0246: The type or namespace name 'HttpConfiguration' could not be found (are you missing a using directive or an assembly reference?) (CS0246) (AuthorizationServer.Api)

i am using visual studio community for mac and first error was system.web.http error so i follow the approach listed here:-

MVC 5 on Mono: Could not load file or assembly 'System.Web.Entity' or one of its dependencies

Installed System.Web.Common.Http But Following Error It is Showing In my startup.cs File How to resolve This ?

code:-

using AuthorizationServer.Api.Formats;
using AuthorizationServer.Api.Providers;
using Microsoft.Owin;
using Microsoft.Owin.Security.OAuth;
using Owin;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http.Common;

namespace AuthorizationServer.Api
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            System.Web.Http.HttpConfiguration config = new System.Web.Http.HttpConfiguration();

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

            ConfigureOAuth(app);

            app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);

            app.UseWebApi(config);

        }

Answer 1

after referencing the following NuGet: Microsoft ASP.NET Web API 2.2 Core Libraries

these are my Owin packages i have referenced:

startup.cs looks like this:

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        HttpConfiguration config = new HttpConfiguration();

        // Web API routes
        config.MapHttpAttributeRoutes();

        // Removed for clarity
        // ConfigureOAuth(app);

        app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);

        app.UseWebApi(config);
    }
}

Answer 2

HttpConfiguration represents a configuration of HttpServer instances.

It is in the

System.Web.Http library