基于空项目模板创建使用Owin来host的WebApi项目

首先创建一个空的web项目，如下图所示：

项目创建成功以后，安装下面三个package.

Install-Package Microsoft.AspNet.WebApi -Version 5.2.2
Install-Package Microsoft.AspNet.WebApi.Owin -Version 5.2.2
Install-Package Microsoft.Owin.Host.SystemWeb -Version 3.0.0

创建Owin Startup 类

using System;
using System.Threading.Tasks;
using Microsoft.Owin;
using Owin;
using System.Web.Http;

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

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

            // Web API routes
            config.MapHttpAttributeRoutes();

            //WebApiConfig.Register(config);

            app.UseWebApi(config);
        }
    }
}

创建API Controller.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;

namespace FirstOwinWebApi.Controllers
{
    [RoutePrefix("api/HelloWorld")]
    public class HelloWorldController : ApiController
    {
        [Route("")]
        public IHttpActionResult Post()
        {

            return Ok<string>("Hello World");

        }

    }
}

F5运行，使用Postman访问Api

其他一些Owin中间件包：

Install-Package Microsoft.AspNet.WebApi -Version 5.2.2

Install-Package Microsoft.AspNet.WebApi.Owin -Version 5.2.2

Install-Package Microsoft.Owin.Host.SystemWeb -Version 3.0.0

Install-Package Microsoft.Owin.Cors -Version 3.0.0

Install-Package Microsoft.Owin.Security.OAuth -Version 3.0.0

Install-Package Microsoft.Owin.Security.Jwt -Version 3.0.0

Install-Package System.IdentityModel.Tokens.Jwt -Version 4.0.0

Install-Package Thinktecture.IdentityModel.Core Version 1.2.0

Install-Package Microsoft.AspNet.Identity.Owin -Version 2.0.1

Install-Package Microsoft.AspNet.Identity.EntityFramework -Version 2.0.1