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

1 using System; 2 using System.Threading.Tasks; 3 using Microsoft.Owin; 4 using Owin; 5 using System.Web.Http; 6  7 [assembly: OwinStartup(typeof(FirstOwinWebApi.Startup))] 8  9 namespace FirstOwinWebApi10 {11     public class Startup12     {13         public void Configuration(IAppBuilder app)14         {15             HttpConfiguration config = new HttpConfiguration();16 17             // Web API routes18             config.MapHttpAttributeRoutes();19 20             //WebApiConfig.Register(config);21 22             app.UseWebApi(config);23         }24     }25 }

创建API Controller.

1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Net; 5 using System.Net.Http; 6 using System.Web.Http; 7  8 namespace FirstOwinWebApi.Controllers 9 {10     [RoutePrefix("api/HelloWorld")]11     public class HelloWorldController : ApiController12     {13         [Route("")]14         public IHttpActionResult Post()15         {16 17             return Ok
     
      ("Hello World");18 19         }20 21     }22 }
     

 

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