windows service承载的web api宿主搭建（Microsoft.Owin+service）

今天突然想起改良一下以前搭建的“windows service承载的web api”服务，以前也是直接引用的类库，没有使用nuget包，时隔几年应该很旧版本了吧。所以本次把需要nuget获取的包记录一下。

<?xml version="1.0" encoding="utf-8"?>

<packages>

  <package id="log4net" version="2.0.8" targetFramework="net461" />

  <package id="Microsoft.AspNet.WebApi.Client" version="5.2.7" targetFramework="net461" />

  <package id="Microsoft.AspNet.WebApi.Core" version="5.2.7" targetFramework="net461" />

  <package id="Microsoft.AspNet.WebApi.Owin" version="5.2.7" targetFramework="net461" />

  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net461" />

  <package id="Microsoft.Owin.Host.SystemWeb" version="4.0.0" targetFramework="net461" />

  <package id="Microsoft.Owin.Hosting" version="4.0.0" targetFramework="net461" />

  <package id="Newtonsoft.Json" version="12.0.1" targetFramework="net461" />

  <package id="Owin" version="1.0" targetFramework="net461" />

</packages>

还有几点需要注意一下：

1、设定webapi仅仅使用json格式

using System;

using System.Collections.Generic;

using System.Net.Http;

using System.Net.Http.Formatting;

using System.Net.Http.Headers;

namespace NetMiddlewareSvr

{

    /// <summary>

    /// Json格式头部类

    /// </summary>

    public class JsonContentNegotiator : IContentNegotiator

    {

        private readonly JsonMediaTypeFormatter _jsonFormatter;

        public JsonContentNegotiator(JsonMediaTypeFormatter formatter)

        {

            _jsonFormatter = formatter;

        }

        public ContentNegotiationResult Negotiate(Type type, HttpRequestMessage request, IEnumerable<MediaTypeFormatter> formatters)

        {

            var result = new ContentNegotiationResult(_jsonFormatter, new MediaTypeHeaderValue("application/json"));

            return result;

        }

    }

}

2、修改默认路由规则：

using Owin;

using System.Net.Http.Formatting;

using System.Web.Http;

namespace NetMiddlewareSvr

{

    public class RegisterRoutesStartup

    {

        public void Configuration(IAppBuilder appBuilder)

        {

            HttpConfiguration config = new HttpConfiguration();

            //自定义路由

            config.Routes.MapHttpRoute(

              name: "CustomApi",

              routeTemplate: "api/{controller}/{action}/{id}",

              defaults: new { id = RouteParameter.Optional }

            );

            //只响应Json请求

            var jsonFormatter = new JsonMediaTypeFormatter();

            config.Services.Replace(typeof(IContentNegotiator), new JsonContentNegotiator(jsonFormatter));

            appBuilder.UseWebApi(config);

        }

    }

}

3、启动监听

 public partial class NetMiddwareService : ServiceBase

    {

        private IDisposable hostObject;

        public NetMiddwareService()

        {

            InitializeComponent();

        }

        protected override void OnStart(string[] args)

        {

            hostObject = hostObject = WebApp.Start<RegisterRoutesStartup>("http://" + "127.0.0.1" + ":5990");

        }

        protected override void OnStop()

        {

        }

    }

补充一下nuget的顺序：Microsoft.Owin->Microsoft.Owin.Hosting->Microsoft.AspNet.WebApi.Core,剩下的是依赖包自动导入的。当然log4net和Newtonsoft.Json不是owin的依赖包