ASP.Net WebAPI OWIN:为什么Request.GetOwinContext()返回null? [英] ASP.Net WebAPI OWIN: Why would Request.GetOwinContext() return null?

问题描述

在我的生产代码中，我们遇到了一个问题，其中Request.GetOwinContext()始终返回null.

In my production code we're having a problem where Request.GetOwinContext() always returns null.

我设置了一个小型测试WebAPI控制器来尝试找出问题所在:

I setup a small test WebAPI controller to try and isolate the problem:

    public class TestController : ApiController
{
    [HttpGet]
    public async Task<IHttpActionResult> GetAsyncContext(string provider)
    {
        if (HttpContext.Current.GetOwinContext() == null)
            return this.BadRequest("No HttpContext.Current Owin Context");

        if (Request.GetOwinContext() == null)
            return this.BadRequest("No Owin Context");

        return this.Ok();
    }

    [HttpGet]
    public IHttpActionResult GetContext(string provider)
    {
        if (HttpContext.Current.GetOwinContext() == null)
            return this.BadRequest("No HttpContext.Current Owin Context");

        if (Request.GetOwinContext() == null)
            return this.BadRequest("No Owin Context");

        return this.Ok();
    }
}

起初，我认为它可能与action方法异步运行有关，但是运行上述方法之后，事实证明，在两个版本中，Request.GetOwinContext()都返回null.

At first I thought it might have something to do with the action method running asynchronously, but after running the above, it turns out that in both versions, Request.GetOwinContext() returns null.

我正在使用Microsoft.AspNet.WebApi.Owin.5.1.1(似乎在其中定义了GetOwinContext()扩展方法的地方).

I am using Microsoft.AspNet.WebApi.Owin.5.1.1 (which is where it seems the GetOwinContext() extension method is defined).

关于这里发生的事情有什么想法吗?

Any ideas on what's happening here???

推荐答案

另一个原因(尤其是在升级ASP.NET MVC4和/或空WebApi模板之后)在WebAPI项目的根目录中缺少Startup.cs文件.

Another cause (especially after upgrading form ASP.NET MVC4 and / or Empty WebApi Template) is missing Startup.cs file in the root of WebAPI project.

此外，请确保已安装Microsoft.Owin.Host.SystemWeb软件包.

Also, make sure that you have installed Microsoft.Owin.Host.SystemWeb package.

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Owin;
using Owin;

[assembly: OwinStartup(typeof(TestMVC5.Startup))]

namespace TestMVC5
{
    public partial class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            ConfigureAuth(app);
        }
    }
}

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