没有 OWIN 身份验证管理器与请求相关联

问题描述

在尝试启用 owin & 后AspNet Identity 到我的 Web Api 项目(在 VS 2013 + .Net 4.5.1 中)我在每个有效或无效(请求不存在控制器)请求中收到以下错误:

After trying to enable owin & AspNet Identity to my Web Api project (in VS 2013 + .Net 4.5.1) I get the following error in each valid or unvalid(request to none exist controller) requests :

<Error>
<Message>An error has occurred.</Message>
<ExceptionMessage>
No OWIN authentication manager is associated with the request.
</ExceptionMessage>
<ExceptionType>System.InvalidOperationException</ExceptionType>
<StackTrace>
at System.Web.Http.Owin.PassiveAuthenticationMessageHandler.SuppressDefaultAuthenticationChallenges(HttpRequestMessage request) at System.Web.Http.Owin.PassiveAuthenticationMessageHandler.<SendAsync>d__0.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at System.Web.Http.HttpServer.<SendAsync>d__0.MoveNext()
</StackTrace>
</Error>

当我在调试模式下检查时，也没有处理异常！我还意识到 Startup 类中的 Configuration 永远不会被调用(实际上从未被调试器捕获).这是启动代码:

As I checked in debug mode, no exception is handled too! Also I realized that Configuration in Startup class is never called (indeed never caught by the debugger). here is the code for startup :

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

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

推荐答案

我终于找到问题了！在与新创建的项目逐行比较并发现没有区别后，我检查了两个项目的引用，是的！...所有问题都来自缺少包:

I found the problem finally! After comparing line by line with a newly created project and finding no difference , I checked references on both projects and yes!... All the problem was from missing package :

Microsoft.Owin.Host.SystemWeb

我不知道为什么在包安装阶段错过了这个打包，但奇怪的是为什么没有抛出任何构建异常?或者没有任何dll引用错误?

I don't know why this packaged is missed in package installation phase but the strange point is that why didn't any build exception thrown? or no any dll reference error?

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