rest - Web Api 2 + OWIN 3 + NInject.Web.WebApi.OwinHost，仅在启动时出错

Question

我正在为我的 DI 构建一个带有 Web API2、Owin 3 和 NInject Owinhost 的 rest API。

使用 NInject 提供的示例，我创建了一个“HttpConfiguration”对象并在 startup.cs 中调用 NInject 扩展方法，我得到一个错误:

Error activating HttpConfiguration More than one matching bindings are available. Matching bindings: 1) binding from HttpConfiguration to method 2) self-binding of HttpConfiguration 3) binding from HttpConfiguration to constant value Activation path: 1) Request for HttpConfiguration

Suggestions: 1) Ensure that you have defined a binding for HttpConfiguration only once.

我的代码在 Startup.cs 中如下所示:

 public void Configuration(IAppBuilder app)
    {
        Logger.Info("Entering Startup");

        config = new HttpConfiguration();

        ConfigureOAuth(app);

        // Web API configuration and services
        config.SuppressDefaultHostAuthentication();
        config.Filters.Add(new HostAuthenticationFilter("Bearer"));

        // Web API routes
        config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new {id = RouteParameter.Optional}
            );

        var appXmlType =
            config.Formatters.XmlFormatter.SupportedMediaTypes.FirstOrDefault(
                t => t.MediaType == "application/xml");
        config.Formatters.XmlFormatter.SupportedMediaTypes.Remove(appXmlType);

        app.UseNinjectMiddleware(CreateKernel);

        app.UseNinjectWebApi(config);

        app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);

        Logger.Info("Exiting Startup");

    }


    public static StandardKernel CreateKernel()
    {
        kernel = new StandardKernel();
        kernel.Load(Assembly.GetExecutingAssembly());

        kernel.Bind<HttpConfiguration>().ToSelf().Named("TestHttpConfiguration");

        return kernel;
    }

奇怪的是，当我在浏览器中刷新页面时，错误就出现了，这让我相信这只发生在应用程序启动时。

所以我对此感到困惑。有没有人遇到过同样的问题？

谢谢

文森特

Answer 1

我遇到了同样的错误，因为某种原因我同时安装了 Ninject.Web.WebApi.WebHost和 Ninject.Web.WebApi.OwinHost .

如果您在源代码中查找 OwinWebApiModule.cs和 WebApiWebHostModule.cs ，两个 Ninject 模块都有 HttpConfiguration 的绑定(bind)。 .

我删除了我不需要的那个并且一切正常。