Question

我正在努力让Autofac与WebApi合作。我将ApiControllers放在与主Web项目不同的项目中。

InventorySystem.Web.UI InventorySystem.Web.Api.Controllers

每当我尝试浏览api路线时，我都会收到回复：

<Exception xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <ExceptionType>System.ArgumentNullException</ExceptionType>
    <Message>Value cannot be null. Parameter name: value</Message>
    <StackTrace>
at System.Web.Http.Controllers.HttpControllerContext.set_Controller(IHttpController value)
at System.Web.Http.Dispatcher.DefaultHttpControllerFactory.CreateInstance(HttpControllerContext controllerContext, HttpControllerDescriptor controllerDescriptor)
at System.Web.Http.Dispatcher.DefaultHttpControllerFactory.CreateController(HttpControllerContext controllerContext, String controllerName)
at Autofac.Integration.WebApi.AutofacControllerFactory.CreateController(HttpControllerContext controllerContext, String controllerName)
at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsyncInternal(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    </StackTrace>
</Exception>

当我单步执行Autofac代码时，我看到我的控制器已经注册，但AutofacControllerActivator.Create（）返回null。特别是这条线 return（ResolutionExtensions.ResolveOptional（scope，controllerType）为IHttpController）;

autofac代码： string binDirectory = Path.Combine（HttpRuntime.AppDomainAppPath，“bin”）;

        var builder = new ContainerBuilder();

        builder.ConfigureWebApi(GlobalConfiguration.Configuration);

        builder.RegisterControllers(Assembly.GetExecutingAssembly()).PropertiesAutowired();
        builder.RegisterApiControllers(Assembly.LoadFile(Path.Combine(binDirectory, "InventorySystem.Web.Api.dll"))).PropertiesAutowired();
        builder.RegisterFilterProvider();            

        var container = builder.Build();

        DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
        GlobalConfiguration.Configuration.ServiceResolver.SetResolver(new AutofacWebApiDependencyResolver(container));

我错过了什么吗？

由于

Answer 1

RegisterApiControllers注册扩展查找实现IHttpController接口并且名称以“Controller”结尾的类型。您的控制器类名称后缀为“Controller”吗？

Answer 2

您可能需要查看此SO question，其中其他程序集从其中一个引用API控制器开始接收。

Answer 3

您是否忘记使用构建容器注册Api控制器的构造函数依赖项？

HostingEnvironment.MapPath（“〜/ bin”）是另一种获取bin目录中文件路径的好方法。

Answer 4

var builder = new ContainerBuilder();   
builder.Update(container);
 var webApiResolver = new Autofac.Integration.WebApi.AutofacWebApiDependencyResolver(container);
    System.Web.Http.GlobalConfiguration.Configuration.DependencyResolver = webApiResolver;

ASP.NET WebApi + Autofac找不到ApiControllers

4 个答案: