在调用操作之前处理的导出的 Web API 控制器答案

【问题标题】：Exported web API controller disposed before calling action在调用操作之前处理的导出的 Web API 控制器
【发布时间】：2016-05-05 23:53:15
【问题描述】：

我有一个 Web 项目，它是 ASp.net MVC，我的控制器是用于路由和 api 控制器的 mvc 控制器。我正在使用托管可扩展性框架 (MEF)。我刚刚开始登录页面，其中包含 mvc 帐户控制器和 ap 帐户控制器。登录页面运行，当我提交用户名和密码时，它从角度控制器调用 api 控制器，然后调用 api 控制器的构造函数，然后在调用我的登录操作之前调用 Dispose，然后找不到资源的错误页面请求的 URL：/account/login 我使用 WebSecurity 类 (WebMatrix.WebData) 的登录操作

这是我的 BaseApi 控制器

 public class ApiControllerBase : ApiController, IServiceAwareController
    {
        List<IServiceContract> _DisposableServices;

        protected virtual void RegisterServices(List<IServiceContract> disposableServices)
        {
        }

        void IServiceAwareController.RegisterDisposableServices(List<IServiceContract> disposableServices)
        {
            RegisterServices(disposableServices);
        }

        List<IServiceContract> IServiceAwareController.DisposableServices
        {
            get
            {
                if (_DisposableServices == null)
                    _DisposableServices = new List<IServiceContract>();

                return _DisposableServices;
            }
        }

        protected void ValidateAuthorizedUser(string userRequested)
        {
            string userLoggedIn = User.Identity.Name;
            if (userLoggedIn != userRequested)
                throw new SecurityException("Attempting to access data for another user.");
        }

        protected HttpResponseMessage GetHttpResponse(HttpRequestMessage request, Func<HttpResponseMessage> codeToExecute)
        {
            HttpResponseMessage response = null;

            try
            {
                response = codeToExecute.Invoke();
            }
            catch (SecurityException ex)
            {
                response = request.CreateResponse(HttpStatusCode.Unauthorized, ex.Message);
            }
            catch (FaultException<AuthorizationValidationException> ex)
            {
                response = request.CreateResponse(HttpStatusCode.Unauthorized, ex.Message);
            }
            catch (FaultException ex)
            {
                response = request.CreateResponse(HttpStatusCode.InternalServerError, ex.Message);
            }
            catch (Exception ex)
            {
                response = request.CreateResponse(HttpStatusCode.InternalServerError, ex.Message);
            }

            return response;
        }
    }

这是我的帐户 Api 控制器

 [Export]
    [PartCreationPolicy(CreationPolicy.NonShared)]
    [RoutePrefix("api/account")]
    public class AccountApiController : ApiControllerBase
    {
        [ImportingConstructor]
        public AccountApiController(ISecurityAdapter securityAdapter)
        {
            _SecurityAdapter = securityAdapter;
        }

        ISecurityAdapter _SecurityAdapter;


        [HttpPost]
        [Route("login")]
        public HttpResponseMessage Login(HttpRequestMessage request, [FromBody]AccountLoginModel accountModel)
        {
            return GetHttpResponse(request, () =>
            {
                HttpResponseMessage response = null;

                bool success = _SecurityAdapter.Login(accountModel.LoginEmail, accountModel.Password, accountModel.RememberMe);
                if (success)
                    response = request.CreateResponse(HttpStatusCode.OK);
                else
                    response = request.CreateErrorResponse(HttpStatusCode.Unauthorized, "Unauthorized login.");

                return response;
            });
        }


    }

我注册了我的 mef 扩展类，它在 globa asax 中处理 MEF

 AggregateCatalog catalog = new AggregateCatalog();
            catalog.Catalogs.Add(new AssemblyCatalog(Assembly.GetExecutingAssembly()));
            CompositionContainer container = MEFLoader.Init(catalog.Catalogs);

            DependencyResolver.SetResolver(new MefDependencyResolver(container)); // view controllers
            GlobalConfiguration.Configuration.DependencyResolver = new MefAPIDependencyResolver(container); // web api controllers

这也是我的 mef 依赖解析器类

public class MefAPIDependencyResolver : IDependencyResolver
    {
        public MefAPIDependencyResolver(CompositionContainer container)
        {
            _Container = container;
        }

        CompositionContainer _Container;

        public IDependencyScope BeginScope()
        {
            return this;
        }

        public object GetService(Type serviceType)
        {
            return _Container.GetExportedValueByType(serviceType);
        }

        public IEnumerable<object> GetServices(Type serviceType)
        {
            return _Container.GetExportedValuesByType(serviceType);
        }

        public void Dispose()
        {
        }
    }

我失去了情节。提前感谢您的帮助。

【问题讨论】：

标签： c# angularjs asp.net-web-api mef

【解决方案1】：

哎呀，这是我的错。这是关于对 mvc 控制器有操作的 html 表单，但它不存在所以而不是

<form class="loginForm" action="@Url.Action("Login","Account")" method="post" name="loginForm">

所以我把它替换为

    <form class="loginForm" name="loginForm"> <!--Without action-->
    <!--and submit button-->
<button type="submit" class="btn blue pull-right" ng-click="login()">

【讨论】：