Question

基本上是标题所说的。这是完整的github项目：

https://github.com/dsidirop/PetTrackerOAuth.git

由于asp.net堆栈内部存在异常，控制器根本不会被实例化（最后会显示完整的异常）：

[RoutePrefix("api/account")]
public sealed class AccountController : BaseApiController
{
    private IPetTrackerUnitOfWork _repo;

    public AccountController(IPetTrackerUnitOfWork repo) //this one isn't even getting called
    {
        _repo = repo; // System.Web.Mvc.DependencyResolver.Current.GetService(typeof(IPetTrackerUnitOfWork)); //strangely this works just fine
    }
}

Unity配置：

  [assembly: WebActivatorEx.PreApplicationStartMethod(typeof(UnityWebActivator), nameof(UnityWebActivator.Start))]
  [assembly: WebActivatorEx.ApplicationShutdownMethod(typeof(UnityWebActivator), nameof(UnityWebActivator.Shutdown))]

  namespace AngularJSAuthentication.API.Unity
  {
     static public class UnityWebActivator
     {
            static public void Start() => StartWithSpecifiedConnection();
            static public void StartWithSpecifiedConnection(Type typeOfDbContextToUse = null)
            {
                var configuredUnityContainer = ((ConfiguredUnityContainer) ConfiguredUnityContainer.I).Init(typeOfDbContextToUse);

                FilterProviders.Providers.Remove(FilterProviders.Providers.OfType<FilterAttributeFilterProvider>().First());
                FilterProviders.Providers.Add(new UnityFilterAttributeFilterProvider(configuredUnityContainer));

                 GlobalConfiguration.Configuration.DependencyResolver = new global::Unity.WebApi.UnityDependencyResolver(configuredUnityContainer);
                DynamicModuleUtility.RegisterModule(typeof(UnityPerRequestHttpModule));
            }

            static public void Shutdown() => ConfiguredUnityContainer.I.Dispose();
    }

    public class ConfiguredUnityContainer : UnityContainer
    {
        static public IUnityContainer I => _lazyInstance.Value;

        static private readonly Lazy<IUnityContainer> _lazyInstance = new Lazy<IUnityContainer>(() => new ConfiguredUnityContainer());

        private ConfiguredUnityContainer()
        {
        }

        public IUnityContainer Init(Type typeOfDbContextToUse = null)
        {
            this.RegisterType(typeof(IPetTrackerDbContext), typeOfDbContextToUse ?? typeof(PetTrackerDbContextProduction), new PerRequestLifetimeManager());
            this.RegisterType<IPetTrackerDbContext, PetTrackerDbContextProduction>(new PerRequestLifetimeManager());
            this.RegisterType<IPetTrackerDbContext, PetTrackerDbContextProduction>(new PerRequestLifetimeManager());
            this.RegisterType<IPetTrackerUnitOfWork, PetTrackerUnitOfWork>(new PerRequestLifetimeManager());
            this.RegisterType<IUserStore<IdentityUser>, PetTrackerUserStore>(new PerRequestLifetimeManager());
            this.RegisterType<IRoleStore<IdentityRole, string>, PetTrackerRoleStore>(new PerRequestLifetimeManager());
            this.RegisterType<IPetTrackerRoleManager, PetTrackerRoleManager>(new PerRequestLifetimeManager());
            this.RegisterType<IPetTrackerUserManager, PetTrackerUserManager>(new PerRequestLifetimeManager());
            this.RegisterType<IPetTrackerUserRepository, PetTrackerUserRepository>(new PerRequestLifetimeManager());
            this.RegisterType<IPetTrackerRoleRepository, PetTrackerRoleRepository>(new PerRequestLifetimeManager());
            this.RegisterType(typeof(IRepository<>), typeof(GenericRepository<>), new PerRequestLifetimeManager());
            this.RegisterInstance(typeof(HttpConfiguration), GlobalConfiguration.Configuration);

            return this;
        }
    }
}

异常消息：

Exception thrown: 'System.ArgumentException' in System.Core.dll

Additional information: Type 'AngularJSAuthentication.API.Controllers.AccountController' does not have a default constructor

例外：

System.Core.dll!System.Linq.Expressions.Expression.New(System.Type type)    Unknown
System.Web.Http.dll!System.Web.Http.Internal.TypeActivator.Create<System.Web.Http.Controllers.IHttpController>(System.Type instanceType)    Unknown
System.Web.Http.dll!System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(System.Net.Http.HttpRequestMessage request, System.Type controllerType, out System.Func<System.Web.Http.Controllers.IHttpController> activator)    Unknown
System.Web.Http.dll!System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(System.Net.Http.HttpRequestMessage request, System.Web.Http.Controllers.HttpControllerDescriptor controllerDescriptor, System.Type controllerType) Unknown
System.Web.Http.dll!System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(System.Net.Http.HttpRequestMessage request)   Unknown
System.Web.Http.dll!System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<System.__Canon>.Start<System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1>(ref System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1 stateMachine)    Unknown
System.Web.Http.dll!System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) Unknown
System.Net.Http.dll!System.Net.Http.HttpMessageInvoker.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)  Unknown
System.Web.Http.dll!System.Web.Http.Dispatcher.HttpRoutingDispatcher.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)    Unknown
System.Net.Http.dll!System.Net.Http.DelegatingHandler.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)   Unknown
System.Web.Http.dll!System.Web.Http.HttpServer.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)  Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<System.__Canon>.Start<System.Web.Http.HttpServer.<SendAsync>d__0>(ref System.Web.Http.HttpServer.<SendAsync>d__0 stateMachine)  Unknown
System.Web.Http.dll!System.Web.Http.HttpServer.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)  Unknown
System.Net.Http.dll!System.Net.Http.HttpMessageInvoker.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)  Unknown
System.Web.Http.Owin.dll!System.Web.Http.Owin.HttpMessageHandlerAdapter.InvokeCore(Microsoft.Owin.IOwinContext context, Microsoft.Owin.IOwinRequest owinRequest, Microsoft.Owin.IOwinResponse owinResponse) Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start<System.Web.Http.Owin.HttpMessageHandlerAdapter.<InvokeCore>d__0>(ref System.Web.Http.Owin.HttpMessageHandlerAdapter.<InvokeCore>d__0 stateMachine)    Unknown
System.Web.Http.Owin.dll!System.Web.Http.Owin.HttpMessageHandlerAdapter.InvokeCore(Microsoft.Owin.IOwinContext context, Microsoft.Owin.IOwinRequest owinRequest, Microsoft.Owin.IOwinResponse owinResponse) Unknown
System.Web.Http.Owin.dll!System.Web.Http.Owin.HttpMessageHandlerAdapter.Invoke(Microsoft.Owin.IOwinContext context) Unknown
Microsoft.Owin.dll!Microsoft.Owin.Infrastructure.OwinMiddlewareTransition.Invoke(System.Collections.Generic.IDictionary<string, object> environment)    Unknown
Microsoft.Owin.Cors.dll!Microsoft.Owin.Cors.CorsMiddleware.Invoke(System.Collections.Generic.IDictionary<string, object> environment)   Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start<Microsoft.Owin.Cors.CorsMiddleware.<Invoke>d__0>(ref Microsoft.Owin.Cors.CorsMiddleware.<Invoke>d__0 stateMachine)    Unknown
Microsoft.Owin.Cors.dll!Microsoft.Owin.Cors.CorsMiddleware.Invoke(System.Collections.Generic.IDictionary<string, object> environment)   Unknown
Microsoft.Owin.Host.SystemWeb.dll!Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContextStage.RunApp(System.Func<System.Collections.Generic.IDictionary<string, object>, System.Threading.Tasks.Task> entryPoint, System.Collections.Generic.IDictionary<string, object> environment, System.Threading.Tasks.TaskCompletionSource<object> tcs, Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult result)    Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start<Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContextStage.<RunApp>d__5>(ref Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContextStage.<RunApp>d__5 stateMachine)  Unknown
Microsoft.Owin.Host.SystemWeb.dll!Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContextStage.RunApp(System.Func<System.Collections.Generic.IDictionary<string, object>, System.Threading.Tasks.Task> entryPoint, System.Collections.Generic.IDictionary<string, object> environment, System.Threading.Tasks.TaskCompletionSource<object> tcs, Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult result)    Unknown
Microsoft.Owin.Host.SystemWeb.dll!Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContextStage.BeginEvent(object sender, System.EventArgs e, System.AsyncCallback cb, object extradata)  Unknown
System.Web.dll!System.Web.HttpApplication.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()   Unknown
System.Web.dll!System.Web.HttpApplication.ExecuteStep(System.Web.HttpApplication.IExecutionStep step, ref bool completedSynchronously)  Unknown
System.Web.dll!System.Web.HttpApplication.PipelineStepManager.ResumeSteps(System.Exception error)   Unknown
System.Web.dll!System.Web.HttpApplication.BeginProcessRequestNotification(System.Web.HttpContext context, System.AsyncCallback cb)  Unknown
System.Web.dll!System.Web.HttpRuntime.ProcessRequestNotificationPrivate(System.Web.Hosting.IIS7WorkerRequest wr, System.Web.HttpContext context)    Unknown
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags) Unknown
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags)   Unknown
[Native to Managed Transition]  
[Managed to Native Transition]  
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags) Unknown
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags)   Unknown
[AppDomain Transition]

Answer 1

下载了你的项目并尝试运行得到了你发布的异常。

目前我们使用Unity作为IoC Container。 IoC容器将处理控制器类的初始化。要使IoC容器创建控制器的实例，控制器类需要具有无参数的公共构造函数 - 默认构造函数

我们需要添加以下内容，

public AccountController() : base() { }

现在，当我尝试运行时，我正在下面，第44行中的例外 - 注册块

配置中是否有我遗漏的东西？请检查并告知我们进一步检查。

ASP.Net：Unity Dependency Injection会在控制器上抛出异常

1 个答案: