我们已经在Ninject的WebAPI 2项目中成功使用了Microsoft ASP.Net Webhooks（特别是Stripe）。最近，我们迁移到了SimpleInjector，尽管其他一切顺利，但我们无法使该Webhook处理器正常工作。它不断抛出以下异常：System.MissingMethodException: 'No parameterless constructor defined for this object.'
相关的堆栈跟踪为：
mscorlib.dll!System.RuntimeType.CreateInstanceSlow(bool publicOnly, bool skipCheckThis, bool fillCache, ref System.Threading.StackCrawlMark stackMark) Unknown
mscorlib.dll!System.Activator.CreateInstance(System.Type type, bool nonPublic) Unknown
mscorlib.dll!System.Activator.CreateInstance(System.Type type) Unknown
Microsoft.AspNet.WebHooks.Common.dll!Microsoft.AspNet.WebHooks.Utilities.TypeUtilities.GetInstances<Microsoft.AspNet.WebHooks.IWebHookHandler>(System.Collections.Generic.IEnumerable<System.Reflection.Assembly> assemblies, System.Func<System.Type, bool> predicate) Unknown
Microsoft.AspNet.WebHooks.Receivers.dll!Microsoft.AspNet.WebHooks.ReceiverServices.GetHandlers() Unknown
Microsoft.AspNet.WebHooks.Receivers.dll!Microsoft.AspNet.WebHooks.DependencyScopeExtensions.GetHandlers(System.Web.Http.Dependencies.IDependencyScope services = {SimpleInjector.Integration.WebApi.SimpleInjectorWebApiDependencyResolver}) Unknown
Microsoft.AspNet.WebHooks.Receivers.dll!Microsoft.AspNet.WebHooks.WebHookReceiver.ExecuteWebHookAsync(string id = "", System.Web.Http.Controllers.HttpRequestContext context = {System.Web.Http.WebHost.WebHostHttpRequestContext}, System.Net.Http.HttpRequestMessage request = {System.Net.Http.HttpRequestMessage}, System.Collections.Generic.IEnumerable<string> actions = {string[1]}, object data = {Newtonsoft.Json.Linq.JObject}) Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<System.__Canon>.Start<Microsoft.AspNet.WebHooks.WebHookReceiver.<ExecuteWebHookAsync>d__22>(ref Microsoft.AspNet.WebHooks.WebHookReceiver.<ExecuteWebHookAsync>d__22 stateMachine) Unknown
Microsoft.AspNet.WebHooks.Receivers.dll!Microsoft.AspNet.WebHooks.WebHookReceiver.ExecuteWebHookAsync(string id, System.Web.Http.Controllers.HttpRequestContext context, System.Net.Http.HttpRequestMessage request, System.Collections.Generic.IEnumerable<string> actions, object data) Unknown
Microsoft.AspNet.WebHooks.Receivers.Stripe.dll!Microsoft.AspNet.WebHooks.StripeWebHookReceiver.ReceiveAsync(string id = "", System.Web.Http.Controllers.HttpRequestContext context = {System.Web.Http.WebHost.WebHostHttpRequestContext}, System.Net.Http.HttpRequestMessage request = {System.Net.Http.HttpRequestMessage}) Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<System.__Canon>.Start<Microsoft.AspNet.WebHooks.StripeWebHookReceiver.<ReceiveAsync>d__15>(ref Microsoft.AspNet.WebHooks.StripeWebHookReceiver.<ReceiveAsync>d__15 stateMachine) Unknown
Microsoft.AspNet.WebHooks.Receivers.Stripe.dll!Microsoft.AspNet.WebHooks.StripeWebHookReceiver.ReceiveAsync(string id, System.Web.Http.Controllers.HttpRequestContext context, System.Net.Http.HttpRequestMessage request) Unknown
Microsoft.AspNet.WebHooks.Receivers.dll!Microsoft.AspNet.WebHooks.Controllers.WebHookReceiversController.ProcessWebHook(string webHookReceiver = "stripe", string id = "") Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<System.__Canon>.Start<Microsoft.AspNet.WebHooks.Controllers.WebHookReceiversController.<ProcessWebHook>d__3>(ref Microsoft.AspNet.WebHooks.Controllers.WebHookReceiversController.<ProcessWebHook>d__3 stateMachine) Unknown
Microsoft.AspNet.WebHooks.Receivers.dll!Microsoft.AspNet.WebHooks.Controllers.WebHookReceiversController.ProcessWebHook(string webHookReceiver, string id) Unknown
[Lightweight Function]
System.Web.Http.dll!System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.GetExecutor.AnonymousMethod__8(object instance, object[] methodParameters) Unknown
System.Web.Http.dll!System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(System.Web.Http.Controllers.HttpControllerContext controllerContext, System.Collections.Generic.IDictionary<string, object> arguments, System.Threading.CancellationToken cancellationToken) Unknown
System.Web.Http.dll!System.Web.Http.Controllers.ApiControllerActionInvoker.InvokeActionAsyncCore(System.Web.Http.Controllers.HttpActionContext actionContext = {System.Web.Http.Controllers.HttpActionContext}, System.Threading.CancellationToken cancellationToken = IsCancellationRequested = false) Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<System.__Canon>.Start<System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0>(ref System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0 stateMachine) Unknown
System.Web.Http.dll!System.Web.Http.Controllers.ApiControllerActionInvoker.InvokeActionAsyncCore(System.Web.Http.Controllers.HttpActionContext actionContext, System.Threading.CancellationToken cancellationToken) Unknown
System.Web.Http.dll!System.Web.Http.Controllers.ApiControllerActionInvoker.InvokeActionAsync(System.Web.Http.Controllers.HttpActionContext actionContext, System.Threading.CancellationToken cancellationToken) Unknown
System.Web.Http.dll!System.Web.Http.Controllers.ActionFilterResult.ExecuteAsync(System.Threading.CancellationToken cancellationToken = IsCancellationRequested = false) Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<System.__Canon>.Start<System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2>(ref System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2 stateMachine) Unknown
System.Web.Http.dll!System.Web.Http.Controllers.ActionFilterResult.ExecuteAsync(System.Threading.CancellationToken cancellationToken) Unknown
System.Web.Http.dll!System.Web.Http.ApiController.ExecuteAsync(System.Web.Http.Controllers.HttpControllerContext controllerContext, System.Threading.CancellationToken cancellationToken) Unknown
System.Web.Http.dll!System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(System.Net.Http.HttpRequestMessage request = {System.Net.Http.HttpRequestMessage}, System.Threading.CancellationToken cancellationToken = IsCancellationRequested = false) 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.Cors.dll!System.Web.Http.Cors.CorsMessageHandler.SendAsync(System.Net.Http.HttpRequestMessage request = {System.Net.Http.HttpRequestMessage}, System.Threading.CancellationToken cancellationToken = IsCancellationRequested = false) Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<System.__Canon>.Start<System.Web.Http.Cors.CorsMessageHandler.<SendAsync>d__0>(ref System.Web.Http.Cors.CorsMessageHandler.<SendAsync>d__0 stateMachine) Unknown
System.Web.Http.Cors.dll!System.Web.Http.Cors.CorsMessageHandler.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.Net.Http.HttpRequestMessage}, System.Threading.CancellationToken cancellationToken = IsCancellationRequested = false) 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.WebHost.dll!System.Web.Http.WebHost.HttpControllerHandler.ProcessRequestAsyncCore(System.Web.HttpContextBase contextBase = {System.Web.HttpContextWrapper}) Unknown
mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start<System.Web.Http.WebHost.HttpControllerHandler.<ProcessRequestAsyncCore>d__0>(ref System.Web.Http.WebHost.HttpControllerHandler.<ProcessRequestAsyncCore>d__0 stateMachine) Unknown
System.Web.Http.WebHost.dll!System.Web.Http.WebHost.HttpControllerHandler.ProcessRequestAsyncCore(System.Web.HttpContextBase contextBase) Unknown
System.Web.dll!System.Web.TaskAsyncHelper.BeginTask(System.Func<System.Threading.Tasks.Task> taskFunc, System.AsyncCallback callback, object state = null) Unknown
System.Web.dll!System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() Unknown
System.Web.dll!System.Web.HttpApplication.ExecuteStep(System.Web.HttpApplication.IExecutionStep step = {System.Web.HttpApplication.CallHandlerExecutionStep}, ref bool completedSynchronously = false) 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.Hosting.IIS7WorkerRequest}, System.Web.HttpContext context = {System.Web.HttpContext}) Unknown
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext = 0x000002226c0521f0, 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]
和
System.MissingMethodException: No parameterless constructor defined for this object.
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.Activator.CreateInstance(Type type)
at Microsoft.AspNet.WebHooks.Utilities.TypeUtilities.GetInstances[T](IEnumerable`1 assemblies, Func`2 predicate)
at Microsoft.AspNet.WebHooks.ReceiverServices.GetHandlers()
at Microsoft.AspNet.WebHooks.DependencyScopeExtensions.GetHandlers(IDependencyScope services)
at Microsoft.AspNet.WebHooks.WebHookReceiver.<ExecuteWebHookAsync>d__22.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 Microsoft.AspNet.WebHooks.StripeWebHookReceiver.<ReceiveAsync>d__15.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 Microsoft.AspNet.WebHooks.Controllers.WebHookReceiversController.<ProcessWebHook>d__3.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.Threading.Tasks.TaskHelpersExtensions.<CastToObject>d__3`1.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.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>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.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.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.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()
我们的global.asax看起来像这样：
var container = new Container();
container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle();
container.Options.PropertySelectionBehavior = new
InjectPropertySelectionBehavior();
// Register our stuff
container.RegisterMvcControllers(Assembly.GetExecutingAssembly());
container.RegisterWebApiControllers(GlobalConfiguration.Configuration);
container.Verify();
GlobalConfiguration.Configuration.DependencyResolver = new
SimpleInjectorWebApiDependencyResolver(container);
DependencyResolver.SetResolver(new SimpleInjectorDependencyResolver(container));
我们正在像这样注册WebHook处理程序：
container.Register<IWebHookHandler, StripeWebhookHandler>(Lifestyle.Singleton);有没有人让它与SimpleInjector一起使用？或有任何想法可能有什么问题？
最佳答案
解：
IWebhookHandler需要注册为集合，因此请执行以下操作：container.Collection.Append(typeof(IWebHookHandler), typeof(StripeWebhookHandler));
代替：container.Register<IWebHookHandler, StripeWebhookHandler>(Lifestyle.Singleton);
是把戏！
我通过进入Microsoft Webhook程序集和SimpleInjector的源代码找出了这一点，并发现当Webhook程序集要求所有类型为IWebhookHandler的实例时，SimpleInjector在其GetServices实现中尝试查找所有IEnumerable<IWebhookHandler>，并且所以什么也没想出来。