我正在开发一个基于 cqrs 的电子商务应用程序，其中我的 Ioc 类如下:
x.For<ICacheStorage>().Use<HttpContextCacheAdapter>();
x.For<IDataContextFactory>().Use<DataContextFactory>();
x.For<IReportingUnitOfWork>().Use<ReportingUnitOfWork>();
x.For<IBus>().Use<DirectBus>();
x.For<IRouteMessages>().Use<MessageRouter>();
x.For<IDomainEventStorage<IDomainEvent>>().Use<DomainEventStorage<IDomainEvent>>();
x.For<IIdentityMap<IDomainEvent>>().Use<EventStoreIdentityMap<IDomainEvent>>();
x.For<IEventStoreUnitOfWork<IDomainEvent>>().Use<EventStoreUnitOfWork<IDomainEvent>>();
x.For<IDomainRepository<IDomainEvent>>().Use<DomainRepository<IDomainEvent>>();
x.For<IAuthorRepository>().Use<AuthorRepository>();
x.For<ICategoryRepository>().Use<CategoryRepository>();
x.For<IPublisherRepository>().Use<PublisherRepository>();
x.For<IBookRepository>().Use<BookRepository>();
x.For<IWishListRepository>().Use<WishListRepository>();
x.For<IReviewRepository>().Use<ReviewRepository>();
x.For<IUserLogRepository>().Use<UserLogRepository>();
x.For<IAuthorFacadeService>().Use<AuthorFacadeService>();
x.For<IBookCategoryFacadeService>().Use<BookCategoryFacadeService>();
x.For<IPublisherFacadeService>().Use<PublisherFacadeService>();
x.For<IWishListFacadeService>().Use<WishListFacadeService>();
当我运行我的代码时，它给了我一个异常并显示以下消息: 键不能为空。参数名称:key “/”应用程序中的服务器错误。
Key cannot be null.
Parameter name: key
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentNullException: Key cannot be null.
Parameter name: key
Source Error:
Line 16: RavenReaderContext context = null;
Line 17:
Line 18: if (_context.Contains(GetThreadName()))
Line 19: context = (RavenReaderContext)_context[GetThreadName()];
Line 20:
Source File: f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\Reporting\ReportingDataContextStorage\ThreadDataContextStorageContainer.cs Line: 18
Stack Trace:
[ArgumentNullException: Key cannot be null.
Parameter name: key]
System.Collections.Hashtable.ContainsKey(Object key) +10628627
System.Collections.Hashtable.Contains(Object key) +9
RavenProject.Reporting.ReportingDataContextStorage.ThreadDataContextStorageContainer.GetDataContext() in f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\Reporting\ReportingDataContextStorage\ThreadDataContextStorageContainer.cs:18
RavenProject.Reporting.DataContextFactory.GetDataContext() in f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\Reporting\DataContextFactory.cs:15
RavenProject.Reporting.ReportingUnitOfWork.get_DataContext() in f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\Reporting\ReportingUnitOfWork.cs:30
RavenProject.Reporting.ReportingRepository`1..ctor(IReportingUnitOfWork unitOfWork) in f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\Reporting\ReportingRepository.cs:21
RavenProject.Reporting.ReporitingRepositories.Implements.RavenUserRepository..ctor(IReportingUnitOfWork uow) in f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\Reporting\ReporitingRepositories\Implements\RavenUserRepository.cs:12
lambda_method(Closure , IArguments ) +118
StructureMap.Construction.<>c__DisplayClass2.<CreateBuilder>b__0(IArguments args) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Construction\BuilderCompiler.cs:56
StructureMap.Construction.InstanceBuilder.BuildInstance(IArguments args) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Construction\InstanceBuilder.cs:34
StructureMap.Pipeline.ConstructorInstance.Build(Type pluginType, BuildSession session, IInstanceBuilder builder) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ConstructorInstance.cs:233
[StructureMapException: StructureMap Exception Code: 207
Internal exception while creating Instance 'RavenProject.Reporting.ReporitingRepositories.Implements.RavenUserRepository, RavenProject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' of PluginType RavenProject.Reporting.ReporitingRepositories.Interfaces.IRavenUserRepository. Check the inner exception for more details.]
StructureMap.Pipeline.ConstructorInstance.Build(Type pluginType, BuildSession session, IInstanceBuilder builder) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ConstructorInstance.cs:245
StructureMap.Pipeline.ConstructorInstance.build(Type pluginType, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ConstructorInstance.cs:218
StructureMap.Pipeline.Instance.createRawObject(Type pluginType, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\Instance.cs:103
StructureMap.Pipeline.Instance.Build(Type pluginType, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\Instance.cs:69
StructureMap.Pipeline.ObjectBuilder.ConstructNew(Type pluginType, Instance instance, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ObjectBuilder.cs:39
StructureMap.Pipeline.ObjectBuilder.Resolve(Type pluginType, Instance instance, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ObjectBuilder.cs:27
StructureMap.BuildSession.CreateInstance(Type pluginType, Instance instance) in c:\BuildAgent\work\767273992e840853\src\StructureMap\BuildSession.cs:176
StructureMap.<>c__DisplayClass3.<.ctor>b__1() in c:\BuildAgent\work\767273992e840853\src\StructureMap\BuildSession.cs:36
StructureMap.BuildSession.CreateInstance(Type pluginType) in c:\BuildAgent\work\767273992e840853\src\StructureMap\BuildSession.cs:215
StructureMap.Pipeline.DefaultInstance.build(Type pluginType, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\DefaultInstance.cs:22
StructureMap.Pipeline.Instance.createRawObject(Type pluginType, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\Instance.cs:103
StructureMap.Pipeline.Instance.Build(Type pluginType, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\Instance.cs:69
StructureMap.Pipeline.ConstructorInstance.Get(String propertyName, Type pluginType, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ConstructorInstance.cs:74
StructureMap.Pipeline.ConstructorInstance.Get(String propertyName, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ConstructorInstance.cs:79
StructureMap.Pipeline.Arguments.Get(String propertyName) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\Arguments.cs:18
lambda_method(Closure , IArguments ) +76
StructureMap.Construction.<>c__DisplayClass2.<CreateBuilder>b__0(IArguments args) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Construction\BuilderCompiler.cs:56
StructureMap.Construction.InstanceBuilder.BuildInstance(IArguments args) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Construction\InstanceBuilder.cs:34
StructureMap.Pipeline.ConstructorInstance.Build(Type pluginType, BuildSession session, IInstanceBuilder builder) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ConstructorInstance.cs:237
StructureMap.Pipeline.ConstructorInstance.build(Type pluginType, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ConstructorInstance.cs:218
StructureMap.Pipeline.Instance.createRawObject(Type pluginType, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\Instance.cs:103
StructureMap.Pipeline.Instance.Build(Type pluginType, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\Instance.cs:69
StructureMap.Pipeline.ObjectBuilder.ConstructNew(Type pluginType, Instance instance, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ObjectBuilder.cs:39
StructureMap.Pipeline.ObjectBuilder.Resolve(Type pluginType, Instance instance, BuildSession session) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Pipeline\ObjectBuilder.cs:27
StructureMap.BuildSession.CreateInstance(Type pluginType, Instance instance) in c:\BuildAgent\work\767273992e840853\src\StructureMap\BuildSession.cs:176
StructureMap.<>c__DisplayClass3.<.ctor>b__1() in c:\BuildAgent\work\767273992e840853\src\StructureMap\BuildSession.cs:36
StructureMap.BuildSession.CreateInstance(Type pluginType) in c:\BuildAgent\work\767273992e840853\src\StructureMap\BuildSession.cs:215
StructureMap.Container.GetInstance(Type pluginType) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Container.cs:265
StructureMap.ObjectFactory.GetInstance(Type pluginType) in c:\BuildAgent\work\767273992e840853\src\StructureMap\ObjectFactory.cs:122
RavenProject.Utilities.RegisterEventHandlersInMessageRouter.GetCorrectlyInjectedEventHandler(Type eventHandler) in f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\Utilities\RegisterEventHandlersInMessageRouter.cs:64
RavenProject.Utilities.RegisterEventHandlersInMessageRouter.RegisterRoutes(MessageRouter messageRouter) in f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\Utilities\RegisterEventHandlersInMessageRouter.cs:38
RavenProject.Utilities.RegisterEventHandlersInMessageRouter.BootStrap() in f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\Utilities\RegisterEventHandlersInMessageRouter.cs:19
RavenProject.IoC.Initialize() in f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\DependencyResolution\IoC.cs:60
RavenProject.App_Start.StructuremapMvc.Start() in f:\Video\Latest Readable\CQRS Tutorial\CQRS By Authors\RavenBook\RavenProject\RavenProject\App_Start\StructuremapMvc.cs:9
[TargetInvocationException: Exception has been thrown by the target of an invocation.]
System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0
System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +192
System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +108
System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) +19
WebActivator.BaseActivationMethodAttribute.InvokeMethod() +236
WebActivator.ActivationManager.RunActivationMethods() +370
WebActivator.ActivationManager.RunPreStartMethods() +41
WebActivator.ActivationManager.Run() +64
[InvalidOperationException: The pre-application start initialization method Run on type WebActivator.ActivationManager threw an exception with the following error message: Exception has been thrown by the target of an invocation..]
System.Web.Compilation.BuildManager.InvokePreStartInitMethodsCore(ICollection`1 methods, Func`1 setHostingEnvironmentCultures) +559
System.Web.Compilation.BuildManager.InvokePreStartInitMethods(ICollection`1 methods) +132
System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath, Boolean& isRefAssemblyLoaded) +102
System.Web.Compilation.BuildManager.ExecutePreAppStart() +153
System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +516
[HttpException (0x80004005): The pre-application start initialization method Run on type WebActivator.ActivationManager threw an exception with the following error message: Exception has been thrown by the target of an invocation..]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9913572
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +101
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +254
扫描RegisterEventHandlersInMessageRouter类的RegisterRoute()方法时抛出异常。该类的源代码如下:
public class RegisterEventHandlersInMessageRouter
{
private static MethodInfo _createPublishActionMethod;
private static MethodInfo _registerMethod;
public static void BootStrap()
{
new RegisterEventHandlersInMessageRouter().RegisterRoutes(ObjectFactory.GetInstance<IRouteMessages>() as MessageRouter);
}
public void RegisterRoutes(MessageRouter messageRouter)
{
_createPublishActionMethod = GetType().GetMethod("CreatePublishAction");
_registerMethod = messageRouter.GetType().GetMethod("Register");
var events = EventHandlerFactory.GetEvents();
var eventHandlers = EventHandlerFactory.GetEventHandlers();
foreach (var theEvent in events)
{
IList<Type> eventHandlerTypes;
if (!eventHandlers.TryGetValue(theEvent, out eventHandlerTypes))
throw new Exception(string.Format("No event handlers found for event '{0}'", theEvent.FullName));
foreach (var eventHandler in eventHandlerTypes)
{
var injectedEventHandler = GetCorrectlyInjectedEventHandler(eventHandler);
var action = CreateTheProperAction(theEvent, injectedEventHandler);
RegisterTheCreatedActionWithTheMessageRouter(messageRouter, theEvent, action);
}
}
}
public Action<TMessage> CreatePublishAction<TMessage, TMessageHandler>(TMessageHandler messageHandler)
where TMessage : class
where TMessageHandler : IEventHandler<TMessage>
{
return messageHandler.Execute;
}
private static void RegisterTheCreatedActionWithTheMessageRouter(MessageRouter messageRouter, Type eventType, object action)
{
_registerMethod.MakeGenericMethod(eventType).Invoke(messageRouter, new[] { action });
}
private object CreateTheProperAction(Type eventType, object eventHandler)
{
return _createPublishActionMethod.MakeGenericMethod(eventType, eventHandler.GetType()).Invoke(this, new[] { eventHandler });
}
private static object GetCorrectlyInjectedEventHandler(Type eventHandler)
{
return ObjectFactory.GetInstance(eventHandler);
}
}
我还提到了抛出异常的类定义:
public class ThreadDataContextStorageContainer : IDataContextStorageContainer
{
private static readonly Hashtable _context = new Hashtable();
public RavenReaderContext GetDataContext()
{
RavenReaderContext context = null;
if (_context.Contains(GetThreadName()))
context = (RavenReaderContext)_context[GetThreadName()];
return context;
}
public void Store(RavenReaderContext context)
{
if (_context.Contains(GetThreadName()))
_context[GetThreadName()] = context;
else
_context.Add(GetThreadName(), context);
}
private static string GetThreadName()
{
return Thread.CurrentThread.Name;
}
}
我的 Repository 类定义如下:
public interface IRavenUserRepository : IReportingRepository<RavenUser>
{
}
和
public class RavenUserRepository:ReportingRepository<RavenUser>,IRavenUserRepository
{
public RavenUserRepository(IReportingUnitOfWork uow)
: base(uow)
{
}
}
我尝试了很多时间来解决这个问题，但还没有完成。
注意:我正在关注 Mark Nihof (Fohjin) 的 cqrs 架构
最佳答案
我刚刚检查了 Thread.CurrentThread.Name 是否为空。如果为 null，那么我分配了一个名称并按如下方式返回:
private static string GetThreadName()
{
if (Thread.CurrentThread.Name == null)
Thread.CurrentThread.Name = "MainThread";
return Thread.CurrentThread.Name;
}
.现在它工作正常 -
关于c# - IOC-容器使用。 key 不能为空。参数名称 : key，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23017239/