Ninject空引用异常

Question

我是个新手，看到了一个异常，不知道该怎么做。有人能帮帮忙吗？-

Object reference not set to an instance of an object.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

[NullReferenceException: Object reference not set to an instance of an object.]
   System.Object.GetType() +0
   Ninject.Core.Creation.Providers.InjectionProviderBase.GetValueFromInlineArgument(IContext context, ITarget target) in \Ninject\src\Core\Creation\Providers\InjectionProviderBase.cs:139
   Ninject.Core.Creation.Providers.InjectionProviderBase.ResolveConstructorArguments(IContext context, ConstructorInjectionDirective directive) in \Ninject\src\Core\Creation\Providers\InjectionProviderBase.cs:109
   Ninject.Core.Creation.Providers.InjectionProviderBase.CallInjectionConstructor(IContext context) in \Ninject\src\Core\Creation\Providers\InjectionProviderBase.cs:79
   Ninject.Core.Creation.Providers.InjectionProviderBase.Create(IContext context) in \Ninject\src\Core\Creation\Providers\InjectionProviderBase.cs:60
   Ninject.Core.Activation.ActivatorBase.Create(IContext context, Object& instance) in \Ninject\src\Core\Activation\ActivatorBase.cs:114
   Ninject.Core.Behavior.BehaviorBase.CreateInstance(IContext context, Object& instance) in \Ninject\src\Core\Behavior\BehaviorBase.cs:102
   Ninject.Core.Behavior.TransientBehavior.Resolve(IContext context) in \Ninject\src\Core\Behavior\TransientBehavior.cs:55
   Ninject.Core.KernelBase.ResolveInstance(Type service, IContext context, Boolean isEagerActivation) in \Ninject\src\Core\KernelBase.cs:566
   Ninject.Core.KernelBase.Get(Type type, IContext context) in \Ninject\src\Core\KernelBase.cs:278
   Ninject.Core.Resolution.Resolvers.StandardResolver.ResolveInstance(IContext outerContext, IContext innerContext) in \Ninject\src\Core\Resolution\Resolvers\StandardResolver.cs:54
   Ninject.Core.Resolution.Resolvers.ResolverBase.Resolve(IContext outerContext, IContext innerContext) in \Ninject\src\Core\Resolution\Resolvers\ResolverBase.cs:80
   Ninject.Core.Creation.Providers.InjectionProviderBase.ResolveConstructorArguments(IContext context, ConstructorInjectionDirective directive) in \Ninject\src\Core\Creation\Providers\InjectionProviderBase.cs:119
   Ninject.Core.Creation.Providers.InjectionProviderBase.CallInjectionConstructor(IContext context) in \Ninject\src\Core\Creation\Providers\InjectionProviderBase.cs:79
   Ninject.Core.Creation.Providers.InjectionProviderBase.Create(IContext context) in \Ninject\src\Core\Creation\Providers\InjectionProviderBase.cs:60
   Ninject.Core.Activation.ActivatorBase.Create(IContext context, Object& instance) in \Ninject\src\Core\Activation\ActivatorBase.cs:114
   Ninject.Core.Behavior.BehaviorBase.CreateInstance(IContext context, Object& instance) in \Ninject\src\Core\Behavior\BehaviorBase.cs:102
   Ninject.Core.Behavior.TransientBehavior.Resolve(IContext context) in \Ninject\src\Core\Behavior\TransientBehavior.cs:55
   Ninject.Core.KernelBase.ResolveInstance(Type service, IContext context, Boolean isEagerActivation) in \Ninject\src\Core\KernelBase.cs:566
   Ninject.Core.KernelBase.Get(Type type, IContext context) in \Ninject\src\Core\KernelBase.cs:278
   Ninject.Core.Resolution.Resolvers.StandardResolver.ResolveInstance(IContext outerContext, IContext innerContext) in \Ninject\src\Core\Resolution\Resolvers\StandardResolver.cs:54
   Ninject.Core.Resolution.Resolvers.ResolverBase.Resolve(IContext outerContext, IContext innerContext) in \Ninject\src\Core\Resolution\Resolvers\ResolverBase.cs:80
   Ninject.Core.Activation.Strategies.FieldInjectionStrategy.Initialize(IContext context, Object& instance) in \Ninject\src\Core\Activation\Strategies\FieldInjectionStrategy.cs:59
   Ninject.Core.Activation.ActivatorBase.Create(IContext context, Object& instance) in \Ninject\src\Core\Activation\ActivatorBase.cs:130
   Ninject.Core.KernelBase.InjectExistingObject(Object instance) in \Ninject\src\Core\KernelBase.cs:599
   Ninject.Core.KernelBase.Inject(Object instance) in \Ninject\src\Core\KernelBase.cs:288
   Ninject.Framework.Web.KernelContainer.Inject(Object instance) in \Ninject\src\Framework\Web\KernelContainer.cs:69
   Ninject.Framework.Web.UserControlBase.RequestActivation() in \Ninject\src\Framework\Web\UserControlBase.cs:41
   Ninject.Framework.Web.UserControlBase.OnInit(EventArgs e) in \Ninject\src\Framework\Web\UserControlBase.cs:33
   System.Web.UI.Control.InitRecursive(Control namingContainer) +143
   System.Web.UI.Control.InitRecursive(Control namingContainer) +391
   System.Web.UI.Control.InitRecursive(Control namingContainer) +391
   System.Web.UI.Control.InitRecursive(Control namingContainer) +391
   System.Web.UI.Control.InitRecursive(Control namingContainer) +391
   System.Web.UI.Control.InitRecursive(Control namingContainer) +391
   System.Web.UI.Control.InitRecursive(Control namingContainer) +391
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1477

Answer 1

从堆栈跟踪中，我可以看到您使用的是某个Ninject 1.x.x版本。当前版本是2.2.1，您可以从nuget安装3.0.0版本的候选版本。不再维护第九对象1。

我建议更新到2.2.1或3.0.0。否则，你将不得不从github获取源代码，自己调试问题，并提供一个拉取请求来修复该问题。

Answer 2

我也遇到过类似的问题。在我的例子中，我在Mono上使用的是Nuget的Ninject 3.2.2.0包，不得不回滚到3.2.0.0，就像我从this ticket on the Ninject issue tracker上发现的那样。看起来像是Ninject通过反射在.Net中使用了一个未发布的API，而这在Mono中是不存在的。