Ninject 空引用异常

Question

我对 Ninject 完全陌生，看到了一个异常，不知道该怎么办。有人可以帮忙吗：-

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

我有类似的问题。就我而言，我在 Mono 上使用 Nuget 的 Ninject 3.2.2.0 包，并且必须回滚到 3.2.0.0，正如我从 Ninject 问题跟踪器上的此票。看起来 Ninject 通过反射使用了 .Net 中未发布的 API，而 Mono 中不存在这一点。

Answer 2

从堆栈跟踪中我可以看到您正在使用一些 Ninject 1.xx 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。 Ninject 1 不再维护。

我建议更新到 2.2.1 或 3.0.0。否则，您将必须从 github 获取源代码并自行调试问题并提供拉取请求来解决问题。