Autofac DependencyResolutionException

Question

我收到以下错误：

Autofac.Core.DependencyResolutionException: An exception was thrown while invoking the constructor 'Void .ctor(System.String, Int32)' on type 'AerospikeClient'.

以下是 autofac 的堆栈跟踪：

at Autofac.Core.Activators.Reflection.BoundConstructor.Instantiate()
at Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable1 parameters) at Autofac.Core.Activators.Reflection.ReflectionActivator.<ConfigurePipeline>b__11_0(ResolveRequestContext ctxt, Action1 next) at Autofac.Core.Resolving.Middleware.DelegateMiddleware.Execute(ResolveRequestContext context, Action1 next) at Autofac.Core.Resolving.Pipeline.ResolvePipelineBuilder.<>c__DisplayClass14_0.<BuildPipeline>b__1(ResolveRequestContext ctxt) at Autofac.Core.Resolving.Middleware.DisposalTrackingMiddleware.Execute(ResolveRequestContext context, Action1 next) at Autofac.Core.Resolving.Pipeline.ResolvePipelineBuilder.<>c__DisplayClass14_0.b__1(ResolveRequestContext ctxt) at Autofac.Core.Resolving.Middleware.ActivatorErrorHandlingMiddleware.Execute(ResolveRequestContext context, Action1 next) --- End of inner exception stack trace --- at Autofac.Core.Resolving.Middleware.ActivatorErrorHandlingMiddleware.Execute(ResolveRequestContext context, Action1 next) at Autofac.Core.Resolving.Pipeline.ResolvePipelineBuilder.<>c__DisplayClass14_0.b__1(ResolveRequestContext ctxt) at Autofac.Core.Pipeline.ResolvePipeline.Invoke(ResolveRequestContext ctxt) at Autofac.Core.Resolving.Middleware.RegistrationPipelineInvokeMiddleware.Execute(ResolveRequestContext context, Action1 next) at Autofac.Core.Resolving.Pipeline.ResolvePipelineBuilder.<>c__DisplayClass14_0.<BuildPipeline>b__1(ResolveRequestContext ctxt) at Autofac.Core.Resolving.Middleware.SharingMiddleware.Execute(ResolveRequestContext context, Action1 next) at Autofac.Core.Resolving.Pipeline.ResolvePipelineBuilder.<>c__DisplayClass14_0.b__1(ResolveRequestContext ctxt) at Autofac.Core.Resolving.Middleware.ScopeSelectionMiddleware.Execute(ResolveRequestContext context, Action1 next) at Autofac.Core.Resolving.Pipeline.ResolvePipelineBuilder.<>c__DisplayClass14_0.<BuildPipeline>b__1(ResolveRequestContext ctxt) at Autofac.Core.Resolving.Middleware.CircularDependencyDetectorMiddleware.Execute(ResolveRequestContext context, Action1 next) at Autofac.Core.Resolving.Pipeline.ResolvePipelineBuilder.<>c__DisplayClass14_0.b__1(ResolveRequestContext ctxt) at Autofac.Core.Pipeline.ResolvePipeline.Invoke(ResolveRequestContext ctxt) at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, ResolveRequest request) at Autofac.Core.Resolving.ResolveOperation.ExecuteOperation(ResolveRequest request) at Autofac.Core.Resolving.ResolveOperation.Execute(ResolveRequest request) at Autofac.Core.Lifetime.LifetimeScope.ResolveComponent(ResolveRequest request) at Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable1 parameters, Object& instance) at Autofac.ResolutionExtensions.ResolveOptionalService(IComponentContext context, Service service, IEnumerable1 parameters) at Autofac.ResolutionExtensions.ResolveOptional(IComponentContext context, Type serviceType, IEnumerable`1 parameters) at Autofac.ResolutionExtensions.ResolveOptional(IComponentContext context, Type serviceType) at Autofac.Extensions.DependencyInjection.AutofacServiceProvider.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, Boolean isDefaultParameterRequired)

以下是我的报名信息：

builder.RegisterType<AerospikeClient>().As<IAerospikeClient>()
                .WithParameter("hostname", _configuration["AerospikeHostName"])
                .WithParameter("port", int.Parse(_configuration["AerospikePort"]))
                .SingleInstance();

_configuration 正在传递到我的 autofac 模块，它的类型是 IConfigurationRoot。我这样做是为了可以从外部传递值。

如果我把上面的注册改成：

builder.RegisterType<AerospikeClient>().As<IAerospikeClient>()
                .WithParameter("hostname", "172.27.159.44")
                .WithParameter("port", 3000)
                .SingleInstance();

然后它开始工作。但是我不想像那样硬编码我的价值观。然后我失去了根据不同环境覆盖它们的机会。

我做错了什么？

Answer 1

检查从 _configuration["AerospikeHostName"] 返回的实际类型。它实际上是 string，还是恰好可以分配给字符串的东西？

同样地，检查使用的实际值是否有效，因为 Autofac 应该可以预期该字符串值。

此外，将来考虑使用内置 diagnostics 来更清楚地了解解析操作期间抛出的异常。

Autofac DependencyResolutionException

Autofac DependencyResolutionException

autofac

aerospike

asp.net-core