Autofac DependencyResolutionException

Viewed 2010

I am getting following error:

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

Following is the stacktrace of autofac:

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)

Following is my registration:

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

_configuration is getting passed to my autofac module and it is of type IConfigurationRoot. I am doing this so that I can pass values from outside.

If I change the above registration to:

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

then it starts working. However I don't want to hardcode my values like that. Then I lose my chance of overriding them based on different environments.

What am I doing wrong here?

1 Answers

Check the actual type returned from _configuration["AerospikeHostName"]. Is it actually string, or is it something that happens to be assignable to string?

Equally, check the actual value used is valid, because Autofac should be fine expecting that string value.

Also, in future, consider using the built-in diagnostics to get a clearer picture of what exceptions are being thrown during resolve operations.

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