Installed Unity bootstrapper for ASP.NET Web API - An error occurred when trying to create a controller of type 'AccountController'

Question

I previously used Unity dependency injection from the tutorial Dependency Injection in ASP.NET Web API 2.

However I wanted to use HierarchicalLifetimeManager so I installed Unity bootstrapper for ASP.NET Web API.

However this gave me an error I did not previously have in AccountController. From what I can tell it has something to do with the IUserStore but what I don't understand is why this error occurs after installing this NuGet. Unity has been installed and used before and I did not have to register types for AccountController.

UnityConfig.cs:

public static void RegisterTypes(IUnityContainer container)
{
    container.RegisterType<DbContext>(new HierarchicalLifetimeManager());

    container.RegisterType<IArticleRepository, ArticleRepository>(new HierarchicalLifetimeManager());
    container.RegisterType<ISupplierRepository, SupplierRepository>(new HierarchicalLifetimeManager());
    container.RegisterType<IContactRepository, ContactRepository>(new HierarchicalLifetimeManager());
    container.RegisterType<ICampaignRepository, CampaignRepository>(new HierarchicalLifetimeManager());
}

{"Message":"An error has occurred.","ExceptionMessage":"An error occurred when trying to create a controller of type 'AccountController'. Make sure that the controller has a parameterless public constructor.","ExceptionType":"System.InvalidOperationException","StackTrace":" at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)\r\n at System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(HttpRequestMessage request)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext()","InnerException":{"Message":"An error has occurred.","ExceptionMessage":"Resolution of the dependency failed, type = \"Project.Sales.Web.Controllers.AccountController\", name = \"(none)\".\r\nException occurred while: while resolving.\r\nException is: InvalidOperationException - The current type, Microsoft.AspNet.Identity.IUserStore`2[HiQ.Repository.EntityFramework.Identity.BaseApplicationUser,System.Int32], is an interface and cannot be constructed. Are you missing a type mapping?\r\n-----------------------------------------------\r\nAt the time of the exception, the container was:\r\n\r\n Resolving Project.Sales.Web.Controllers.AccountController,(none)\r\n Resolving parameter \"userManager\" of constructor Project.Sales.Web.Controllers.AccountController(Project.Sales.Web.ApplicationUserManager userManager, Microsoft.Owin.Security.ISecureDataFormat`1[[Microsoft.Owin.Security.AuthenticationTicket, Microsoft.Owin.Security, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]] accessTokenFormat)\r\n Resolving Project.Sales.Web.ApplicationUserManager,(none)\r\n Resolving parameter \"store\" of constructor Project.Sales.Web.ApplicationUserManager(Microsoft.AspNet.Identity.IUserStore`2[[HiQ.Repository.EntityFramework.Identity.BaseApplicationUser, HiQ.Repository.EntityFramework, Version=0.1.2.0, Culture=neutral, PublicKeyToken=null],[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] store)\r\n Resolving Microsoft.AspNet.Identity.IUserStore`2[HiQ.Repository.EntityFramework.Identity.BaseApplicationUser,System.Int32],(none)\r\n","ExceptionType":"Microsoft.Practices.Unity.ResolutionFailedException","StackTrace":" at Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name, IEnumerable`1 resolverOverrides)\r\n at Microsoft.Practices.Unity.UnityContainer.Resolve(Type t, String name, ResolverOverride[] resolverOverrides)\r\n at Microsoft.Practices.Unity.UnityContainerExtensions.Resolve(IUnityContainer container, Type t, ResolverOverride[] overrides)\r\n at Microsoft.Practices.Unity.WebApi.UnityDependencyResolver.SharedDependencyScope.GetService(Type serviceType)\r\n at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(HttpRequestMessage request, Type controllerType, Func`1& activator)\r\n at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)","InnerException":{"Message":"An error has occurred.","ExceptionMessage":"The current type, Microsoft.AspNet.Identity.IUserStore`2[HiQ.Repository.EntityFramework.Identity.BaseApplicationUser,System.Int32], is an interface and cannot be constructed. Are you missing a type mapping?","ExceptionType":"System.InvalidOperationException","StackTrace":" at Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.ThrowForAttemptingToConstructInterface(IBuilderContext context)\r\n at lambda_method(Closure , IBuilderContext )\r\n at Microsoft.Practices.ObjectBuilder2.DynamicBuildPlanGenerationContext.<>c__DisplayClass1.b__0(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.BuilderContext.NewBuildUp(NamedTypeBuildKey newBuildKey)\r\n at Microsoft.Practices.Unity.ObjectBuilder.NamedTypeDependencyResolverPolicy.Resolve(IBuilderContext context)\r\n at lambda_method(Closure , IBuilderContext )\r\n at Microsoft.Practices.ObjectBuilder2.DynamicBuildPlanGenerationContext.<>c__DisplayClass1.b__0(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.BuilderContext.NewBuildUp(NamedTypeBuildKey newBuildKey)\r\n at Microsoft.Practices.Unity.ObjectBuilder.NamedTypeDependencyResolverPolicy.Resolve(IBuilderContext context)\r\n at lambda_method(Closure , IBuilderContext )\r\n at Microsoft.Practices.ObjectBuilder2.DynamicBuildPlanGenerationContext.<>c__DisplayClass1.b__0(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context)\r\n at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context)\r\n at Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name, IEnumerable`1 resolverOverrides)"}}}

if the AccountController receives a parameter of type IUserStore then you will have to register a implementation for this type too, or the unity will not be able to make an instance of the controller. — meJustAndrew
– meJustAndrew, Commented Jul 12, 2017 at 7:23
Please stop using Unity for new projects. Unity is dead github.com/unitycontainer/unity/issues. There will be no more releases for Unity. No bug fixes. No support. — NightOwl888
– NightOwl888, Commented Jul 12, 2017 at 16:45
@Ogglas - Pick one of the ~35 other ones. If you want something officially supported from MS, there is Microsoft.Extensions.DependencyInjection, but I can't attest to how good it is. — NightOwl888
– NightOwl888, Commented Jul 15, 2017 at 14:03

Ogglas · Accepted Answer · 2017-07-12 07:59:57Z

1

Original problem for this was that Unity tried to call the constructor with two parameters:

public AccountController(ApplicationUserManager userManager,
    ISecureDataFormat<AuthenticationTicket> accessTokenFormat)
{
    UserManager = userManager;
    AccessTokenFormat = accessTokenFormat;
}

By adding the following line telling Unity to call the parameterless constructor everything worked again.

container.RegisterType<AccountController>(new InjectionConstructor());

answered Jul 12, 2017 at 7:59

Ogglas

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