Use the current UserManager in another controller

Question

Hello I have 2 controllers:

• ApplicationUserController
• ApplicationProductController

How can I use ApplicationUserController _userManager to allow only [Authorize] requests inside ApplicationProductController . Everytime I attempt to register a new product as an authorized user I'm getting this error:

System.InvalidOperationException: Unable to resolve service for type 'MyAPI.Controllers.ApplicationUserController' while attempting to activate 'MyAPI.Controllers.ApplicationProductController'. at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, Boolean isDefaultParameterRequired) at lambda_method(Closure, IServiceProvider, Object[] ) at Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider.<>c__DisplayClass4_0.<CreateActivator>b__0(ControllerContext controllerContext) at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope) at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger) at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at AspNetCoreRateLimit.RateLimitMiddleware 1.Invoke(HttpContext context) at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

Answer 1

Make sure you have [Authorize] attribute above your Controller class to make users being authorized to access controller and methods, otherwise redirect them to login page.

I think you are trying to inject a controller (ApplicationUserController) in another controller (ApplicationProductController). It's wrong, remove the parameter from constructor.

You don't have to inject UserManager into into controller to make sure users are authorized to access controller.

This error is raised because you are trying to inject something into your controller which is not registered in Dependency Injection . Please check your constructor of ApplicationUserController and be sure that all parameters are registered in DI at Startup.cs file in root of your project.

You can find cause of error more easily by checking differences between ApplicationUserController constructor and ApplicationProductController constructor.

Hope this helps you.