How to resolve 'InvalidOperationException' when using Dependency Injection with ASP.NET Core 6 and Scopes?
I'm currently facing an `InvalidOperationException` when trying to resolve a service from the service provider in my ASP.NET Core 6 application. The exception message indicates that the service is not registered in the service container. Here's the scenario: I have a service `MyService` that gets injected into a controller. The `MyService` class depends on another service `DependencyService`, which is registered with a scoped lifetime. My setup in `Startup.cs` looks like this: ```csharp public void ConfigureServices(IServiceCollection services) { services.AddScoped<DependencyService>(); services.AddScoped<MyService>(); services.AddControllers(); } ``` In the `MyController`, I'm injecting `MyService` like so: ```csharp [ApiController] [Route("api/[controller]")] public class MyController : ControllerBase { private readonly MyService _myService; public MyController(MyService myService) { _myService = myService; } } ``` However, when I attempt to invoke an action within the controller that uses `_myService`, I encounter the following error: ``` InvalidOperationException: Unable to resolve service for type 'DependencyService' while attempting to activate 'MyService'. ``` I’ve ensured that `DependencyService` is registered correctly. I also tried moving the registration into different scopes like singleton, but that resulted in other issues related to scoped services being disposed prematurely. I've checked if there are any issues with circular dependencies and verified that the constructors of both classes are simple and straightforward without complex logic. I also confirmed that I'm using the correct version of ASP.NET Core (`6.0.1`) and the project builds without warnings or errors. I've looked into the potential causes of this issue, including lifecycle mismanagement, but nothing seems to resolve it. What am I missing here, or how can I troubleshoot this more effectively?