Issues with Dependency Injection in ASP.NET Core: Scoped vs Transient Lifetimes
I'm not sure how to approach I'm working on a project and hit a roadblock... I'm encountering an unexpected behavior when trying to configure my services in an ASP.NET Core 6 application using Dependency Injection (DI). I have a service, `MyService`, that depends on another service, `MyDependency`, which I'm registering as transient. Here’s the registration in `Startup.cs`: ```csharp public void ConfigureServices(IServiceCollection services) { services.AddTransient<MyDependency>(); services.AddScoped<MyService>(); } ``` The issue arises when I inject `MyService` into a controller and call a method that uses `MyDependency`. I expect a new instance of `MyDependency` every time `MyService` is instantiated, but I'm experiencing unexpected singleton behavior where the state of `MyDependency` persists across different requests. Here’s a simplified version of my `MyService`: ```csharp public class MyService { private readonly MyDependency _myDependency; public MyService(MyDependency myDependency) { _myDependency = myDependency; } public string GetDependencyState() { return _myDependency.State; } } ``` And here’s the relevant part of `MyDependency`: ```csharp public class MyDependency { public string State { get; set; } = Guid.NewGuid().ToString(); } ``` When I make multiple requests to the controller method that accesses `GetDependencyState`, I see that the `State` value remains the same across requests instead of changing, which leads me to believe I’m not getting a new instance of `MyDependency` as expected. I’ve also verified that I’m not caching `MyService` inadvertently. I’ve tried switching `MyDependency` to scoped as well, but that only changed the scope of instances, not their behavior. What am I missing here with the DI configuration that could lead to this unexpected singleton-like behavior, and how can I ensure that `MyDependency` is truly transient in the context of `MyService`? This is part of a larger CLI tool I'm building. What am I doing wrong? Is there a better approach? I'm working in a Ubuntu 20.04 environment. Any suggestions would be helpful.