C#•2mo ago

ASP.NET Dependency Injection Fails to instantiate service

I'm trying to inject a service over which I have no control (hence no use of an interface) and determine why the DI container cannot instantiate the service. This code applies:

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddScoped<Users>();
builder.Services.AddScoped<UsersRepository>();
...
class UsersRepository {
  CTSCore.Security.Users Users;
  public UsersRepository()
  {
      Users = new();
  }
}
...
public class LoginEndpoint: Endpoint<LogonRequest, Results<Ok<LoginResponse>, UnauthorizedHttpResult>>
{
    public UsersRepository? Repository { get; set; }
    UsersRepository? _repository;
    public LoginEndpoint(UsersRepository repository)
    {
        _repository = repository;
    }
}

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddScoped<Users>();
builder.Services.AddScoped<UsersRepository>();
...
class UsersRepository {
  CTSCore.Security.Users Users;
  public UsersRepository()
  {
      Users = new();
  }
}
...
public class LoginEndpoint: Endpoint<LogonRequest, Results<Ok<LoginResponse>, UnauthorizedHttpResult>>
{
    public UsersRepository? Repository { get; set; }
    UsersRepository? _repository;
    public LoginEndpoint(UsersRepository repository)
    {
        _repository = repository;
    }
}

UsersRepository doesn't get injected into LoginEndpoint when I rely on CTSCore.Security.Users being injected, but when I create in manually, the repo does get injected into the endpoint. I've tried using an Oakton environment check like this:

builder.Services.AddScoped<Users>();
...
public static void CheckServiceIsRegistered<T>(this IServiceCollection services)
{
    services.CheckEnvironment($"Service {typeof(T).FullName} should be registered", s => s.GetRequiredService<T>());
}

builder.Services.AddScoped<Users>();
...
public static void CheckServiceIsRegistered<T>(this IServiceCollection services)
{
    services.CheckEnvironment($"Service {typeof(T).FullName} should be registered", s => s.GetRequiredService<T>());
}

but this check fails when invoked. How can I determine why the container is not registering a CTSCore.Security.Users instance when I can easily do it myself?

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ASP.NET Dependency Injection Fails to instantiate service