CODEWITHSUNDEEP
c#asp.net-coredependency-injection
Craig
Craig

Reputation: 1776

How are you supposed to handle .net core service creation in terms of the dependency tree?

I am now using this in my register services section. The problem here is the my services have their own dependencies, and maybe those will have dependencies. I dont see how I can solve that problem with this. for instance my location service requires the http client, the logger and two different repositories. I was expecting that having already registered those 4 dependencies as services, this would sort of take care of itself. Any suggestion would be massively appreciated.

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        // db related
        var connectionString = Configuration.GetConnectionString("VoloDataBaseConnectionString");
        var dbContext = new DbContext(connectionString);
        services.AddSingleton<IDbContext>(dbContext);
        services.AddScoped(typeof(Repository<>), typeof(Repository<>));

        // utilities
        services.AddSingleton(new HttpClient());
        services.AddSingleton(new Logger(dbContext));

        // bll services
        services.AddSingleton(
            new LocationService(
                new HttpClient(),
                new Logger(dbContext),
                new Repository<Country>(dbContext),
                new Repository<Location>(dbContext)
            )
        );
    }

Upvotes: 1

Views: 248

Answers (1)

Steven
Steven

Reputation: 172646

I was expecting that having already registered those 4 dependencies as services, this would sort of take care of itself.

It will take care of itself. You just have to make use of the container's Auto-Wiring abilities:

services.AddScoped<LocationService>();

Do note that, to prevent Captive Dependencies, you should make sure that components do not depend on other components with a shorter lifestyle. For instance, do not let a Singleton component depend on a Scoped component. For that reason, LocationService should not be registered as Singleton, but rather as Scoped or Transient.

Upvotes: 1

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