CODEWITHSUNDEEP
c#asp.net-coreasp.net-core-mvc.net-core
Tornike Choladze
Tornike Choladze

Reputation: 304

.Net Core Dependency Injection inject out of constructor

I need to inject out of constructor, everything I declared in Setup.

Ho can I do it ? How can I inject services out of constructor ? Something like Injector service in Angular 2.

INJECT SERVICES WITHOUT CONSTRUCTOR IN CONTROLLERS

something like this 

    public class ControllerBase : Controller
    {
        protected IRepository<Test> _test;
        protected IRepository<Test1> _test1;
        protected IRepository<Test2> _test2;

        public ControllerBase(INJECTOR injector)
        {
            _test = injector.inject(IRepository<Test>);
            _test1 = injector.inject(IRepository<Test1>);
            _test2 = injector.inject(IRepository<Test2>);
        }
    }

    public class SomeController : ControllerBase
    {
        public SomeController(INJECTOR injector)
            : base(injector)
        {

        }
    }

THANKS FOR ANSWER @Rick van den Bosch

FOR THOSE WHO STILL CAN'T GET WHAT I WANTED:

public class ControllerBase : Controller
{
    protected IRepository<Test> _test;
    protected IRepository<Test1> _test1;
    protected IRepository<Test2> _test2;

    public ControllerBase(IServiceProvider injector)
    {
        _test = injector.GetService<IRepository<Test>>();
        _test1 = injector.GetService<IRepository<Test1>>();
        _test2 = injector.GetService<IRepository<Test2>>();
    }
}

public class SomeController : ControllerBase
{
    public SomeController(IServiceProvider injector)
        : base(injector)
    {
        //HERE I HAVE ALL 3 REPO NOW WITHOUT EXTRA LINES
    }
}
public class SomeController1 : ControllerBase
{
    public SomeController1(IServiceProvider injector)
        : base(injector)
    {
        //HERE I HAVE ALL 3 REPO NOW WITHOUT EXTRA LINES
    }
}

Upvotes: 13

Views: 26058

Answers (1)

rickvdbosch
rickvdbosch

Reputation: 15621

You can inject the service as a parameter to the action method. This is done by marking the parameter with the attribute [FromServices].

This looks something like this:

public IActionResult About([FromServices] IDateProvider dateProvider)
{
    ViewData["Message"] = $"Current date is {dateProvider.CurrentDate}";

    return View();
}

If you're looking for default services in a BaseController: you could go about that several ways:

1. Still use a constructor
This would look something like this:

public class HomeController : BaseController
{
    public HomeController(IDateProvider dateProvider) : base(dateProvider)
    {
    }
}

and

public class BaseController
{
    protected IDateProvider _dateProvider;

    protected BaseController(IDateProvider dateProvider)
    {
        _dateProvider = dateProvider;
    }
}

This way the IDateProvider is available to both the BaseController and all inheriting Controllers.

2. Resolve services manually
This way you resolve the service manually. This could be in the BaseController, and only when you need them (lazy). For more info, see this post.

For simplicity and readability I would probably choose the constructor one.

Upvotes: 6

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