Dependency Injection Initialization

Question

Please note: I have just started using AutoFac to learn about DI and IoC.

Is dependency injection supposed to be initialized in the controllers constructor?

Ho

Answer 1

private IMyService iMyService;
public HomeController(IMyServices myService)
{
    iMyService = myService;
}  

in this case,you only care about what you need(IMyServices)

public IMyService iMyService = new MyService();  

but in this case,you care about what it will be(new MyService())

when design a class,you know what you need;
but what it will be,that not decided by you,that decided by who use your class