Getting class instance from other project

Question

I have a class library with a class like this:

public class GoogleSearch
{
    private IGoogleApiHelper _googleApiHelper;

    public GoogleSearch(IGoogleApiHelper googleApiHelper)
    {
        _googleApiHelper = googleApiHelper;
    }
    //some methods
}

googleApiHelper is a service got from IoC container of the library. Can I create an instance of GoogleSearch class from outside of library and make googleApiHelper service to be taken from IoC container?

Answer 1

googleApiHelper is a service got from IoC container of the library.

Prevent doing this. Libraries should not use a DI Container, only the start-up project should have a reference to the DI Container and should make all the required registration, including the types that are part of your library. For more information, read about the Composition Root .

If you follow the Composition Root pattern, you won't have any problems, since everything is composed in that single place.