asp.net web api - Dependency Injection for DataContracts and Models in the BLL -


apologies if has been asked before. unable find similar question or post.

i have solution unity di framework.

i have tried understand concept of tdd , di. should last question before move things real application.

i understand concept of injecting dependency via constructor, how bll looks now:

the bll class called carservice, 1 method getcardetails:

class carservice {    irepository repository;     carservice(irepository repository)    {       this.repository = repository;    }     carresponse getcardetails(carrequest request)    {        carresponse carresponse = new carresponse();         carmodel car = this.repository.selectcarbyid(request.carid);         if(car!=null)        {            carresponse.make = car.make;            carresponse.reg = car.reg;        }         return carresponse;     }  }

using composition root (cr) suggestion in this question using webapi project cr project. wanted projects referred in cr suggested in question , here

how ever in above example code, i'll need have reference datacontracts , model project in carservice do:

carresponse carresponse = new carresponse();  carmodel car = this.repository.selectcarbyid(request.carid);

and accept carrequest method parameter.

is okay that? (this mean datacontracts , model project not referenced cr carservice)

or should resolved sort of di technique. if so, how?

it fine have contracts , models being referenced service layer. should not using dependency injection them. contracts can shared between service layer , client calling service (if .net client of course).


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