c# - StructureMap in multi-layer solution -

in solution have 3 projects: webapi, businesslayer , datalayer.

in webapi have structuremap configured use defaultregistry:

public class defaultregistry : registry  {     public defaultregistry()      {         scan(             scan => {                 scan.thecallingassembly();                 scan.withdefaultconventions();             });         for<business.interfaces.ibusinessclass>().use(ctx => new business.businessclass());         for<data.interfaces.idataclass>().use(ctx => new data.dataclass());                 } } 

a controller class in webapi looks this:

public class mycontroller : apicontroller {     private readonly ibusinessclass _businessclass;      public mycontroller(ibusinessclass businessclass)     {         _businessclass = businessclass;     }      public httpresponsemessage get(int id)     {         var success = _businessclass.dosomething();         return success ? request.createresponse(httpstatuscode.ok) :   request.createerrorresponse(httpstatuscode.badrequest, "error");      } } 

injecting dependency _businessclass in example works charm.

now let's take @ businessclass implementation:

public class businessclass : ibusinessclass {     private readonly idataclass _dataclass;      public businessclass(idataclass dataclass)     {         _dataclass = dataclass;     }      public void dosomething()     {         _dataclass.dosomethingwithdata();     } } 

in example dependency injection _dataclass doesn't work. dataclass param in constructor null _dataclass field isn't initialized properly. doing wrong? i'll add businessclass defined in businesslayer project , dataclass defined in datalayer projects (both of projects being class libraries).

in you're default registry registering default conventions calling

scan.withdefaultconventions();  

so these 2 calls redundant.

for<business.interfaces.ibusinessclass>().use(ctx => new business.businessclass()); for<data.interfaces.idataclass>().use(ctx => new data.dataclass());    

like kenneth said aren't scanning assembly businessclass located in.

public class defaultregistry : registry  {     public defaultregistry()      {         scan(             scan => {                 scan.thecallingassembly();                 scan.assemblycontainingtype<businessclass>();                 scan.withdefaultconventions();             });                 } }