C# (CSharp) IPurposeService примеры использования

Пример #1

 public PurposeController(IPurposeService _service)
 {
     service = _service;
 }

Пример #2

 public PurposeController(IPurposeService _purposeService, IHostingEnvironment _env)
 {
     purposeService = _purposeService;
     env            = _env;
 }