how do i consume model in BL to controller MVC - asp.net-mvc

Question

I am implementing loosely coupled architecture.
MVC as Presentation layer(ProjectName.Web) and all the Business Logic will be handled in a seperate C# project ProjectName.BL.
I will be consuming the webservice from my BL layer(ProjectName.BL). So the requestparameter class objects will be visible to BL since i am making servicereference.
1) The issue i am facing is how will i send my request parameter from Controller to BL layer.
2) Next issue is how will map the ViewModel objects in BL once i get response from service, as the viewmodels are in my web projects.
Request your assistance i have no clue to achieve this one.

Answer 1

This is like any other question on layering and separation of concerns.
Use a DTO. In your Business Layer, introduce types for performing the action you want to perform, and perform mapping between types.
Your question isn't quite concrete, so I'll go with Foo:
Service Layer:
public class ServiceFooRequest
{
public int ID { get; set; }
}
public class ServiceFooResponse
{
public string Bar { get; set; }
}
public ServiceFooResponse GetFoo(ServiceFooRequest request)
{
return new ServiceFooResponse
{
Bar = "Baz"
};
}
Business Layer:
public class BLFooResponse
{
public string Bar { get; set; }
}
public class BLL
{
public BLFooResponse GetFoo(int id)
{
var serviceResponse = _serviceReferenceClient.GetFoo(new ServiceFooRequest
{
ID = id
});
return new BLFooResponse
{
Bar = serviceResponse.Bar
};
}
}
MVC:
public class FooViewModel
{
public string Bar { get; set; }
}
public ActionResult GetFoo(int id)
{
var businessFooResponse = _bll.GetFoo(id);
var fooViewModel = new FooViewModel
{
Bar = businessFooResponse.Bar
};
return View(fooViewModel);
}

Answer 2

You need separate project (DLL) Models. It will store shared between layers models.
Each controller should have reference to BL object or BLL factory.
Hint - use Automapper to copy DAO objects to BDO.
Web project
public class FoodController : BaseController
{
private IFoodBll _foodBll = null;
public FoodController(IFoodBll foodBll)
{
// Make DI of your BLL
_foodBll = foodBll;
}
[HttpPost]
public ActionResult Edit(FoodEditModel model)
{
_foodBll.Save(model);
}
Your Edit.cshtml should look smth like this
#model MyProjects.Web.Models.Foods.FoodEditModel
#Html.HiddenFor(x => Model.Id)
#Html.EditorFor(x => Model.Name)