I am using ASP.NET MVC 3 and Autofac for my dependency injection. I am using AutoMapper for my mapping.
I have an IMapper class that I use for all my model view mappings. So any any of my mapping classes can implement this interface. In the controller below the constructor receives an IMapper instance, and in my User controller it might receive a different instance, maybe userMapper. Getting back to the code below, I have a class called NewsMapper and it implements IMapper. How do I setup dependency injection so that this controller must receive an instance of NewsMapper? Please bear in mind that I might have another mapper called UserMapper.
I have the following controller:
public class NewsController
{
private INewsService newsService;
private IMapper newsMapper;
public NewsController(INewsService newsService, IMapper newsMapper)
{
if (newsService == null)
{
throw new ArgumentNullException("newsService");
}
if (newsMapper == null)
{
throw new ArgumentNullException("newsMapper");
}
this.newsService = newsService;
this.newsMapper = newsMapper;
}
}
I have the following configuration in my global.asax.cs:
var builder = new ContainerBuilder();
builder.RegisterControllers(Assembly.GetExecutingAssembly());
builder.RegisterType<NewsService>().As<INewsService>();
builder.RegisterType<NewsRepository>().As<INewsRepository>();
UPDATED:
My IMapper interface:
public interface IMapper
{
object Map(object source, Type sourceType, Type destinationType);
}
My NewsMapper class:
public class NewsMapper : IMapper
{
static NewsMapper()
{
Mapper.CreateMap<News, NewsViewModel>();
Mapper.CreateMap<NewsViewModel, News>();
}
public object Map(object source, Type sourceType, Type destinationType)
{
return Mapper.Map(source, sourceType, destinationType);
}
}
My controller action method where I do the mappings:
[HttpPost]
public ActionResult Create(NewsViewModel newsViewModel)
{
// Check model state
if (!ModelState.IsValid)
{
return View("Create", newsViewModel);
}
// Do mapping
var news = (News)newsMapper.Map(newsViewModel, typeof(NewsViewModel), typeof(News));
// Add to database via news service
// Redirect to list view
return RedirectToAction("List", "News");
}
The problem here is the broadness of the IMapper contract. It is too general - the NewsController wants to map something like News to NewsViewModel but IMapper just says "maps something to something."
Instead, have a look at creating a generic variant such as IMapper<TFrom,TTo>. Then, you can set up container so that the NewsController receives an IMapper<News,NewsModel> which is unambiguous and should uniquely match the NewsMapper component (however you decide to set that up.)
Edit
For examples/variants on the generic mapper theme see:
http://consultingblogs.emc.com/owainwragg/archive/2010/12/15/automapper-profiles.aspx
http://lucisferre.net/2009/12/31/graphite-update-the-automapfilter-for-model-e280933e-viewmodel-mapping/
Specifying a default Unity type mapping for a generic interface and class pair
Related
I am building the asp.net WebAPI project and have used Autofac as IOC. Now i am doing constructor based injection and calls the various methods of the business class from the controller class.
Now i want to pass some additional data into the business class via the public property IncomingUser such as this one :-
My interface looks like this :-
public interface IUserManager
{
string IncomingUser { set; get; }
Task<List<String>> GetUserPofiles(string Name);
}
This readonly property IncomingUser will be used inside various methods defined under the class UserManager.
public class UserManager : IUserManager
{
public string IncomingUser { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
public async Task<List<String>> GetUserPofiles(string Name)
{
......Business Logic for the method......
}
}
From the API controller, i am setting the DI like this :-
public class myAPIController : ApiController
{
IUserManager _Manager;
public myAPIController(IUserManager Mang)
{
_Manager = Mang;
}
}
Please suggest, how should i set the property IncomingUser from the API controller class with the help of autofac DI or another way.
I have a custom ASP.NET MVC controller that retrieves operations from the user service. I want to pass the operations property to the scenario service using dependency injection.
public abstract class BaseController : Controller {
protected IUserService userService;
public OperationWrapper operations { get; private set; }
public BaseController(IUserService userService) {
this.userService = userService;
this.operations = userService.GetOperations(HttpContext.Current.User.Identity.Name);
}
}
public abstract class ScenarioController : BaseController {
protected IScenarioService scenarioService;
public ScenarioController(IScenarioService scenarioService, IUserService userService)
: base(userService) {
this.scenarioService = scenarioService;
}
}
public class ScenarioService : IScenarioService {
private OperationWrapper operations;
public ScenarioService(OperationWrapper operations) {
this.repo = repo;
this.operations = operations;
}
}
Here is my Windsor installer.
public class Installer : IWindsorInstaller {
public void Install(IWindsorContainer container, IConfigurationStore store) {
container.Register(Classes.FromThisAssembly()
.BasedOn<IController>());
container.Register(Classes.FromThisAssembly()
.Where(x => x.Name.EndsWith("Service"))
.WithService.DefaultInterfaces()
.LifestyleTransient());
}
}
I pretty sure I've done something similar with Ninject a couple of years back. What do I need to add to the installer in order to make this work? Is it even possible?
There are a few of options here:
1. Use LifeStylePerWebRequest() and UsingFactoryMethod()
First, you could register an OperationWrapper as LifestylePerWebRequest() and inject it into both the BaseController and ScenarioService. Windsor will let you register the dependency with a factory method for creating it, which can in turn call other services which have been registered.
container.Register(Component.For<OperationWrapper>()
.LifestylePerWebRequest()
.UsingFactoryMethod(kernel =>
{
var userService = kernel.Resolve<IUserService>();
try
{
return userService.GetOperations(
HttpContext.Current.User.Identity.Name);
}
finally
{
kernel.ReleaseComponent(userService);
}
}));
So, every time Windsor is asked for an OperationWrapper, it will run that call against an instance if IUserService, giving it the Name of the current User. By binding the lifestyle to LifestylePerWebRequest(), you can verify that each request will get its own instance of the OperationWrapper and it won't bleed across requests.
(The only edge case you'd run into is one where a user becomes authenticated mid-request and the OperationWrapper needs to be adjusted as a result. If that's a normal-path use case, this may need some re-thinking.)
Then, modify your base controller to take that registered object in as a dependency:
public abstract class BaseController : Controller {
protected IUserService userService;
protected OperationWrapper operations;
public BaseController(IUserService userService, OperationWrapper operations) {
this.userService = userService;
this.operations = operations;
}
}
2. Use Method Injection
It looks like OperationWrapper is some sort of context object, and those can sometimes be injected into the method instead of into the constructor.
For instance, if your method was:
int GetTransactionId() { /* use OperationWrapper property */ }
You could just modify the signature to look like:
int GetTransactionId(OperationWrapper operations) { /* use arg */ }
In this situation, it makes sense to use it if a small-ish subset of your service's methods use that dependency. If the majority (or totality) of methods need it, then you should probably go a different route.
3. Don't use DI for OperationWrapper at all
In situations where you have a highly-stateful contextual object (which it seems like your OperationWrapper is), it frequently just makes sense to have a property whose value gets passed around. Since the object is based on some current thread state and is accessible from everywhere in any subclassed Controller, it may be right to just keep the pattern you have.
If you can't answer the question "What am I unable to do with OperationWrapper now that DI is going to solve for me?" with anything but "use the pattern/container," this may be the option for this particular situation.
You should set dependency resolver in Application_Start method of global.asax
System.Web.MVC.DependencyResolver.SetResolver(your windsor resolver)
Create a class that inherits from DefaultControllerFactory. Something like this will do:
public class WindsorControllerFactory : DefaultControllerFactory
{
public WindsorControllerFactory(IKernel kernel)
{
_kernel = kernel;
}
protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
{
if (controllerType == null)
{
throw new HttpException(
404,
String.Format(
CultureInfo.CurrentCulture,
"The controller for path '{0}' was not found or does not implement IController.",
requestContext.HttpContext.Request.Path
)
);
}
return (IController)_kernel.Resolve(controllerType);
}
public override void ReleaseController(IController controller)
{
Kernel.ReleaseComponent(controller);
}
private readonly IKernel _kernel;
private IKernel Kernel
{
get { return _kernel; }
}
}
In the Application_Start method of your MvcApplication class add the following:
var container = new WindsorContainer();
container.Install(FromAssembly.This());
ControllerBuilder.Current.SetControllerFactory(
new WindsorControllerFactory(container.Kernel)
);
This should work with your existing installer and get you to the point where Windsor will start resolving your dependencies for you. You might have to fill-in a few gaps, but you'll get the point.
I've borrowed heavily from: https://github.com/castleproject/Windsor/blob/master/docs/mvc-tutorial-intro.md
Be wary of using IDependencyResolver as it doesn't make provision for releasing what's resolved.
I have a controller and I want to use Dependency Injection with constructor,this is my code
private readonly IHomeService _iHomeService;
public HomeController(IHomeService iHomeService)
{
_iHomeService = iHomeService;
}
public HomeController()
{
}
When I remove Constructor without any parameter(Second Constructor),I see this error :
No parameterless constructor defined
and When I use Constructor without any parameter,I see my private field is null(_iHomeService = null) because program use constructor without parameter.
How can I resolve this problem for Dependency Injection?
Well, to do dependency injection youll need to either use a framework or use controller factory .
try ninject
public class HomeController : Controller
{
private readonly IWelcomeMessageService welcomeMessageService;
public HomeController(IWelcomeMessageService welcomeMessageService)
{
this.welcomeMessageService = welcomeMessageService;
}
public void Index()
{
ViewModel.Message = this.welcomeMessageService.TodaysWelcomeMessage;
return View();
}
}
public class WelcomeMessageServiceModule : NinjectModule
{
public override void Load()
{
this.Bind<IWelcomeMessageService>().To<WelcomeMessageService>();
}
}
The framework will take control on the controller instance creation and pass the constractor params
It sounds like you are expecting, automatically, the HomeService class to be instantiated and injected into the Controller.
Using an IoC framework like Ninject or StructureMap will do that for you - once you've set it up.
If you don't want to use an IoC framework, you'll need to manually instantiate the HomeService in your constructor.
ASP.NET uses a ControllerFactory to instantiate your controllers on-demand. This class requires that your controller has a parameterless constructor that it can use to create an instance of it.
You'll need to use a dependency injection framework to create your controllers and inject the required dependencies. ASP.NET has some dependency injection capability, but I understand that it is flawed. I suggest using Castle Windsor to manage your dependency injection. It integrates very well with ASP.NET, and there's a tutorial on integrating it here.
If you go down this route, you'd end up with an installer for your controllers and service:
public class Installer : IWindsorInstaller
{
public void Install(IWindsorContainer container, IConfigurationStore store)
{
container.Register(Classes.FromThisAssembly().BasedOn<IController>().LifestyleTransient());
container.Register(Component.For<IHomeService>.ImplementedBy<HomeService>());
}
}
..and a new ControllerFactory to create them:
public class WindsorControllerFactory : DefaultControllerFactory
{
private readonly IKernel _kernel;
public WindsorControllerFactory(IKernel kernel)
{
_kernel = kernel;
}
public override void ReleaseController(IController controller)
{
_kernel.ReleaseComponent(controller);
}
protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
{
if (controllerType == null)
{
throw new HttpException(404, string.Format("The controller for path '{0}' could not be found.", requestContext.HttpContext.Request.Path));
}
return (IController) _kernel.Resolve(controllerType);
}
}
Finally, you'd create a container and set a new controller factory:
var container = new WindsorContainer().Install(new Installer());
var controllerFactory = new WindsorControllerFactory(_container.Kernel);
ControllerBuilder.Current.SetControllerFactory(controllerFactory);
You could also use Ninject or StructureMap.
I'm using NInject with NInject.Web.Mvc.
To start with, I've created a simple test project in which I want an instance of IPostRepository to be shared between a controller and a custom model binder during the same web request. In my real project, I need this because I'm getting IEntityChangeTracker problems where I effectively have two repositories accessing the same object graph. So to keep my test project simple, I'm just trying to share a dummy repository.
The problem I'm having is that it works on the first request and that's it. The relevant code is below.
NInjectModule:
public class PostRepositoryModule : NinjectModule
{
public override void Load()
{
this.Bind<IPostRepository>().To<PostRepository>().InRequestScope();
}
}
CustomModelBinder:
public class CustomModelBinder : DefaultModelBinder
{
[Inject]
public IPostRepository repository { get; set; }
public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
repository.Add("Model binder...");
return base.BindModel(controllerContext, bindingContext);
}
}
public class HomeController : Controller
{
private IPostRepository repository;
public HomeController(IPostRepository repository)
{
this.repository = repository;
}
public ActionResult Index(string whatever)
{
repository.Add("Action...");
return View(repository.GetList());
}
}
Global.asax:
protected override void OnApplicationStarted()
{
AreaRegistration.RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
ModelBinders.Binders.Add(typeof(string), kernel.Get<CustomModelBinder>());
}
Doing it this way is actually creating 2 separate instances of IPostRepository rather than the shared instance. There's something here that I'm missing with regards to injecting a dependency into my model binder. My code above is based on the first setup method described in the NInject.Web.Mvc wiki but I have tried both.
When I did use the second method, IPostRepository would be shared only for the very first web request, after which it would default to not sharing the instance. However, when I did get that working, I was using the default DependencyResolver as I couldn't for the life of me figure out how to do the same with NInject (being as the kernel is tucked away in the NInjectMVC3 class). I did that like so:
ModelBinders.Binders.Add(typeof(string),
DependencyResolver.Current.GetService<CustomModelBinder>());
I suspect the reason this worked the first time only is because this isn't resolving it via NInject, so the lifecycle is really being handled by MVC directly (although that means I have no idea how it's resolving the dependency).
So how do I go about properly registering my model binder and getting NInject to inject the dependency?
The ModelBinders are reused by MVC for multiple requests. This means they have a longer lifecycle than request scope and therefore aren't allowed to depend on objects with the shorter request scope life cycle.
Use a Factory instead to create the IPostRepository for every execution of BindModel
It's actually really simple to get the Ninject factory extension up and running, but that wasn't clear to me from the existing answers.
The factory extensions plugin is a prerequisite, which can be installed via NUGet:
Install-Package Ninject.Extensions.Factory
You just need the factory injected into your model binder somewhere, eg:
private IPostRepositoryFactory _factory;
public CustomModelBinder(IPostRepositoryFactory factory) {
_factory = factory;
}
Then create an interface for the factory. The name of the factory and the name of the method doesn't actually matter at all, just the return type. (Good to know if you want to inject an NHibernate session but don't want to have to worry about referencing the correct namespace for ISessionFactory, also useful to know if GetCurrentRepository makes what it actually does more clear in context):
public interface IPostRepositoryFactory {
IPostRepository CreatePostRepository();
}
Then, assuming your IPostRepository is already being managed by Ninject correctly, the extension will do everything else for you just by calling the .ToFactory() method.
kernel.Bind<IPostRepository().To<PostRepository>();
kernel.Bind<IPostRepositoryFactory>().ToFactory();
Then you just call your factory method in the code where you need it:
var repo = _factory.CreatePostRepository();
repo.DoStuff();
(Update: Apparently naming your factory function GetXXX will actually fail if the service doesn't already exist in the session. So you do actually have to be somewhat careful with what you name the method.)
I eventually managed to solve it with a factory as suggested. However, I just could not figure out how to accomplish this with Ninject.Extensions.Factory which is what I would've preferred. Here is what I ended up with:
The factory interface:
public interface IPostRepositoryFactory
{
IPostRepository CreatePostRepository();
}
The factory implementation:
public class PostRepositoryFactory : IPostRepositoryFactory
{
private readonly string key = "PostRepository";
public IPostRepository CreatePostRepository()
{
IPostRepository repository;
if (HttpContext.Current.Items[key] == null)
{
repository = new PostRepository();
HttpContext.Current.Items.Add(key, repository);
}
else
{
repository = HttpContext.Current.Items[key] as PostRepository;
}
return repository;
}
}
The Ninject module for the factory:
public class PostRepositoryFactoryModule : NinjectModule
{
public override void Load()
{
this.Bind<IPostRepositoryFactory>().To<PostRepositoryFactory>();
}
}
The custom model binder:
public class CustomModelBinder : DefaultModelBinder
{
private IPostRepositoryFactory factory;
public CustomModelBinder(IPostRepositoryFactory factory)
{
this.factory = factory;
}
public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
IPostRepository repository = factory.CreatePostRepository();
repository.Add("Model binder");
return base.BindModel(controllerContext, bindingContext);
}
}
The controller:
public class HomeController : Controller
{
private IPostRepository repository;
public HomeController(IPostRepositoryFactory factory)
{
this.repository = factory.CreatePostRepository();
}
public ActionResult Index(string whatever)
{
repository.Add("Action method");
return View(repository.GetList());
}
}
Global.asax to wire up the custom model binder:
protected override void OnApplicationStarted()
{
AreaRegistration.RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
ModelBinders.Binders.Add(typeof(string), kernel.Get<CustomModelBinder>());
}
Which in my view, gave me the desired output of:
Model binder
Action method
In a MVC3-application with Ninject.MVC 2.2.0.3 (after merge), instead of injecting repostories directly into controllers I'm trying to make a service-layer that contain the businesslogic and inject the repostories there. I pass the ninject-DependencyResolver to the service-layer as a dynamic object (since I don't want to reference mvc nor ninject there). Then I call GetService on it to get repositories with the bindings and lifetimes I specify in NinjectHttpApplicationModule. EDIT: In short, it failed.
How can the IoC-container be passed to the service-layer in this case? (Different approaches are also very welcome.)
EDIT: Here is an example to illustrate how I understand the answer and comments.
I should avoid the service locator (anti-)pattern and instead use dependency injection. So lets say I want to create an admin-site for Products and Categories in Northwind. I create models, repositories, services, controllers and views according to the table-definitions. The services call directly to the repositories at this point, no logic there. I have pillars of functionality and the views show raw data. These bindings are configured for NinjectMVC3:
private static void RegisterServices(IKernel kernel)
{
kernel.Bind<ICategoryRepository>().To<CategoryRepository>();
kernel.Bind<IProductRepository>().To<ProductRepository>();
}
Repository-instances are created by ninject via two layers of constructor injection, in the ProductController:
private readonly ProductsService _productsService;
public ProductController(ProductsService productsService)
{
// Trimmed for this post: nullchecks with throw ArgumentNullException
_productsService = productsService;
}
and ProductsService:
protected readonly IProductRepository _productRepository;
public ProductsService(IProductRepository productRepository)
{
_productRepository = productRepository;
}
I have no need to decouple the services for now but have prepared for mocking the db.
To show a dropdown of categories in Product/Edit I make a ViewModel that holds the categories in addition to the Product:
public class ProductViewModel
{
public Product Product { get; set; }
public IEnumerable<Category> Categories { get; set; }
}
The ProductsService now needs a CategoriesRepository to create it.
private readonly ICategoryRepository _categoryRepository;
// Changed constructor to take the additional repository
public ProductsServiceEx(IProductRepository productRepository,
ICategoryRepository categoryRepository)
{
_productRepository = productRepository;
_categoryRepository = categoryRepository;
}
public ProductViewModel GetProductViewModel(int id)
{
return new ProductViewModel
{
Product = _productRepository.GetById(id),
Categories = _categoryRepository.GetAll().ToArray(),
};
}
I change the GET Edit-action to return View(_productsService.GetProductViewModel(id)); and the Edit-view to show a dropdown:
#model Northwind.BLL.ProductViewModel
...
#Html.DropDownListFor(pvm => pvm.Product.CategoryId, Model.Categories
.Select(c => new SelectListItem{Text = c.Name, Value = c.Id.ToString(), Selected = c.Id == Model.Product.CategoryId}))
One small problem with this, and the reason I went astray with Service Locator, is that none of the other action-methods in ProductController need the categories-repository. I feel it's a waste and not logical to create it unless needed. Am I missing something?
You don't need to pass the object around you can do something like this
// global.aspx
protected void Application_Start()
{
// Hook our DI stuff when application starts
SetupDependencyInjection();
}
public void SetupDependencyInjection()
{
// Tell ASP.NET MVC 3 to use our Ninject DI Container
DependencyResolver.SetResolver(new NinjectDependencyResolver(CreateKernel()));
}
protected IKernel CreateKernel()
{
var modules = new INinjectModule[]
{
new NhibernateModule(),
new ServiceModule(),
new RepoModule()
};
return new StandardKernel(modules);
}
So in this one I setup all the ninject stuff. I make a kernal with 3 files to split up all my binding so it is easy to find.
In my service layer class you just pass in the interfaces you want. This service class is in it's own project folder where I keep all my service layer classes and has no reference to the ninject library.
// service.cs
private readonly IRepo repo;
// constructor
public Service(IRepo repo)
{
this.repo = repo;
}
This is how my ServiceModule looks like(what is created in the global.aspx)
// ServiceModule()
public class ServiceModule : NinjectModule
{
public override void Load()
{
Bind<IRepo>().To<Repo>();
}
}
Seee how I bind the interface to the repo. Now every time it see that interface it will automatically bind the the Repo class to it. So you don't need to pass the object around or anything.
You don't need worry about importing .dll into your service layer. For instance I have my service classes in their own project file and everything you see above(expect the service class of course) is in my webui project(where my views and global.aspx is).
Ninject does not care if the service is in a different project since I guess it is being referenced in the webui project.
Edit
Forgot to give you the NinjectDependecyResolver
public class NinjectDependencyResolver : IDependencyResolver
{
private readonly IResolutionRoot resolutionRoot;
public NinjectDependencyResolver(IResolutionRoot kernel)
{
resolutionRoot = kernel;
}
public object GetService(Type serviceType)
{
return resolutionRoot.TryGet(serviceType);
}
public IEnumerable<object> GetServices(Type serviceType)
{
return resolutionRoot.GetAll(serviceType);
}
}