What's the correct way to instantiate an IRepository class from the Controller?
I have the following project layout:
MVC UI
|...CustomerController (ICustomerRepository - how do I instantiate this?)
Data Model
|...ICustomerRepository
DAL (Separate Data access layer, references Data Model to get the IxRepositories)
|...CustomerRepository (inherits ICustomerRepository)
What's the correct way to say ICustomerRepository repository = new CustomerRepository();
when the Controller has no visibility to the DAL proje开发者_C百科ct? Or am I doing this completely wrong?
You could use an IoC container to resolve the mapping for you by registering your own controller factory that allows the container to resolve the controllers - the container will resolve the controller type and inject a concrete instance of the interface.
Example using Castle Windsor
in global.asax in your MvcApplication
class:
protected void Application_Start()
{
RegisterRoutes(RouteTable.Routes);
ControllerBuilder.Current.SetControllerFactory(new WindsorControllerFactory());
}
WindsorControllerFactory
class
using System;
using System.Linq;
using System.Reflection;
using System.Web.Mvc;
using System.Web.Routing;
using Castle.Core.Resource;
using Castle.Windsor;
using Castle.Windsor.Configuration.Interpreters;
public class WindsorControllerFactory : DefaultControllerFactory
{
WindsorContainer container;
public WindsorControllerFactory()
{
container = new WindsorContainer(new XmlInterpreter(new ConfigResource("castle")));
var controllerTypes = from t in Assembly.GetExecutingAssembly().GetTypes()
where typeof(IController).IsAssignableFrom(t)
select t;
foreach (Type t in controllerTypes)
container.AddComponentWithLifestyle(t.FullName, t, Castle.Core.LifestyleType.Transient);
}
protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
{
// see http://stackoverflow.com/questions/1357485/asp-net-mvc2-preview-1-are-there-any-breaking-changes/1601706#1601706
if (controllerType == null) { return null; }
return (IController)container.Resolve(controllerType);
}
}
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