MVC3, Ninject and Ninject.MVC3 problem - asp.net-mvc-3

Question

I just start using Ninject with MVC3 so here is my problem:
- I installed Ninject 2.2.1.4 and Ninject.MVC3 2.2.2.0 from Nuget
- In my WebUI (MVC3 project):
Global.asax.cs
public class MvcApplication : NinjectHttpApplication
{
public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
filters.Add(new HandleErrorAttribute());
}
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute(
"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { controller = "home", action = "index", id = UrlParameter.Optional } // Parameter defaults
);
}
protected override void OnApplicationStarted()
{
base.OnApplicationStarted();
AreaRegistration.RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
}
protected override IKernel CreateKernel()
{
var kernel = new StandardKernel();
kernel.Load(Assembly.GetExecutingAssembly());
return kernel;
}
}
In my Domain (class project), i have my LinQ to SQL datacontext, i want to load the context with the connection string from my Web.Config in my WebUI, so i have to pass the constructor parameter, i also have some services in my Domain project
public class LotteryDataService
{
LinQ.WebDataContext _context;
public LotteryDataService(LinQ.WebDataContext context)
{
_context = context;
}
public IEnumerable<LinQ.LotteryData> Get()
{
return _context.LotteryDatas.Take(10);
}
}
How to bind the datacontext with Ninject with constructor parameter (here is connection string)?

Answer 1

This is how you pass a constructor parameter. Ninject will resolve the constructor that matches the specified constructor arguments.
public class DataModule : NinjectModule
{
public override void Load()
{
string connectionString = "...";
Bind<WebDataContext>().ToSelf()
.WithConstructorArgument("connection", connectionString);
}
}
The first argument to .WithConstructorArgument() should be the name of the constructor parameter. This is fileOrServerOrConnection in the base class, but connection in derived class.

Answer 2

Below code snap might be helpful. Hope it will serve greater flexibility!
public class MvcModule : NinjectModule
{
//Bind the default connection string
public void BindDataContext()
{
ConstructorArgument parameter = new ConstructorArgument("connectionString", "[Config Value]");
Bind<DataContext>().ToSelf().InRequestScope().WithParameter(parameter);
}
public override void Load()
{
BindDataContext();
Bind(typeof(IRepository<>)).To(typeof(EntityRepository<>)).InRequestScope();
........
}
//Re-Bind the connection string (in case of multi-tenant architecture)
public void ReBindDataContext(string cn)
{
ConstructorArgument parameter = new ConstructorArgument("connectionString", cn);
Rebind<DataContext>().ToSelf().InRequestScope().WithParameter(parameter);
}
//Re-Bind the connection string (in case of multi-tenant architecture)
public static void ReBindDataContext(IKernal kernel,string cn)
{
IEnumerable<INinjectModule> ml = kernel.GetModules();
var myModule = ml.Where(i => i.Name.ToLowerInvariant().Contains("mvcmodule")).Select(i => i).Take(1);
MvcModule mm = myModule.ToList()[0] as MvcModule ;
mm.ReBindDataContext(cn);
}
//Return the module, for further modification like connection string
public static MvcModule GetModule(IKernal kernel)
{
IEnumerable<INinjectModule> ml = kernel.GetModules();
var myModule = ml.Where(i => i.Name.ToLowerInvariant().Contains("mvcmodule")).Select(i => i).Take(1);
MvcModule mm = myModule.ToList()[0] as MvcModule ;
return mm;
}
}