Using Ninject and Ninject.Extensions.Conventions with referenced assemblies

Question

I'm trying to get Ninject set up with an ASP.NET MVC 4 project.

I have 3 projects in my solution. The main MVC 4 web app, that has references to 2 supporting assemblies (My.Services.dll and My.Repository.dll). My.Services.dll also has a reference to My.Repository.dll.

I have added the Nuget packages: Ninject.MVC3 (version 3.0.0.6) and Ninject.Extensions.Conventions (version 3.0.0.11)

In the main web application I have a Home controller with the following constructor

public HomeController(IMyService myService)
{
    _myService = myService;
}

The service has a constructor like so:

public MyService(IMyRepository myRepository)
{
    _myRepository = myRepository;
}

In my NinjectWebCommon file I have:

private static void RegisterServices(IKernel kernel)
        {
            kernel.Bind(x =>
            {
                x.FromThisAssembly().SelectAllClasses().BindDefaultInterface();
                //x.FromAssemblyContaining<MyRepository>().SelectAllClasses().BindDefaultInterface();
                //x.FromAssemblyContaining<MyService>().SelectAllClasses().BindDefaultInterface();
                x.From("My.Repository", "My.Services").SelectAllTypes().BindDefaultInterface();

            });
        }

If I run the application I get an error ("Value cannot be null.\r\nParameter name: first") on the last line of the RegisterServices method.

You can see in the code that I've also tried x.FromAssemblyContaining<MyRepository>().SelectAllClasses().BindDefaultInterface() to no avail.

Incidentally, If I put the 2 types, MyService and MyRepository in the web application and not in the satellite assemblies and remove the last line of RegisterServices then all dependencies are resolved and everything works correctly.

nemesv nemesv · Accepted Answer · 2013-12-03T13:58:49

You can only have one From... expression inside in a kernel.Bind call.

So call your FromAssemblyContaining in different kernel.Bind statements, and it should work fine:

kernel.Bind(x => x.FromThisAssembly()
                  .SelectAllClasses().BindDefaultInterface());
kernel.Bind(x => x.FromAssemblyContaining<MyRepository>()
                  .SelectAllClasses().BindDefaultInterface());
kernel.Bind(x => x.FromAssemblyContaining<MyService>()
                  .SelectAllClasses().BindDefaultInterface());

Using Ninject and Ninject.Extensions.Conventions with referenced assemblies

1 Answers