Autofac in ASP.Net MVC

Question

As a newbie to Autofac, I'm trying to figure out how to register my Repository for my Controllers. The Repository takes a web service in its constructor to communicate with the server. This application is multi-tenant and the tenant name is accessed in the MVC route data. Since I can't access the route data within global.asax like most of the examples, where do I inject this dependency and what would the code look like?

Answer 1

Try the Autofac.Features.Indexed.IIndex<K, V> type which allows you to build a mapping of keys to implementations.

public enum RepositoryWebServices { ServiceA, ServiceB, ServiceC }

builder.RegisterType<MyServiceA>().Keyed<IWebService>(RepositoryWebServices.ServiceA);
builder.RegisterType<MyServiceB>().Keyed<IWebService>(RepositoryWebServices.ServiceB);
builder.RegisterType<MyServiceC>().Keyed<IWebService>(RepositoryWebServices.ServiceC );

public MyRepository : IRepository
{
  IIndex<RepositoryWebServices, IWebService> _webServices;

  public MyRepository(IIndex<RepositoryWebServices, IWebService> webServices)
  {
    _webServices = webServices;
  }

  public UseWebService(string tenant)
  {
    IWebService webService = _webServices[(RepositoryWebServices)Enum.Parse(typeof(RepositoryWebServices), tenant)];

    // use webService
  }
}