UnityContainer - how register/resolve with dependency chaining

I have an MVC app that has Controller that takes a IDomainService. The DomainService class constructor takes an IRepository and the Repository class constructor requires a connection string.

I have something like this:

string connectionString = ConfigurationManager
    .ConnectionStrings["ApplicationServices"].ConnectionString;

c.RegisterInstance("ConnectionString", connectionString);

c.RegisterType<IDepartmentRepository, DepartmentRepository>(
    "DepartmentRepository", 
    new InjectionConstructor(connectionString));

c.RegisterType<IDepartmentDom开发者_运维技巧ainService, DepartmentService>(
    new InjectionConstructor(
        new ResolvedParameter<IDepartmentRepository>(
            "DepartmentRepository")));

However, this doesn't work.

Am I do something wrong? I have no problem with the repository injection, but I can't get my domain service injected (with the repository) to work.

Thanks.

I usually add a small class for this:

public class AppConfigConnectionFactory : IConnectionFactory
{
   public IDbConnection Create() 
   { 
        return new SqlConnection(ConfigurationManager
             .ConnectionStrings["ApplicationServices"].ConnectionString);
   }
}

c.RegisterType<IConnectionFactory, AppConfigConnectionFactory>();
c.RegisterType<IDepartmentRepository, DepartmentRepository>();

Do not depend on strings if you do not have to. And you'll also avoid some code duplication in each repository with this solution.