Is it possible to name a dependency with StructureMap?

Question

I would like to be able to inject named dependencies into a class using StructureMap if that is at all possible. The main reason I want this right now is for connection string injection.

I may be doing this the wrong way, but here's how I've got it (just need to add injection now):

psuedo:

public class MyServiceClass
     string connectionString;

     public MyServiceClass(string connectionString)
          this.connectionString = connectionString;

     public void DeleteObject
          var db = new EntitiesObject(connectionString)

Is there any way to put a name on the connection string constructor parameter so that StructureMap would know how to inject it?

EDIT: I could have multiple connection strings that are determined at run-time from a configuration database.

EDIT: One solution I've thought of is to create a ThisDatabaseConnectionString and a ThatDatabaseConnectionString class... that way it could inject the connection string based on type

Answer 1

You could do this (assuming that myConnectionString is a string instance):

container.Configure(r => r
    .ForConcreteType<MyServiceClass>()
    .Configure.Ctor<string>().Is(myConnectionString));

If you also need to map MyServiceClass from an interface (or abstract base class), you can do this instead:

container.Configure(r => r
    .For<IServiceClass>()
    .Use<MyServiceClass>()
    .Ctor<string>().Is(myConnectionString));

---

If you have previously configured named connection strings configured in the container, you can do something like this:

container.Configure(r => r
    .For<string>()
    .Use("foo")
    .Named("connStr1"));
container.Configure(r => r
    .For<string>()
    .Use("bar")
    .Named("connStr2"));
container.Configure(r => r
    .ForConcreteType<MyServiceClass>()
    .Configure.Ctor<string>().Is((IContext ctx) => 
        ctx.GetInstance<string>("connStr2")));