Injecting an IPrincipal with Unity Property Injection at runtime

Using Unity in an ASP.Net MVC 2 app I have various dependencies on Controllers instantiated correctly. However, I want to ensure that the current IPrincipal for the user is going to be passed via injection to lower level Services, Repository etc.

Therefore in a lower level service I have something like:

[Dependency] IPrincipal CurrentUser {get; set;}

If I use Property Dependency Injection I do not get what I want because the Controller is instantiated BEFORE a User principal is available and in any case Unity does not know to get the current user credentials.

So what I want is to be able to inject the current user's IPrincipal (or probably RolePrincipal) into one of the dependencies for the Controller.

How can I do this?

-------------Problems Reply------------

Why not take the direct route, and just assign it.

Thread.CurrentPrincipal = user;

Dependency injection is good, but don't let it get in the way of the best dependency injector, the programmer.

While this thread is old, it looks like Jon Kruger has an answer that seems to directly answer the original question:

Why inject it? The current principal is already present as User. That is what we use, and it works fine so far. The user shouldn't change within a single request, should it?

protected void Application_AuthenticateRequest()
var ticket = GetAuthenticationTicket();
// Perform actual authentication, etc.
MyUser user = BigAuthStuff();
Context.User = user;
Thread.CurrentPrincipal = user;

public class MyBaseController : Controller
protected MyUser AuthenticatedUser
get { return User as MyUser; }
} mvc Views:0 Time:2010-03-09

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