Seemingly circular dependencies causing issues with Castle Windsor

Question

I have a IUserService (and other services) that I am registering in bulk in my ServiceInstaller.cs:

  container.Register(
                AllTypes.FromAssemb         


        

Answer 1

Property injection will solve your problem, because it breaks the dependency cycle. Just look at Krzysztof's example and try to instantiate a UserService; You can't. Now take a look at the following example:

public class UserService
{
    UserService(AuthenticationService a) { }
}

public class AuthenticationService 
{
    AuthenticationService() { }

    public UserService UserService { get; set; }
}

In this example, the UserService dependency of the AuthenticationService is 'promoted' from a constructor argument to a property. Now you can create a user service like this:

var a = new AuthenticationService();
var s = new UserService(a);
a.UserService = s;

Breaking the circular dependency can be done with property injection and any dependency injection framework can be configured to allow property injection.