Hi,

I assume that you're using your virtual role in a Model object? Without much detail I would suggest to try to add a parameterless constructor to your class, which just to make DefaultModelBinder happy.

Am I missing something?

/Q

Hi,

No there is no model binding going on.

I just use it like this IPrincipal.IsInRole("MyCustomVirtualRole") to test if the current user is allowed to perform certain operations. For instance, I might use this in a controller action or in an action filter class.

The "no parameterless constructor" exception is thrown right at startup when EPiServer Framework runs its initialization code for registering all the defined virtual roles.

There are parts of the API that doesn't support constructor injection. If you still want to have a constructor accepting services for example to use in tests, I suggest you overload the constructor, like so:

public class MyClass
{
  private IService _service;

  public MyClass() : this(ServiceLocator.Current.GetInstance<IService>()) {}

  public MyClass(IService service)
  {
    _service = service;
  }
}

There are cases where this won't work, for example if the class is instantiated using the parameterless constructor before the DI container is initialized with the requested service.

Thanks Magnus, that's what I suspected. Your solution is fine - slightly more elegant than relying on Injected<IService> in my opinion!