MVC 5 OWIN login with claims and AntiforgeryToken. Do I miss a ClaimsIdentity provider?

Question

I\'m trying to learn Claims for MVC 5 OWIN login. I try\'ed to keep it as simple as possible. I started with the MVC template and inserted my claims code (see below). I get an e

Answer 1

In your Application_Start(), specify which Claim to use as the NameIdentifier:

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        ...

        System.Web.Helpers.AntiForgeryConfig.UniqueClaimTypeIdentifier = 
            System.Security.Claims.ClaimTypes.NameIdentifier;

        ...
    }
}

See: http://brockallen.com/2012/07/08/mvc-4-antiforgerytoken-and-claims/