迁移到ASP.NET MVC 4后，授权被破坏

I migrated from MVC 2 to MVC 4. I use the Facebook Javascript API for authentication, so the user logs in via Facebook and I just get their Facebook Id. If their Facebook login attempt was successful, in MVC 2, I simply did this to log them into my site, so that they can access methods which have the [Authorize] attribute:I migrated from MVC 2 to MVC 4. I use the Faceb