问ASP.Net MVC4通用主要困难

EN

public ActionResult Login(LoginModel model, string returnUrl)
{
    if (ModelState.IsValid)
    {
        User user = _userService.GetUser(model.Email.Trim());

        //Create Pipe Delimited string to store UserID and Role(s)
        var userData = user.ApplicantID.ToString();

        foreach (var role in user.UserRoles)
        {
            userData = userData + "|" + role.description;
        }

        _formAuthService.SignIn(user.ApplicantFName, false, userData);

        return RedirectToAction("Index", "Portfolio");
        }

        return View(model);
    }

public class FormsAuthenticationService : IFormsAuthenticationService
{
    public void SignIn(string userName, bool createPersistentCookie, string UserData)
    {
        if (String.IsNullOrEmpty(userName)) throw new ArgumentException("Value cannot be null or empty.", "userName");

        // Create and tuck away the cookie
        FormsAuthenticationTicket authTicket = new FormsAuthenticationTicket(1, userName, DateTime.Now, DateTime.Now.AddDays(15), createPersistentCookie, UserData);
        // Encrypt the ticket.
        string encTicket = FormsAuthentication.Encrypt(authTicket);

        //// Create the cookie.
        HttpCookie faCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encTicket);
        HttpContext.Current.Response.Cookies.Add(faCookie);
    }
}

protected void Application_AuthenticateRequest(Object sender, EventArgs e)
{

    // Get the authentication cookie
    string cookieName = FormsAuthentication.FormsCookieName;
    HttpCookie authCookie = Context.Request.Cookies[cookieName];

    // If the cookie can't be found, don't issue the ticket
    if (authCookie == null) return;

    // Get the authentication ticket and rebuild the principal
    // & identity
    FormsAuthenticationTicket authTicket = FormsAuthentication.Decrypt(authCookie.Value);

    string[] UserData = authTicket.UserData.Split(new Char[] { '|' });

    GenericIdentity userIdentity = new GenericIdentity(authTicket.Name);
    GenericPrincipal userPrincipal = new GenericPrincipal(userIdentity, UserData);
    Context.User = userPrincipal;

}

@if (HttpContext.Current.User.IsInRole("Applicant"))
{
    <p>text</text>
}