登录时，使用 Forms验证，
string userData = UserProfileIO.Serialize(account);
FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
1,
account.Name,
System.DateTime.Now,
System.DateTime.Now.AddDays(30),
false,
userData,
FormsAuthentication.FormsCookiePath);

string encTicket = FormsAuthentication.Encrypt(ticket);

HttpCookie cokie = new HttpCookie(FormsAuthentication.FormsCookieName, encTicket);//FormsAuthentication .FormsCookieName配置文件的cookie名称
cokie.Expires = DateTime.Now.AddDays(5);
Response.Cookies.Add(cokie);

但登录后，

Context.User.Identity as FormsIdentity  为空

Request.IsAuthenticated  为 false

配置   

环境 VS2013  MVC5  .net4.5
web.comfig

<authentication mode="Forms">
<forms name=".ASPXAUTH" loginUrl="~/Account" defaultUrl="~/" timeout="2880" />
</authentication>

Global.asax.cs :

void MvcApplication_AuthorizeRequest(object sender, EventArgs e)
{
var id = Context.User.Identity as FormsIdentity;
if (id != null && id.IsAuthenticated)
{
var roles = id.Ticket.UserData ;

}
}

求指教