// get user's role
        List<UserType> roles = rc.rolesRepository.GetUserRoles(rc.userLoginRepository.GetUserID(userName));
        List<string> rolesList = (from r in roles
                                 select r.ToString()).ToList();
        string[] rolesArr = rolesList.ToArray();

        // create encryption cookie
        FormsAuthenticationTicket authTicket = new FormsAuthenticationTicket(
                1,userName,DateTime.Now,DateTime.Now.AddDays(90),createPersistentCookie,String.Join(";",rolesArr) //user's roles 
                );

        // add cookie to response stream
        string encryptedTicket = FormsAuthentication.Encrypt(authTicket);

        System.Web.HttpCookie authCookie = new System.Web.HttpCookie(FormsAuthentication.FormsCookieName,encryptedTicket);
        System.Web.HttpContext.Current.Response.Cookies.Add(authCookie);
        //FormsAuthentication.SetAuthCookie(userName,createPersistentCookie);

以下是我在Global.asax中的代码,将用户角色设置为用户身份：

protected void Application_AuthenticateRequest(Object sender,EventArgs e)
    {
        HttpCookie authCookie = Context.Request.Cookies[FormsAuthentication.FormsCookieName];
        if (authCookie == null || authCookie.Value == "")
        {
            return;
        }
        FormsAuthenticationTicket authTicket = null;
        try
        {
            authTicket = FormsAuthentication.Decrypt(authCookie.Value);
            string[] roles = authTicket.UserData.Split(new char[] { ';' });
            if (Context.User != null)
            {
                Context.User = new System.Security.Principal.GenericPrincipal(Context.User.Identity,roles);
            }
        }
        catch
        {
            return;
        }
    }

但是,如果顶部示例中的“createPersistentCookie”为TRUE,则不会创建持久性cookie.如果我删除最后一行如下所示：

//System.Web.HttpContext.Current.Response.Cookies.Add(authCookie);
        FormsAuthentication.SetAuthCookie(userName,createPersistentCookie);

那么在我的硬盘驱动器上创建持久性cookie.但是在Global.asax代码中,“authTicket”中的UserData字段为空,因此我无法正确设置角色！

所以我必须使用SetAuthCookie创建一个持久的cookie,但是由于某些原因,UserData字段从持久性cookie中消失.

这是什么答案？