MVC4 WebSecurity如何设置ComplexType模型的成员值？

我在Simplemembership的基础上定制了一下UserProfile，使其中一些个人信息独立出来成为了一个叫UserExtraInfo的ComplexType模型如下：

  [Table("UserProfile")]
    public class UserProfile
    {
        [Key]
        [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
        [Display(Name = "编号")]
        public int UserId { get; set; }

        [Required]
        [Display(Name = "用户名")]
        [StringLength(10, MinimumLength = 2, ErrorMessage = "用户名的长度应该在2~10之间")]
        public string UserName { get; set; }

        [Required]
        [Display(Name = "班级")]
        [ForeignKey("ClassProfile")]
        public int? ClassId { get; set; }
        public ClassProfile ClassProfile { get; set; }

        public UserExtraInfo UserExtraInfo { get; set; }

        [Timestamp]
        public byte[] RowVersion { get; set; }
    }

    [ComplexType]
    public class UserExtraInfo
    {
        [Display(Name = "性别")]
        public Gender? Gender { get; set; }

        [DataType(DataType.PhoneNumber)]
        [Display(Name = "电话")]
        public string Phone { get; set; }

        [DataType(DataType.Date)]
        [Display(Name = "出生日期")]
        public System.DateTime? BirthDay { get; set; }

        [StringLength(30, ErrorMessage = "用户描述不能超过30个字")]
        [DataType(DataType.MultilineText)]
        [Display(Name = "用户简介")]
        public string UserDesc { get; set; }
    }

但是UserProfile是由WebSecurity来操作的，所以我在添加用户的时候是这样写的：

 WebSecurity.CreateUserAndAccount(
                    "Administrator",
                    "admin",
                    new
                    {
                        ClassId = ClassIndex,
                        UserExtraInfo = new UserExtraInfo()
                        {
                            Phone = "18267912632",
                            BirthDay = new System.DateTime(2005, 9, 28),
                            UserDesc = "the Admin of this site！"
                        }
                    });

但是这样会报错，有人知道应该如何写吗？

new
->
new UserProfile

谢谢，但是我按照你的意思把代码改成下面之后还是抛出了ArgumentException错误：
“不存在从对象类型 MvcClassManageSystem.Models.UserExtraInfo 到已知的托管提供程序本机类型的映射。”

  WebSecurity.CreateUserAndAccount(
                               "Administrator",
                               "admin",
                               new UserProfile
                               {
                                   ClassId = 0,
                                   UserExtraInfo = new UserExtraInfo()
                                   {
                                       Phone = "18267912632",
                                       BirthDay = new System.DateTime(2005, 9, 28),
                                       UserDesc = "the Admin of this site！"
                                   }
                               });