asp.net – 如何在mvc中使用自定义成员身份添加更多自定义字段？

在帐户模型中,我重写了CreateUser方法：

public override MembershipUser CreateUser(string username,string password,string email,string passwordQuestion,string passwordAnswer,bool isApproved,object providerUserKey,out MembershipCreateStatus status)
{
    ValidatePasswordEventArgs args = new ValidatePasswordEventArgs(
        username,password,true);
    OnValidatingPassword(args);

    if (args.Cancel)
    {
        status = MembershipCreateStatus.InvalidPassword;
        return null;
    }

    if (RequiresUniqueEmail && GetUserNameByEmail(email) != "")
    {
        status = MembershipCreateStatus.DuplicateEmail;
        return null;
    }

    MembershipUser u = GetUser(username,false);
    if (u == null)
    {
        UserRepository _user = new UserRepository();

        // Here I call my new method which has fields I've created in the
        // User table; I'm using entity framework.    
        _user.CreateUser(username,email);
        status = MembershipCreateStatus.Success;
        return GetUser(username,false);
    }
    else
    {
        status = MembershipCreateStatus.DuplicateUserName;
    }

    return null;
}

public MembershipUser CreateUser(string username,string email)
{
    using (CustomMembershipDB db = new CustomMembershipDB())
    {
        User user = new User();
        user.UserName = username;
        user.Email = email;
        user.PasswordSalt = CreateSalt();
        user.Password = CreatePasswordHash(password,user.PasswordSalt);
        user.CreatedDate = DateTime.Now;
        user.IsActivated = false;
        user.IsLockedOut = false;
        user.LastLockedOutDate = DateTime.Now;
        user.LastLoginDate = DateTime.Now;

        //Generate an email key
        // user.NewEmailKey = GenerateKey();

        db.AddToUsers(user);
        db.SaveChanges();

        //send mail
        // SendMail(user);

        return GetUser(username);
    }
}

现在我需要添加更多两个字段,如名字和姓氏,但我怎样才能将它传递给上面的方法？

如果我在其中添加诸如名字和姓氏之类的参数,则覆盖方法CreateUser会给我一个错误:(