public class X509UserNameValidator: UserNamePasswordValidator
    {
        public override void Validate(string userName, string password)
        {
            try
            {
                if (string.IsNullOrEmpty(userName))
                    throw new ArgumentNullException("userName");
                if (string.IsNullOrEmpty(password))
                    throw new ArgumentNullException("password");

                if (userName != "msky" || password != "msky")
                    throw new SecurityTokenException("用户名或者密码错误！");
            }
            catch (System.Exception ex)
            {
                Console.WriteLine(ex.Message);
                throw;
            }
        }
    }