/// <summary>
        /// 验证EMail是否合法
        /// </summary>
        /// <param name="email">要验证的Email</param>
        public static bool IsEmail(string email)
        {
            //如果为空，认为验证不合格
            if (IsNullOrEmpty(email))
            {
                return false;
            }

            //清除要验证字符串中的空格
            email = email.Trim();

            //模式字符串
            string pattern = @"^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$";

            //验证
            return RegexHelper.IsMatch(email, pattern);
        }
//csharp/8593