/// <summary>
        /// 验证一个检验码是否有效
        /// </summary>
        /// <param name="phoneNum">手机号</param>
        /// <param name="sum">检验码</param>
        /// <param name="type">功能用途</param>
        /// <returns>true表示有效,false表示无效</returns>
        public bool CheckingWithSum(string phoneNum, string sum, MsgNoticeTypeEnum type)
        {
            string key = CreateMemcacheKey(phoneNum, type);

            try
            {
                PhoneSumCache sc = mc.GetObject(key) as PhoneSumCache;
                if (sc == null)
                {
                    myLog.WarnFormat("找不到这个号码的检验码, 号码:{0},功能:{1}", phoneNum, type);
                    return(false);
                }

                if (sum != sc.sum)
                {
                    // 如果探测检验码太频,则强制做个延时
                    if (this.lastCheckingInvalid >= DateTime.Now)
                    {
                        Thread.Sleep(500);
                    }
                    this.lastCheckingInvalid = DateTime.Now;
                    return(false);
                }
                else
                {
                    return(true);
                }
            }
            catch (Exception e)
            {
                myLog.WarnFormat("检测号码的检验码时有异常, 号码:{0},功能:{1}", e, phoneNum, type);
            }

            return(false);
        }
        /// <summary>
        /// 发送一个临时的检验码至手机
        /// </summary>
        /// <param name="phoneNum">手机号</param>
        /// <param name="type">功能用途</param>
        /// <param name="expireTime">超时时间,到时间会自动清除</param>
        /// <returns>0为成功,其它值表示错误</returns>
        public int SendMsgWithSum(string phoneNum, MsgNoticeTypeEnum type, DateTime expireTime)
        {
            string   key     = CreateMemcacheKey(phoneNum, type);
            DateTime curDate = DateTime.Now;

            // 检测该号码是否过于频繁被发送(同一号码一分钟内最多1次)
            DateTime dt;

            if (sentCache.TryGetValue(key, out dt) == true)
            {
                if (dt.AddSeconds(60) >= curDate)
                {
                    myLog.WarnFormat("短信发送太频繁,禁止。号码:{0},功能:{1}", phoneNum, type);
                    return((int)CodeEnum.TooManyMsg);
                }
            }

            // 检测整个系统发送频率是否太高(一分钟内最多5个)
            int cnt = 0;

            foreach (var e in sentCache)
            {
                if (e.Value.AddSeconds(60) >= curDate)
                {
                    cnt++;
                    if (cnt > 5)
                    {
                        myLog.WarnFormat("系统在1分钟内的短信请求太频繁,禁止");
                        return((int)CodeEnum.TooManyMsg);
                    }
                }
            }

            //// 开始发送,并写入到memcache,以及sentCache
            int           result      = -1;
            string        strRet      = null;
            StringBuilder url         = new StringBuilder();
            string        mobile      = "&mobile=" + phoneNum;
            string        randomDigit = GenerateRandomDigit();
            string        message     = "【星际云】提醒您:本次操作的验证码是" + randomDigit + ",请勿将验证码泄露于他人,验证码有效期2分钟";
            string        content     = "&content=" + Base64.FromStringToBase64(message);

            // url文档参考:"短信验证 - HTTP接口说明文档.docx"
            url.Append("http://api.shumi365.com:8090/sms/send.do?userid=410110&pwd=06D1CEBD15D7F15ABD6EF30757178453&timespan=20141229172508&msgfmt=UTF8");
            url.Append(mobile);
            url.Append(content);

            try
            {
                HttpWebRequest request = WebRequest.Create(url.ToString()) as HttpWebRequest;
                request.Method = "GET";
                WebResponse  response = request.GetResponse();
                Stream       stream   = response.GetResponseStream();
                StreamReader ser      = new StreamReader(stream, Encoding.Default);
                strRet = ser.ReadToEnd();

                if (strRet != null && strRet != "")
                {
                    if (int.TryParse(strRet, out result))
                    {
                        if (result >= 0)
                        {
                            result = 0;
                            PhoneSumCache psc = new PhoneSumCache();
                            psc.sum = randomDigit;
                            mc.AddObject(key, psc, expireTime);
                            sentCache.Add(key, curDate);
                        }
                        else
                        {
                            myLog.WarnFormat("发送临时的检验码至手机失败,号码:{0},功能:{1}, 错误码:{2}", phoneNum, type, result);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                myLog.WarnFormat("发送临时的检验码至手机失败, 号码:{0},功能:{1}", ex, phoneNum, type);
            }
            return(result);
        }