/// <summary>
        /// 融云-消息撤回
        /// </summary>
        public ReturnValueModel MessageRecall(RecallMessageInputDto inputDto, WorkUser workUser)
        {
            ReturnValueModel rvm = new ReturnValueModel();

            string appKey    = ConfigurationManager.AppSettings["RongCloudAppKey"];
            string appSecret = ConfigurationManager.AppSettings["RongCloudAppSecret"];
            string _host     = ConfigurationManager.AppSettings["RongCloudUrl"];
            string url       = $"{_host}/message/recall.json";

            StringBuilder sb = new StringBuilder();

            sb.Append("&conversationType=").Append(HttpUtility.UrlEncode("1", Encoding.UTF8));
            sb.Append("&fromUserId=").Append(HttpUtility.UrlEncode(inputDto.SenderId.ToString(), Encoding.UTF8));
            sb.Append("&targetId=").Append(HttpUtility.UrlEncode(inputDto.TargetId.ToString(), Encoding.UTF8));
            sb.Append("&messageUID=").Append(HttpUtility.UrlEncode(inputDto.UId.ToString(), Encoding.UTF8));
            sb.Append("&sentTime=").Append(HttpUtility.UrlEncode(inputDto.SentTime.ToString(), Encoding.UTF8));
            String body = sb.ToString();

            if (body.IndexOf("&") == 0)
            {
                body = body.Substring(1, body.Length - 1);
            }

            string result = RongHttpClient.ExecutePost(appKey, appSecret, body, url, "application/x-www-form-urlencoded");

            var res = (ResponseResult)RongJsonUtil.JsonStringToObj <ResponseResult>(result);

            if (res.Code == 200)
            {
                rvm.Msg     = "success";
                rvm.Success = true;
                rvm.Result  = res;
                return(rvm);
            }
            else
            {
                rvm.Msg     = "消息撤回失败";
                rvm.Success = false;
                rvm.Result  = result;
                return(rvm);
            }
        }
        public IHttpActionResult MessageRecall(RecallMessageInputDto inputDto)
        {
            var ret = _rongCloudService.MessageRecall(inputDto, WorkUser);

            return(Ok(ret));
        }