webapi框架微信被动回复消息接收不到

[a83068836]

[HttpGet]
        [Route("GetByModel")]  //路由路径
        public HttpResponseMessage GetByModel(string signature, string timestamp, string nonce, string echostr)
        {

            try
            {
                string EchoStr = valid(token, signature, timestamp, nonce, echostr);

                if (!string.IsNullOrEmpty(EchoStr))
                {
                    return ToHttpMsgForWeChat(echostr);
                }
                else
                {
                    return ToHttpMsgForWeChat("验证失败！");
                }
            }
            catch (Exception ex)
            {
                return ToHttpMsgForWeChat(ex.ToString());
            }
        }
        [HttpPost]
        //[Route("GetByModel")]  //路由路径
        /// <summary>
        /// 接收用户发送的消息
        /// </summary>
        public void GetByModel()
        {
            try
            {
                HttpContextBase context = (HttpContextBase)Request.Properties["MS_HttpContext"];//获取传统context   
                HttpRequestBase request = context.Request;//定义传统request对象
                HttpResponseBase response = context.Response;
                string echostr = request.Params["echostr"];
                string signature = request.Params["signature"];
                string timestamp = request.Params["timestamp"];
                string nonce = request.Params["nonce"];
                //LogHelper.WriteLog("测试测试");
                if (!CheckSignature(token, signature, timestamp, nonce))
                {
                    //WeLogger.Debug("验证消息真实性---失败！");
                    response.Write(string.Empty);
                    response.End();
                    return;
                }
                string data = ReadStream2String(request.InputStream);
                string responseData = ParseMessage(data);
                response.Write(responseData);
                response.End();

            }
            catch (Exception ex)
            {
                //LogHelper.WriteLog(ex.ToString());
            }
        }

上面一块是验证微信没问题，下面一块收不到信息，有没有大佬帮忙，很急，高分求帮忙

[a83068836]

下面一块调试都跳不进去，