messageHandler.OmitRepeatedMessage = true;//启用消息去重功能

       /// <summary>
        /// 最简化的处理流程（不加密）
        /// </summary>
        [HttpPost]
        [ActionName("MiniPost")]
        public ActionResult MiniPost(string signature, string timestamp, string nonce, string echostr)
        {
            if (!CheckSignature.Check(signature, timestamp, nonce, Token))
            {
                return new WeixinResult("参数错误！");//v0.8+
            }

            var messageHandler = new CustomMessageHandler(Request.InputStream, null, 10);

            messageHandler.OmitRepeatedMessage = true;//启用消息去重功能

            messageHandler.Execute();//执行微信处理过程

            return new FixWeixinBugWeixinResult(messageHandler);
        }

        public virtual void OnExecuting()
        {
            if (OmitRepeatedMessage && CurrentMessageContext.RequestMessages.Count > 1)
            {
                var lastMessage = CurrentMessageContext.RequestMessages[CurrentMessageContext.RequestMessages.Count - 2];
                if (lastMessage.MsgId != 0 && lastMessage.MsgId == RequestMessage.MsgId)
                {
                    CancelExcute = true;//重复消息，取消执行
                }
            }
        }