asp.net webapi 微信接口接入

        /// <summary>
        /// 接口认证
        /// </summary>
        /// <param name="echostr"></param>
        /// <param name="signature"></param>
        /// <param name="timestamp"></param>
        /// <param name="nonce"></param>
        /// <returns></returns>
        [HttpGet]
        public async Task<HttpResponseMessage> wx(string echostr, string signature, string timestamp, string nonce)
        {
            string token = "token";
            if (!CheckSignature(token, signature, timestamp, nonce))
                echostr = "验证不正确";
            HttpResponseMessage responseMessage = new HttpResponseMessage { Content = new StringContent(echostr, Encoding.GetEncoding("UTF-8"), "text/plain") };

            return responseMessage;
        }
        /// <summary>
        /// 接收客服消息
        /// </summary>
        /// <returns></returns>
        [HttpPost]
        public async Task<HttpResponseMessage> wx()
        {
            LogHelper log = new LogHelper();
            var content = await Request.Content.ReadAsStringAsync();
            log.LogError(content);
            HttpResponseMessage responseMessage = new HttpResponseMessage();
            return responseMessage;
        }
        /// <summary>
        /// 验证微信签名
        /// </summary>
        private bool CheckSignature(string token, string signature, string timestamp, string nonce)
        {
            string[] ArrTmp = { token, timestamp, nonce };

            Array.Sort(ArrTmp);
            string tmpStr = string.Join("", ArrTmp);
            var data = SHA1.Create().ComputeHash(Encoding.UTF8.GetBytes(tmpStr));
            var sb = new StringBuilder();
            foreach (var t in data)
            {
                sb.Append(t.ToString("X2"));
            }
            tmpStr = sb.ToString();
            tmpStr = tmpStr.ToLower();

            if (tmpStr == signature)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

　　httpget方法，用于接口接入。

     httpPost方法，用于后面接收消息。然后根据消息内容做解析。

     webapi使用异步可以提高效率。