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【C#】微信公众平台开发C#版
作者:德帅 / 发布于2016/9/14/ 923
//获取请求  
protected void Page_Load(object sender, EventArgs e)
        {
            string requestMethod = Request.HttpMethod.ToLower();

            string responseMsg = "";
            switch (requestMethod)
            {
                case "get":
                    responseMsg = GetRequest();
                    break;
                case "post":
                    responseMsg = PostRequest();
                    break;
                default:
                    break;
            }
            ResponseWrite(responseMsg);
        }

        /// <summary>
        /// 处理Get请求，用于验证URL的有效性
        /// </summary>
        /// <returns></returns>
        private string GetRequest()
        {
            string msg = "";

            // 微信加密签名
            string signature = Request.QueryString["signature"];
            // 时间戳
            string timestamp = Request.QueryString["timestamp"];
            // 随机数
            string nonce = Request.QueryString["nonce"];
            // 随机字符串
            string echostr = Request.QueryString["echostr"];

            if (string.IsNullOrWhiteSpace(signature))
            {
                msg = "signature为空";
                return msg;
            }
            bool flag = IsValid(token, signature, timestamp, nonce);
            if (flag)
            {
                msg = echostr;
            }
            return msg;
        }

        /// <summary>
        /// 验证是否有效
        /// </summary>
        /// <param name="token"></param>
        /// <param name="signature"></param>
        /// <param name="timestamp"></param>
        /// <param name="nonce"></param>
        /// <returns></returns>
        public bool IsValid(string token, string signature, string timestamp, string nonce)
        {
            string[] strs = new[] { token, timestamp, nonce };
            Array.Sort(strs);// 将token、timestamp、nonce三个参数进行字典序排序

            StringBuilder strBul = new StringBuilder();// 将三个参数字符串拼接成一个字符串
            foreach (string s in strs)
            {
                strBul.Append(s);
            }
            //sha1加密
            string encryptStr = FormsAuthentication.HashPasswordForStoringInConfigFile(strBul.ToString(), "SHA1");

            return encryptStr.ToLower() == signature.ToLower();
        }


        /// <summary>
        /// 处理用户请求
        /// </summary>
        /// <returns></returns>
        private string PostRequest()
        {
            string content = "";           
            try
            {
                StreamReader reader = new StreamReader(Request.InputStream);
                string data = reader.ReadToEnd();

                if (string.IsNullOrWhiteSpace(data))
                {
                    return content;
                }

                XmlDocument xml = new XmlDocument();
                xml.LoadXml(data);

                string toUserName = xml.GetElementsByTagName("FromUserName")[0].InnerText;
                string fromUserName = xml.GetElementsByTagName("ToUserName")[0].InnerText;
                string msgType = xml.GetElementsByTagName("MsgType")[0].InnerText;
                int createTime = ConvertDateTimeInt(DateTime.Now);
                switch (msgType)
                {
                    case "text":
                        string keyword = xml.GetElementsByTagName("Content")[0].InnerText;
                        content = GameInfo(toUserName, fromUserName, createTime, keyword);
                        break;
                    case "event":
                        string eventType = xml.GetElementsByTagName("Event")[0].InnerText;
                        content = EventHandler(toUserName, fromUserName, createTime, eventType);
                        break;
                    default:
                        string ret = noSeekTips;
                        content = DefaultInfo(toUserName, fromUserName, createTime, ret);
                        break;
                }             
            }
            catch (Exception ex)
            {
                LogErr.WirteErrToFile(ex, ex.StackTrace, ex.Source);
            }
            return content;
        }

        /// <summary>
        /// 事件处理
        /// </summary>
        /// <param name="toUserName"></param>
        /// <param name="fromUserName"></param>
        /// <param name="createTime"></param>
        /// <param name="eventType"></param>
        /// <returns></returns>
        private string EventHandler(string toUserName, string fromUserName, int createTime, string eventType)
        {
            string msg = "";
            switch (eventType)
            {
                case "subscribe":
                    msg = AddAttention(toUserName, fromUserName, createTime);
                    break;
                case "unsubscribe":
                    msg = "";
                    break;
                default:
                    msg = "";
                    break;
            }
            return msg;
        }

        /// <summary>
        /// 关注事件
        /// </summary>
        /// <param name="toUserName"></param>
        /// <param name="fromUserName"></param>
        /// <param name="createTime"></param>
        /// <returns></returns>
        private string AddAttention(string toUserName, string fromUserName, int createTime)
        {
            string content = greetings;
            return DefaultInfo(toUserName, fromUserName, createTime, content);
        }

        /// <summary>
        /// 默认回复（文本信息）
        /// </summary>
        /// <param name="toUserName"></param>
        /// <param name="fromUserName"></param>
        /// <param name="createTime"></param>
        /// <param name="content"></param>
        /// <returns></returns>
        private string DefaultInfo(string toUserName, string fromUserName, int createTime, string content)
        {
            string msg = "<xml>" +
                          "<ToUserName><![CDATA[" + toUserName + "]]></ToUserName>" +
                          "<FromUserName><![CDATA[" + fromUserName + "]]></FromUserName>" +
                          "<CreateTime>" + createTime + "</CreateTime>" +
                          "<MsgType><![CDATA[text]]></MsgType>" +
                          "<Content><![CDATA[" + content + "]]></Content>" +
                          "<FuncFlag>0</FuncFlag>" +
                          "</xml>";
            return msg;
        }

     /// <summary>
        /// 转换为时间戳
        /// </summary>
        /// <param name="time"></param>
        /// <returns></returns>
        private int ConvertDateTimeInt(System.DateTime time)
        {
            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            return (int)(time - startTime).TotalSeconds;
        }

        /// <summary>
        /// 输出响应数据
        /// </summary>
        /// <param name="obj"></param>
        private void ResponseWrite(object obj)
        {
            CancelCache();
            Response.ContentType = "text/plain";
            Response.Charset = "UTF-8";
            Response.Write(obj != null ? obj : "");
            Response.End();
        }

        /// <summary>
        /// 取消缓存
        /// </summary>
        private void CancelCache()
        {
            Response.BufferOutput = true;
            Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.AppendHeader("Pragma", "No-Cache");
        }
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