C# implémente le prélude au développement de WeChat

/// <summary>
        /// 验证微信签名        
        /// </summary>
        /// <returns></returns>
        /// * 将token、timestamp、nonce三个参数进行字典序排序        
        /// * 将三个参数字符串拼接成一个字符串进行sha1加密        
        /// * 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信。
        private bool CheckSignature()
        {            var token = "token"; 
            var signature = HttpContext.Current.Request.QueryString["signature"];            var timestamp = HttpContext.Current.Request.QueryString["timestamp"];            var nonce = HttpContext.Current.Request.QueryString["nonce"];            var echostr = HttpContext.Current.Request.QueryString["echostr"];            string[] ArrTmp = { token, timestamp, nonce };
            Array.Sort(ArrTmp);     //字典排序
            var tmpStr = string.Join("", ArrTmp);
            tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");//加密方式            if (tmpStr.ToLower() == signature)
            {                return true;
            }            return false;
        }

 #region 接收消息        /// <summary>
        /// 接收微信发送的XML消息并且解析        /// </summary>
        private void ReceiveXml()
        {            var requestStream = HttpContext.Current.Request.InputStream;            var requestByte = new byte[requestStream.Length];
            requestStream.Read(requestByte, 0, (int)requestStream.Length);            var requestStr = Encoding.UTF8.GetString(requestByte);            if (!string.IsNullOrEmpty(requestStr))
            {                //封装请求类
                var requestDocXml = new XmlDocument();
                requestDocXml.LoadXml(requestStr);                var rootElement = requestDocXml.DocumentElement;                if (rootElement == null) return;                var wxXmlModel = new WxXmlModel
                {
                    ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText,
                    FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText,
                    CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText,
                    MsgType = rootElement.SelectSingleNode("MsgType").InnerText
                };                switch (wxXmlModel.MsgType)
                {                    case "text"://文本
                        wxXmlModel.Content = rootElement.SelectSingleNode("Content").InnerText;                        break;                    case "image"://图片
                        wxXmlModel.PicUrl = rootElement.SelectSingleNode("PicUrl").InnerText;                        break;                    case "event"://事件
                        wxXmlModel.Event = rootElement.SelectSingleNode("Event").InnerText;                        if (wxXmlModel.Event != "TEMPLATESENDJOBFINISH")//关注类型                        {
                            wxXmlModel.EventKey = rootElement.SelectSingleNode("EventKey").InnerText;
                        }                        break;                    default:                        break;
                }

                ResponseXML(wxXmlModel);//回复消息            }
        }        #endregion

        #region 回复消息        private void ResponseXML(WxXmlModel WxXmlModel)
        {            var QrCodeApi = new QrCodeApi();            var XML = "";            switch (WxXmlModel.MsgType)
            {                case "text"://文本回复
                    XML = ResponseMessage.GetText(WxXmlModel.FromUserName, WxXmlModel.ToUserName, WxXmlModel.Content);                    break;                case "event":                    switch (WxXmlModel.Event)
                    {                        case "subscribe":                            if (string.IsNullOrEmpty(WxXmlModel.EventKey))
                            {
                                XML = ResponseMessage.GetText(WxXmlModel.FromUserName, WxXmlModel.ToUserName, "关注成功");
                            }                            else
                            {
                                XML = ResponseMessage.SubScanQrcode(WxXmlModel.FromUserName, WxXmlModel.ToUserName, WxXmlModel.EventKey);//扫描带参数二维码先关注后推送事件                            }                            break;                        case "SCAN":
                            XML = ResponseMessage.ScanQrcode(WxXmlModel.FromUserName, WxXmlModel.ToUserName, WxXmlModel.EventKey);//扫描带参数二维码已关注 直接推送事件
                            break;
                    }                    break;                default://默认回复
                    break;
            }
            HttpContext.Current.Response.Write(XML);
            HttpContext.Current.Response.End();
        }        #endregion