Implementierungsmethode zur Verwendung von .NET zum Parsen von WeChat-Zahlungen

 //判断是否网页授权，获取授权code,没有代表没有授权，构造网页授权获取code,并重新请求
      if (string.IsNullOrEmpty(Request.QueryString["code"]))
      {
        string redirectUrl = _weChatPaySerivce.GetAuthorizeUrl(account.AppId, account.RedquestUrl,
          "STATE" + "#wechat_redirect", "snsapi_base");
        return Redirect(redirectUrl);
      }

public string GetAuthorizeUrl(string appId, string redirectUrl, string state, string scope)
    {
      string url = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope={2}&state={3}",
          appId, HttpUtility.UrlEncode(redirectUrl), scope, state);
      /* 这一步发送之后，客户会得到授权页面，无论同意或拒绝，都会返回redirectUrl页面。
       * 如果用户同意授权，页面将跳转至 redirect_uri/?code=CODE&state=STATE。这里的code用于换取access_token（和通用接口的access_token不通用）
       * 若用户禁止授权，则重定向后不会带上code参数，仅会带上state参数redirect_uri?state=STATE
       */
      AppLog.Write("获取到授权url:", AppLog.LogMessageType.Debug); 
      return url;
    }

 public Tuple<string, string> GetOpenidAndAccessTokenFromCode(string appId, string code, string appSecret)
    {
      Tuple<string, string> tuple = null;
      try
      {
        string url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appId, appSecret, code);
        string result = WeChatPayHelper.Get(url);
        AppLog.Write("微信支付-获取openid和access_token 请求Url:" + url + "result:" + result, AppLog.LogMessageType.Debug);
        if (!string.IsNullOrEmpty(result))
        {
          var jd=Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, string>>(result);
          tuple = new Tuple<string, string>(jd["openid"],jd["access_token"]);
          AppLog.Write("微信支付-获取openid和access_token成功", AppLog.LogMessageType.Debug);
        }
      }
      catch (Exception ex)
      {
        AppLog.Write("微信支付：获取openid和access_tokenu异常", AppLog.LogMessageType.Debug,ex);
      }
      return tuple;
    }

//生成JsAPI支付参数
      RequestHandler paySignReqHandler = new RequestHandler(null);
      paySignReqHandler.SetParameter("appId", account.AppId);
      paySignReqHandler.SetParameter("timeStamp", timeStamp);
      paySignReqHandler.SetParameter("nonceStr", nonceStr);
      paySignReqHandler.SetParameter("package", string.Format("prepay_id={0}", prepayId));
      paySignReqHandler.SetParameter("signType", "MD5");
      string paySign = paySignReqHandler.CreateMd5Sign("key", account.PaySignKey);
      WeChatJsPayRequestModel resultModel = new WeChatJsPayRequestModel
      {
        AppId = account.AppId,
        NonceStr = nonceStr,
        TimeStamp = timeStamp,
        Package = string.Format("prepay_id={0}", prepayId),
        PaySign = paySign,
        SignType = "MD5"
      };

private string CreateWeixinJs(WeChatJsPayRequestModel model)
    {
      string js = @"<script type=&#39;text/javascript&#39;>
                callpay();
                function jsApiCall(){
                 WeixinJSBridge.invoke(
                  &#39;getBrandWCPayRequest&#39;, {
                    requestParam
                  },
                  function (res) {
                    if(res.err_msg == &#39;get_brand_wcpay_request:ok&#39; ){
                        window.location.href = &#39;successUrl&#39;;
                    }else{
                        window.location.href = &#39;failUrl&#39;;
                    }
                  }
                 ); 
                }
               function callpay()
                {
                  if (typeof WeixinJSBridge == &#39;undefined&#39;){
                    if( document.addEventListener ){
                      document.addEventListener(&#39;WeixinJSBridgeReady&#39;, jsApiCall, false);
                    }else if (document.attachEvent){
                      document.attachEvent(&#39;WeixinJSBridgeReady&#39;, jsApiCall); 
                      document.attachEvent(&#39;onWeixinJSBridgeReady&#39;, jsApiCall);
                    }
                  }else{
                    jsApiCall();
                  }
                }
            </script>";
      string requestParam = string.Format(@"&#39;appId&#39;: &#39;{0}&#39;,&#39;timeStamp&#39;: &#39;{1}&#39;,&#39;nonceStr&#39;: &#39;{2}&#39;,&#39;package&#39;: &#39;{3}&#39;,&#39;signType&#39;: &#39;{4}&#39;,&#39;paySign&#39;: &#39;{5}&#39;",
        model.AppId, model.TimeStamp, model.NonceStr, model.Package, model.SignType, model.PaySign);
      js = js.Replace("requestParam", requestParam)
        .Replace("successUrl", model.JumpUrl + "&result=1")
        .Replace("failUrl", model.JumpUrl + "&result=0");
      AppLog.Write("生成可执行脚本成功", AppLog.LogMessageType.Debug);
      return js;
    }

ResponseHandler resHandler = new ResponseHandler(System.Web.HttpContext.Current);
      bool isSuccess = _weChatPaySerivce.ProcessNotify(resHandler);
      if (isSuccess)
      {
        string result = @"<xml>
                  <return_code><![CDATA[SUCCESS]]></return_code>
                  <return_msg><![CDATA[支付成功]]></return_msg>
                 </xml>";
        HttpContext.Response.Write(result);
        HttpContext.Response.End();
      }
      return new EmptyResult();