微信公众号支付

/// <summary>
        /// 获取openid 并返回视图
        /// </summary>
        /// <param name="Code"></param>
        /// <param name="OrderGuid"></param>
        /// <returns></returns>
        public ActionResult VisaPay(string Code, Guid OrderGuid)
        {
            try
            {
                var appid = "wxxxxxxxxxxxxxxxxxxxxxxx";
                var secret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
                if (string.IsNullOrEmpty(Code))
                {
                    //向微信发送请求 获取code
                    string url1 = UrlEncode("http://wechat.yimalx.com/WeChatSite/WeChatPay/VisaPay?orderGuid=" + OrderGuid);
                    var url = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect", appid, url1);
                    return Redirect(url);
                }
                else
                {
                    //获取token
                    var client = new System.Net.WebClient();
                    client.Encoding = System.Text.Encoding.UTF8;

                    var url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appid, secret, Code);
                    var data = client.DownloadString(url);
                    var serializer = new JavaScriptSerializer();
                    var obj = serializer.Deserialize<Dictionary<string, string>>(data);
                    string accessToken;
                    if (!obj.TryGetValue("access_token", out accessToken))
                        return Redirect("404");

                    var opentid = obj["openid"];

                    var model = OrderInfoManager.Instance.GetById(OrderGuid);
                    ViewData["PayAmount"] = model.PayAmount;
                    ViewData["OrderGuid"] = OrderGuid;
                    string str = WeChatPayHelper.GoToWeCharJSPay(OrderGuid, opentid);
                    CreateLog.SaveLogs("str==============================" + str + "=================================", 1);
                    var codeId = new XmlDocument();
                    codeId.LoadXml(str);
                    var info = new WeChatInfo();
                    //8.读取xml节点的值
                    info.return_code = codeId.SelectSingleNode("xml/return_code").InnerText;
                    info.return_msg = codeId.SelectSingleNode("xml/return_msg").InnerText;
                    info.appid = codeId.SelectSingleNode("xml/appid").InnerText;
                    info.mch_id = codeId.SelectSingleNode("xml/mch_id").InnerText;
                    info.nonce_str = codeId.SelectSingleNode("xml/nonce_str").InnerText;
                    info.openid = opentid;
                    info.sign = codeId.SelectSingleNode("xml/sign").InnerText;
                    info.result_code = codeId.SelectSingleNode("xml/result_code").InnerText;
                    info.prepay_id = codeId.SelectSingleNode("xml/prepay_id").InnerText;
                    info.trade_type = codeId.SelectSingleNode("xml/trade_type").InnerText;

                    string timestamp = WeChatPayHelper.GetTimeStamp();
                    var res = new Dictionary<string, object>
                    {
                        {"appId", info.appid },
                        {"nonceStr", info.nonce_str},
                        {"timeStamp",timestamp},
                        {"signType","MD5"},
                        {"package","prepay_id="+info.prepay_id}
                    };
                    info.sign = WeChatPayHelper.GetSignString(res);

                    info.timeStamp = timestamp;
                    return View(info);
                }
            }
            catch (Exception e)
            {
                CreateLog.SaveLogs(e.Message, 0);
                return Redirect("WeChatSite/WeChatPay/VisaPay?OrderGuid=" + OrderGuid);
            }

        }