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  • asp.net core 微信APP支付(扫码支付,H5支付,公众号支付,app支付)之4

      微信app支付需要以下参数,类封装如下

    public class WxPayModel
        {
            /// <summary>
            /// 应用ID
            /// </summary>
            public string appid { set; get; } = "";
            /// <summary>
            /// 商户号
            /// </summary>
            public string partnerid{ set; get; } = "";
            /// <summary>
            /// 预支付交易会话ID
            /// </summary>
            public string prepayid { set; get; } = "";
            /// <summary>
            /// 扩展字段
            /// </summary>
            public string package { set; get; } = "Sign=WXPay";
            /// <summary>
            /// 随机字符串
            /// </summary>
            public string noncestr { set; get; } = "";
            /// <summary>
            /// 时间戳
            /// </summary>
            public string timestamp { set; get; } = "";
    
            /// <summary>
            /// 签名
            /// </summary>
            public string sign { set; get; } = "";
        }

      支付业务逻辑类如下,只需要传递订单号out_trade_no,描述body,价格total_fee,客户端ip,返回一个WxPayModel供app端调用。

    /// <summary>
            /// 获取微信APP支付需要的信息
            /// </summary>
            /// <param name="out_trade_no">订单号</param>
            /// <param name="body">描述</param>
            /// <param name="total_fee">总价</param>
            /// <param name="ip">客户IP</param>
            /// <returns></returns>
            public WxPayModel GetWxAppPayInfo(string out_trade_no, string body, string total_fee, string ip)
            {
                //构造返回内容,缺少prepayid和sign需要去微信服务器获取
                WxPayModel wxPayModel = new WxPayModel()
                {
                    appid = wxPayConfig.appid,
                    partnerid = wxPayConfig.mchid,
                    timestamp = Senparc.Weixin.Helpers.DateTimeHelper.GetWeixinDateTime(DateTime.Now) + "",
                    noncestr = TenPayV3Util.GetNoncestr(),
                };
    
                //构造请求参数
                Senparc.Weixin.MP.TenPayLibV3.RequestHandler packageReqHandler = new Senparc.Weixin.MP.TenPayLibV3.RequestHandler();
    
                #region 构造请求参数
                packageReqHandler.SetParameter("appid", wxPayConfig.appid);//APPID
                packageReqHandler.SetParameter("mch_id", wxPayConfig.mchid);//商户号
                packageReqHandler.SetParameter("nonce_str", Senparc.Weixin.MP.TenPayLibV3.TenPayV3Util.GetNoncestr());//随机串
                packageReqHandler.SetParameter("body", body);
                packageReqHandler.SetParameter("out_trade_no", out_trade_no);//订单号
                packageReqHandler.SetParameter("total_fee", (int)(Convert.ToDecimal(total_fee) * 100) + ""); //金额,以分为单位
                packageReqHandler.SetParameter("spbill_create_ip", ip);//IP
                packageReqHandler.SetParameter("notify_url", wxPayConfig.notify_url); //回调地址
                packageReqHandler.SetParameter("trade_type", "APP");//APP支付
    
                packageReqHandler.SetParameter("sign", packageReqHandler.CreateMd5Sign("key", wxPayConfig.key));//商户API密钥(签名) 
                #endregion
    
                //将参数转为xml字符串
                string data = packageReqHandler.ParseXML();
                //发起post异步请求,获取返回的内容
                var result = PostWithStringFile(wxPayConfig.api_url, data);
    
                Log.Info("【GetWxAppPayInfo】订单:" + out_trade_no + ",请求得到的xml:" + result, "微信支付");
    
                var res = System.Xml.Linq.XDocument.Parse(result);//解析xml,为了填充prepay_id参数和_paySign参数。
                try
                {
                    //填充prepay_id参数
                    wxPayModel.prepayid = res.Element("xml").Element("prepay_id").Value;
    
                    SortedDictionary<string, object> sParams = new SortedDictionary<string, object>();

              sParams.Add("appid", wxPayModel.appid);
              sParams.Add("noncestr", wxPayModel.noncestr);
              sParams.Add("package", "Sign=WXPay");
              sParams.Add("partnerid", wxPayModel.partnerid);
              sParams.Add("prepayid", wxPayModel.prepayid);
              sParams.Add("timestamp", wxPayModel.timestamp);

    //填充sign参数 
                    wxPayModel.sign = GetSign(sParams, wxPayConfig.key);
                }
                catch (Exception ex)
                {
                    Log.Info($"【GetWxAppPayInfo】订单:{out_trade_no },异常:{ ex.ToString()}", "微信支付");
                }
                return wxPayModel;
            }

      其中获取微信签名方法如下

    #region 获取微信签名
            /// <summary>
            /// 获取微信签名
            /// </summary>
            /// <param name="sParams"></param>
            /// <returns></returns>
            public string GetSign(SortedDictionary<string, object> sParams, string key)
            {
                string sign = string.Empty;
                StringBuilder sb = new StringBuilder();
                foreach (KeyValuePair<string, object> temp in sParams)
                {
                    if (string.IsNullOrEmpty(temp.Value +"") || temp.Key.ToLower() == "sign")
                    {
                        continue;
                    }
                    sb.Append(temp.Key.Trim() + "=" + temp.Value.ToString() + "&");
                }
                sb.Append("key=" + key.Trim() + "");
                string signkey = sb.ToString();
                sign = Senparc.Weixin.Helpers.EncryptHelper.GetMD5(signkey);
                return sign;
            }
    
            #endregion

      这样只要应用开通了微信app支付功能,就能正确返回app sdk支付所需要的数据。

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  • 原文地址:https://www.cnblogs.com/jomzhang/p/9213928.html
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