C#微信退费

C#微信退费全过程

//调用退费
 public void WeChatRefund(string total_fee，string refund_fee，string transaction_id){
  				string totalfee= (float.Parse(total_fee) * 100).ToString();//订单总价
                string refundfee= (float.Parse(refund_fee) * 100).ToString();//退费金额
                string res = RefundRun(transaction_id, "", totalfee, refundfee);//调用退费方法
                if (res.Contains("return_msg=OK")){
                //退费成功
                }
                else{
                //退费失败
                }
   }
     /***
	   * 申请退款完整业务流程逻辑
	     * @param transaction_id 微信订单号（优先使用）
	     * @param out_trade_no 商户订单号
	     * @param total_fee 订单总金额
	     * @param refund_fee 退款金额
	     * @return 退款结果（xml格式）
	     */
	     public static string RefundRun(string transaction_id, string out_trade_no, string total_fee, string refund_fee)
	     {
	         Log.Info("Refund", "Refund is processing...");
	
	         WxPayData data = new WxPayData();
	         if (!string.IsNullOrEmpty(transaction_id))//微信订单号存在的条件下，则已微信订单号为准
	         {
	             data.SetValue("transaction_id", transaction_id);
	         }
	         else//微信订单号不存在，才根据商户订单号去退款
	         {
	             data.SetValue("out_trade_no", out_trade_no);
	         }
	
	         data.SetValue("total_fee", int.Parse(total_fee));//订单总金额
	         data.SetValue("refund_fee", int.Parse(refund_fee));//退款金额
	         data.SetValue("out_refund_no", WxPayApi.GenerateOutTradeNo());//随机生成商户退款单号
	         data.SetValue("op_user_id", MchID);//操作员，默认为商户号
	
	         WxPayData result = Refund(data);//提交退款申请给API，接收返回数据
	
	         Log.Info("Refund", "Refund process complete, result : " + result.ToXml());
	         return result.ToPrintStr();
	     }
	  /**
        * 
        * 申请退款
        * @param WxPayData inputObj 提交给申请退款API的参数
        * @param int timeOut 超时时间
        * @throws WxPayException
        * @return 成功时返回接口调用结果，其他抛异常
        */
        public static WxPayData Refund(WxPayData inputObj, int timeOut = 6)
        {
            string url = "https://api.mch.weixin.qq.com/secapi/pay/refund";
            //检测必填参数
            if (!inputObj.IsSet("out_trade_no") && !inputObj.IsSet("transaction_id"))
            {
                throw new WxPayException("退款申请接口中，out_trade_no、transaction_id至少填一个！");
            }
            else if (!inputObj.IsSet("out_refund_no"))
            {
                throw new WxPayException("退款申请接口中，缺少必填参数out_refund_no！");
            }
            else if (!inputObj.IsSet("total_fee"))
            {
                throw new WxPayException("退款申请接口中，缺少必填参数total_fee！");
            }
            else if (!inputObj.IsSet("refund_fee"))
            {
                throw new WxPayException("退款申请接口中，缺少必填参数refund_fee！");
            }
            else if (!inputObj.IsSet("op_user_id"))
            {
                throw new WxPayException("退款申请接口中，缺少必填参数op_user_id！");
            }

            inputObj.SetValue("appid",AppID);//公众账号ID
            inputObj.SetValue("mch_id", MchID);//商户号
            inputObj.SetValue("nonce_str", Guid.NewGuid().ToString().Replace("-", ""));//随机字符串
            inputObj.SetValue("sign_type", WxPayData.SIGN_TYPE_MD5);//签名类型
            inputObj.SetValue("sign", inputObj.MakeSign());//签名
            
            string xml = inputObj.ToXml();
            var start = DateTime.Now;

            Log.Debug("WxPayApi", "Refund request : " + xml);
            string response = HttpServiceWeChat.Post(xml, url, true, timeOut);//调用HTTP通信接口提交数据到API
            Log.Debug("WxPayApi", "Refund response : " + response);

            var end = DateTime.Now;
            int timeCost = (int)((end - start).TotalMilliseconds);//获得接口耗时

            //将xml格式的结果转换为对象以返回
            WxPayData result = new WxPayData();
            result.FromXml(response);

            ReportCostTime(url, timeCost, result);//测速上报

            return result;
        }
         public static string Post(string xml, string url, bool isUseCert, int timeout)
        {
            System.GC.Collect();//垃圾回收，回收没有正常关闭的http连接

            string result = "";//返回结果

            HttpWebRequest request = null;
            HttpWebResponse response = null;
            Stream reqStream = null;

            try
            {
                //设置最大连接数
                ServicePointManager.DefaultConnectionLimit = 200;
                //设置https验证方式
                if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
                {
                    ServicePointManager.ServerCertificateValidationCallback =
                            new RemoteCertificateValidationCallback(CheckValidationResult);
                }

                /***************************************************************
                * 下面设置HttpWebRequest的相关属性
                * ************************************************************/
                request = (HttpWebRequest)WebRequest.Create(url);
                request.UserAgent = USER_AGENT;
                request.Method = "POST";
                request.Timeout = timeout * 1000;

                //设置POST的数据类型和长度
                request.ContentType = "text/xml";
                byte[] data = System.Text.Encoding.UTF8.GetBytes(xml);
                request.ContentLength = data.Length;

                //是否使用证书
                if (isUseCert)
                {
                    X509Certificate2 cert = new X509Certificate2(证书路径,密码);
                    request.ClientCertificates.Add(cert);
                    Log.Debug("WxPayApi", "PostXml used cert");
                }

                //往服务器写入数据
                reqStream = request.GetRequestStream();
                reqStream.Write(data, 0, data.Length);
                reqStream.Close();

                //获取服务端返回
                response = (HttpWebResponse)request.GetResponse();

                //获取服务端返回数据
                StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                result = sr.ReadToEnd().Trim();
                sr.Close();
            }
            catch (System.Threading.ThreadAbortException e)
            {
                Log.Error("HttpService", "Thread - caught ThreadAbortException - resetting.");
                Log.Error("Exception message: {0}", e.Message);
                System.Threading.Thread.ResetAbort();
            }
            catch (WebException e)
            {
                Log.Error("HttpService", e.ToString());
                if (e.Status == WebExceptionStatus.ProtocolError)
                {
                    Log.Error("HttpService", "StatusCode : " + ((HttpWebResponse)e.Response).StatusCode);
                    Log.Error("HttpService", "StatusDescription : " + ((HttpWebResponse)e.Response).StatusDescription);
                }
                throw new WxPayException(e.ToString());
            }
            catch (Exception e)
            {
                Log.Error("HttpService", e.ToString());
                throw new WxPayException(e.ToString());
            }
            finally
            {
                //关闭连接和流
                if (response != null)
                {
                    response.Close();
                }
                if(request != null)
                {
                    request.Abort();
                }
            }
            return result;
        }

大体的退费代码就是这些，具体没有体现，接下来是退费发布时遇到的问题
1.“路径正确，一直报系统找不到路径问题”
找到对应应用程序池，将其"高级设置"–“进程模型”–“加载用户配置文件” 设置为true

2.“IIS证书发布问题”
首先将下载的证书导入到服务器或本地。点击证书

win+R 输入MMC，打开MMC

添加证书

完成即可。