前言：
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一、获取微信支付码url
(1)获取微信支付码url主方法
/// <summary> /// 获取微信支付二维码 /// </summary> /// <param name="log">日志</param> /// <param name="orderId">订单编号</param> /// <returns></returns> public static string GetPayUrl(string orderId, decimal totalPrice) { //errMsg = ""; //Log4Net.Log4Net.Info(log, "订单号:" + orderId + "发起Native的第二种支付方式"); WxPayData data = new WxPayData(); data.SetValue("body", "");//商品描述 data.SetValue("attach", "");//附加数据 data.SetValue("out_trade_no", orderId);//随机字符串 data.SetValue("total_fee", Convert.ToInt32(totalPrice * 100));//总金额 data.SetValue("time_start", DateTime.Now.ToString("yyyyMMddHHmmss"));//交易起始时间 data.SetValue("time_expire", DateTime.Now.AddMinutes(30).ToString("yyyyMMddHHmmss"));//交易结束时间，前端二维码有效期半小时 data.SetValue("goods_tag", "");//商品标记(可根据业务随便填) data.SetValue("trade_type", "NATIVE");//交易类型 data.SetValue("product_id", orderId);//商品ID WxPayData result = WxPayApi.UnifiedOrder(data);//调用统一下单接口 string url = string.Empty; if (result.GetValue("return_code").ToString() == "SUCCESS") { if (result.GetValue("result_code").ToString() == "SUCCESS") { url = result.GetValue("code_url").ToString();//获得统一下单接口返回的二维码链接 } else { //errMsg = result.GetValue("err_code_des").ToString(); } } else { //errMsg = result.GetValue("return_msg").ToString(); } //Log4Net.Log4Net.Info(log, "订单号:" + orderId + "发起Native的第二种支付方式,生成支付链接:" + url); return url; }(2)支付辅助类
/** * * 统一下单 * @param WxPaydata inputObj 提交给统一下单API的参数 * @param int timeOut 超时时间 * @throws WxPayException * @return 成功时返回，其他抛异常 */ public static WxPayData UnifiedOrder(WxPayData inputObj, int timeOut = 6) { string url = ";; //检测必填参数 if (!inputObj.IsSet("out_trade_no")) { throw new Exception("缺少统一支付接口必填参数out_trade_no！"); } else if (!inputObj.IsSet("body")) { throw new Exception("缺少统一支付接口必填参数body！"); } else if (!inputObj.IsSet("total_fee")) { throw new Exception("缺少统一支付接口必填参数total_fee！"); } else if (!inputObj.IsSet("trade_type")) { throw new Exception("缺少统一支付接口必填参数trade_type！"); } //关联参数 if (inputObj.GetValue("trade_type").ToString() == "JSAPI" && !inputObj.IsSet("openid")) { throw new Exception("统一支付接口中，缺少必填参数openid！trade_type为JSAPI时，openid为必填参数！"); } if (inputObj.GetValue("trade_type").ToString() == "NATIVE" && !inputObj.IsSet("product_id")) { throw new Exception("统一支付接口中，缺少必填参数product_id！trade_type为JSAPI时，product_id为必填参数！"); } //异步通知url未设置，则使用配置文件中的url if (!inputObj.IsSet("notify_url")) { inputObj.SetValue("notify_url", WxPayConfig.GetConfig().GetNotifyUrl());//异步通知url } inputObj.SetValue("appid", WxPayConfig.GetConfig().GetAppID());//appID inputObj.SetValue("mch_id", WxPayConfig.GetConfig().GetMchID());//商户号 inputObj.SetValue("spbill_create_ip", WxPayConfig.GetConfig().GetIp());//终端ip inputObj.SetValue("nonce_str", GenerateNonceStr());//随机字符串 inputObj.SetValue("sign_type", WxPayData.SIGN_TYPE_HMAC_SHA256);//签名类型 //签名 inputObj.SetValue("sign", inputObj.MakeSign()); string xml = inputObj.ToXml(); var start = DateTime.Now; //Log4Net.Log4Net.Info(log, "WX UnfiedOrder request : " + xml); string response = HttpService.Post(xml, url, false, timeOut); //Log4Net.Log4Net.Info(log, "WX UnfiedOrder response : " + response); var end = DateTime.Now; int timeCost = (int)((end - start).TotalMilliseconds); WxPayData result = new WxPayData(); result.FromXml(response); ReportCostTime(url, timeCost, result);//测速上报 return result; }public class WxPayData { public const string SIGN_TYPE_MD5 = "MD5"; public const string SIGN_TYPE_HMAC_SHA256 = "HMAC-SHA256"; public WxPayData() { } //采用排序的Dictionary的好处是方便对数据包进行签名，不用再签名之前再做一次排序 private SortedDictionary<string, object> m_values = new SortedDictionary<string, object>(); /** * 设置某个字段的值 * @param key 字段名 * @param value 字段值 */ public void SetValue(string key, object value) { m_values[key] = value; } /** * 根据字段名获取某个字段的值 * @param key 字段名 * @return key对应的字段值 */ public object GetValue(string key) { object o = null; m_values.TryGetValue(key, out o); return o; } /** * 判断某个字段是否已设置 * @param key 字段名 * @return 若字段key已被设置，则返回true，否则返回false */ public bool IsSet(string key) { object o = null; m_values.TryGetValue(key, out o); if (null != o) return true; else return false; } /** * @将Dictionary转成xml * @return 经转换得到的xml串 * @throws WxPayException **/ public string ToXml() { //数据为空时不能转化为xml格式 if (0 == m_values.Count) { throw new Exception("WxPayData数据为空!"); } string xml = "<xml>"; foreach (KeyValuePair<string, object> pair in m_values) { //字段值不能为null，会影响后续流程 if (pair.Value == null) { throw new Exception("WxPayData内部含有值为null的字段!"); } if (pair.Value.GetType() == typeof(int)) { xml += "<" + pair.Key + ">" + pair.Value + "</" + pair.Key + ">"; } else if (pair.Value.GetType() == typeof(string)) { xml += "<" + pair.Key + ">" + "<![CDATA[" + pair.Value + "]]></" + pair.Key + ">"; } else//除了string和int类型不能含有其他数据类型 { throw new Exception("WxPayData字段数据类型错误!"); } } xml += "</xml>"; return xml; } /** * @将xml转为WxPayData对象并返回对象内部的数据 * @param string 待转换的xml串 * @return 经转换得到的Dictionary * @throws WxPayException */ public SortedDictionary<string, object> FromXml(string xml) { if (string.IsNullOrEmpty(xml)) { throw new Exception("将空的xml串转换为WxPayData不合法!"); } XmlDocument xmlDoc = new XmlDocument(); xmlDoc.LoadXml(xml); XmlNode xmlNode = xmlDoc.FirstChild;//获取到根节点<xml> XmlNodeList nodes = xmlNode.ChildNodes; foreach (XmlNode xn in nodes) { XmlElement xe = (XmlElement)xn; m_values[xe.Name] = xe.InnerText;//获取xml的键值对到WxPayData内部的数据中 } try { //2015-06-29 错误是没有签名 if (m_values["return_code"] != "SUCCESS") { return m_values; } CheckSign();//验证签名,不通过会抛异常 } catch (Exception ex) { throw new Exception(ex.Message); } return m_values; } /** * @Dictionary格式转化成url参数格式 * @ return url格式串, 该串不包含sign字段值 */ public string ToUrl() { string buff = ""; foreach (KeyValuePair<string, object> pair in m_values) { if (pair.Value == null) { throw new Exception("WxPayData内部含有值为null的字段!"); } if (pair.Key != "sign" && pair.Value.ToString() != "") { buff += pair.Key + "=" + pair.Value + "&"; } } buff = buff.Trim('&'); return buff; } /** * @Dictionary格式化成Json * @return json串数据 */ public string ToJson() { //string jsonStr = JsonMapper.ToJson(m_values); //return jsonStr; return ""; } /** * @values格式化成能在Web页面上显示的结果（因为web页面上不能直接输出xml格式的字符串） */ public string ToPrintStr() { string str = ""; foreach (KeyValuePair<string, object> pair in m_values) { if (pair.Value == null) { throw new Exception("WxPayData内部含有值为null的字段!"); } str += string.Format("{0}={1}\n", pair.Key, pair.Value.ToString()); } str = HttpUtility.HtmlEncode(str); return str; } /** * @生成签名，详见签名生成算法 * @return 签名, sign字段不参加签名 */ public string MakeSign(string signType) { //转url格式 string str = ToUrl(); //在string后加入API KEY str += "&key=" + WxPayConfig.GetConfig().GetKey(); if (signType == SIGN_TYPE_MD5) { var md5 = MD5.Create(); var bs = md5.ComputeHash(Encoding.UTF8.GetBytes(str)); var sb = new StringBuilder(); foreach (byte b in bs) { sb.Append(b.ToString("x2")); } //所有字符转为大写 return sb.ToString().ToUpper(); } else if (signType == SIGN_TYPE_HMAC_SHA256) { return CalcHMACSHA256Hash(str, WxPayConfig.GetConfig().GetKey()); } else { throw new Exception("sign_type 不合法"); } } /** * @生成签名，详见签名生成算法 * @return 签名, sign字段不参加签名 SHA256 */ public string MakeSign() { return MakeSign(SIGN_TYPE_HMAC_SHA256); } /** * * 检测签名是否正确 * 正确返回true，错误抛异常 */ public bool CheckSign(string signType) { //如果没有设置签名，则跳过检测 if (!IsSet("sign")) { throw new Exception("WxPayData签名存在但不合法!"); } //如果设置了签名但是签名为空，则抛异常 else if (GetValue("sign") == null || GetValue("sign").ToString() == "") { throw new Exception("WxPayData签名存在但不合法!"); } //获取接收到的签名 string return_sign = GetValue("sign").ToString(); //在本地计算新的签名 string cal_sign = MakeSign(signType); if (cal_sign == return_sign) { return true; } throw new Exception("WxPayData签名验证错误!"); } /** * * 检测签名是否正确 * 正确返回true，错误抛异常 */ public bool CheckSign() { return CheckSign(SIGN_TYPE_HMAC_SHA256); } /** * @获取Dictionary */ public SortedDictionary<string, object> GetValues() { return m_values; } private string CalcHMACSHA256Hash(string plaintext, string salt) { string result = ""; var enc = Encoding.Default; byte[] baText2BeHashed = enc.GetBytes(plaintext), baSalt = enc.GetBytes(salt); System.Security.Cryptography.HMACSHA256 hasher = new HMACSHA256(baSalt); byte[] baHashedText = hasher.ComputeHash(baText2BeHashed); result = string.Join("", baHashedText.ToList().Select(b => b.ToString("x2")).ToArray()); return result; } } /** * 生成随机串，随机串包含字母或数字 * @return 随机串 */ public static string GenerateNonceStr() { RandomGenerator randomGenerator = new RandomGenerator(); return randomGenerator.GetRandomUInt().ToString(); }public class RandomGenerator { readonly RNGCryptoServiceProvider csp; public RandomGenerator() { csp = new RNGCryptoServiceProvider(); } public int Next(int minValue, int maxExclusiveValue) { if (minValue >= maxExclusiveValue) throw new ArgumentOutOfRangeException("minValue must be lower than maxExclusiveValue"); long diff = (long)maxExclusiveValue - minValue; long upperBound = uint.MaxValue / diff * diff; uint ui; do { ui = GetRandomUInt(); } while (ui >= upperBound); return (int)(minValue + (ui % diff)); } public uint GetRandomUInt() { var randomBytes = GenerateRandomBytes(sizeof(uint)); return BitConverter.ToUInt32(randomBytes, 0); } private byte[] GenerateRandomBytes(int bytesNumber) { byte[] buffer = new byte[bytesNumber]; csp.GetBytes(buffer); return buffer; } }二、微信支付结果回调接收
(1)支付回调主接收方法
/// <summary> /// 微信支付回调函数 /// </summary> /// <returns></returns> [HttpPost] [AllowAnonymous] public async Task WxPayNotify() { HttpContext context = _httpContextAccessor.HttpContext; try { WxPayData notifyData = GetNotifyData(context); Log.Information("GetNotifyData finished"); //检查支付结果中transaction_id是否存在 if (!notifyData.IsSet("transaction_id")) { //若transaction_id不存在，则立即返回结果给微信支付后台 WxPayData res = new WxPayData(); res.SetValue("return_code", "FAIL"); res.SetValue("return_msg", "支付结果中微信订单号不存在"); await context.Response.WriteAsync(res.ToXml()); } string transaction_id = notifyData.GetValue("transaction_id").ToString(); string out_trade_no = notifyData.GetValue("out_trade_no").ToString(); //查询订单，判断订单真实性 if (!QueryOrder(transaction_id)) { //若订单查询失败，则立即返回结果给微信支付后台 WxPayData res = new WxPayData(); res.SetValue("return_code", "FAIL"); res.SetValue("return_msg", "订单查询失败"); await context.Response.WriteAsync(res.ToXml()); } //查询订单成功 else { //判断订单号和支付金额是否和数据库中一致 //修改订单状态，插入支付payment信息 string result_code = notifyData.GetValue("result_code").ToString(); string openid = notifyData.GetValue("openid").ToString(); string trade_type = notifyData.GetValue("trade_type").ToString(); string bank_type = notifyData.GetValue("bank_type").ToString(); int total_fee = Convert.ToInt32(notifyData.GetValue("total_fee")); int cash_fee = Convert.ToInt32(notifyData.GetValue("cash_fee")); string time_end = notifyData.GetValue("time_end").ToString(); Log.Information($"out_trade_no is {out_trade_no}"); var orderInfo = await _orderRepository.FindAsync(item => item.OrderNumber.ToString() == out_trade_no); if (orderInfo == null) { //若订单查询失败，则立即返回结果给微信支付后台 WxPayData res = new WxPayData(); res.SetValue("return_code", "FAIL"); res.SetValue("return_msg", "商户订单不存在"); await context.Response.WriteAsync(res.ToXml()); } Log.Information($"total_fee is {total_fee}"); Log.Information($"DiscountPrice*100 is {orderInfo.DiscountPrice * 100}"); if (orderInfo.DiscountPrice * 100 != total_fee)//订单支付金额不一致 { WxPayData res = new WxPayData(); res.SetValue("return_code", "FAIL"); res.SetValue("return_msg", "订单支付金额不一致"); await context.Response.WriteAsync(res.ToXml()); } if (orderInfo.PayStatus == PayStatus.Success && orderInfo.DiscountPrice * 100 == total_fee)//订单已支付 { WxPayData res = new WxPayData(); res.SetValue("return_code", "SUCCESS"); res.SetValue("return_msg", "OK"); await context.Response.WriteAsync(res.ToXml()); } else { //该部分主要是一些自定义逻辑了，可以根据自己的业务需求设置； WXPayResult wPay = new WXPayResult(); wPay.OpenId = openid; wPay.TradeState = result_code; wPay.BankType = bank_type; wPay.TotalFee = total_fee; wPay.CashFee = cash_fee; wPay.TransactionId = transaction_id; wPay.TimeEnd = time_end; wPay = await _wXPayResultRepository.InsertAsync(wPay, true); if (null != wPay) { OrderWXPaymentMapping mapping = new OrderWXPaymentMapping(); mapping.OrderNumber = orderInfo.OrderNumber; mapping.WXPayResultId = wPay.Id; mapping = await _orderWXPaymentRepository.InsertAsync(mapping, true); if (mapping != null) { Order orderEntity = null; if (result_code == "SUCCESS") { orderInfo.PayStatus = PayStatus.Success; orderEntity = await _orderRepository.UpdateAsync(orderInfo, true);//10001支付成功 } else { orderInfo.PayStatus = PayStatus.Fail; orderEntity = await _orderRepository.UpdateAsync(orderInfo, true); ;//10002支付失败 } if (orderEntity != null) { WxPayData res = new WxPayData(); res.SetValue("return_code", "SUCCESS"); res.SetValue("return_msg", "OK"); await context.Response.WriteAsync(res.ToXml()); } else { //若订单查询失败，则立即返回结果给微信支付后台 WxPayData res = new WxPayData(); res.SetValue("return_code", "FAIL"); res.SetValue("return_msg", "商户订单处理失败"); await context.Response.WriteAsync(res.ToXml()); } } else { //若订单查询失败，则立即返回结果给微信支付后台 WxPayData res = new WxPayData(); res.SetValue("return_code", "FAIL"); res.SetValue("return_msg", "商户订单处理失败"); await context.Response.WriteAsync(res.ToXml()); } } else { //若订单查询失败，则立即返回结果给微信支付后台 WxPayData res = new WxPayData(); res.SetValue("return_code", "FAIL"); res.SetValue("return_msg", "商户订单处理失败"); await context.Response.WriteAsync(res.ToXml()); } } } } catch (Exception ex) { Log.Information($"WxPayNotify error message is {ex.Message}"); //若订单查询失败，则立即返回结果给微信支付后台 WxPayData res = new WxPayData(); res.SetValue("return_code", "FAIL"); res.SetValue("return_msg", "商户订单处理失败"); await context.Response.WriteAsync(res.ToXml()); var currentInfo = MethodBase.GetCurrentMethod(); //Log4Net.Error(log, ex.Message, currentInfo.ReflectedType.FullName + "-" + currentInfo.Name); } }(2)辅助方法
/// <summary> /// 接收从微信支付后台发送过来的数据并验证签名 /// </summary> /// <returns>微信支付后台返回的数据</returns> public WxPayData GetNotifyData(HttpContext context) { string message = string.Empty; context.Request.EnableBuffering(); context.Request.Body.Seek(0, SeekOrigin.Begin); Log.Information(context.Request.Method); using (var reader = new StreamReader(context.Request.Body, Encoding.UTF8)) { message = reader.ReadToEndAsync().Result; } Log.Information($"context result is {message}"); //Log4Net.Info(log, $"GetNotifyData Receive data from WeChat :{message}"); //转换数据格式并验证签名 WxPayData data = new WxPayData(); try { data.FromXml(message); } catch (Exception ex) { //若签名错误，则立即返回结果给微信支付后台 WxPayData res = new WxPayData(); res.SetValue("return_code", "FAIL"); res.SetValue("return_msg", ex.Message); context.Response.WriteAsync(res.ToXml()); } //Log4Net.Info(log, $"GetNotifyData Check sign success"); return data; }提示:
* APPID：绑定支付的APPID（必须配置）
* MCHID：商户号（必须配置）
* KEY：商户支付密钥，参考开户邮件设置（必须配置），请妥善保管，避免密钥泄露
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标签： #微信支付订单号算法怎么算 #微信支付订单号代表什么
