.NET微信支付集成实例

微信端HTML页面下单事件：

document.getElementById('btn-wxpay')addEventListener('tap', function (e) {  //创建订单  $.post('/Orders/Create', orderdata, function(result){    //创建订单成功    if (result.status == 'success') {      //开始调用微信JS API支付接口      WeixinJSBridge.invoke('getBrandWCPayRequest', JSON.parse(result.data), function (res) {        //支付成功，重定向只支付页面        if (res.err_msg == 'get_brand_wcpay_request:ok') {          window.location.href = '/Orders/CreateSuccess/' + result.orderId;        } else {          //支付失败，提示错误原因，重定向至订单详情页面          if (res.err_msg == 'get_brand_wcpay_request:cancel') {            alert('支付过程中用户取消');          } else if (res.err_msg == 'get_brand_wcpay_request:fail') {            alert('支付失败');          } else {            alert(res.err_msg);          }          window.location.href = '/Orders/Details/' + result.orderId;        }      });    }else{      //创建订单失败，提示错误      alert(result.error);    }  });}

服务端对应处理模块：

//创建订单，同时对订单进行预支付public ActionResult Create(OrderCreateViewModel model){  try{    using(var db = new MyDbEntities()){      db.Orders.Add(new Order(){ Name = model.Name, Weight = model.Weight, OrderTotal = model.OrderTotal, OrderStatus = WaitBuyerPay, Gateway = 'wxpay' });      db.SaveChanges();      return Json(new { status = "success", orderId = order.OrderId, data = GetJsBrandWCPayRequestApiParameters(order.Name, order.Name, (int)(order.OrderTotal * 100), 'openId')});    }  }catch (Exception ex){    return Json(new { status = "error", error = ex.Message });  }}//生成微信JS API支付接口参数public string GetJsBrandWCPayRequestApiParameters(string body, string out_trade_no, int total_fee, string openid){  var parameters = new Dictionary<string string="">();  parameters.Add("appId", 'wx0000000000000000');  parameters.Add("timeStamp", 'timeStamp');  parameters.Add("nonceStr", 'nonceStr');  //获取预支付订单号  parameters.Add("package", string.Format("prepay_id={0}", GetPrepayId('wx0000000000000000', '0000000000', '000000000000000', 'nonceStr', body, out_trade_no, total_fee, openid)));  parameters.Add("signType", "MD5");  parameters.Add("paySign", GetPaySign(parameters, '000000000000000'));  return JsonConvert.SerializeObject(parameters);}//获取预支付订单号public static string GetPrepayId(string appId, string mchId, string mchKey, string nonceStr, string body, string out_trade_no, int total_fee, string openid){  HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("https://api.mch.weixin.qq.com/pay/unifiedorder");  myRequest.Method = "POST";  myRequest.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";  myRequest.Accept = "application/json";  var formQuery = GetUnifiedOrderApiParameters(appId, mchId, mchKey, nonceStr, body, out_trade_no, total_fee, openid);  using (var sw = new StreamWriter(myRequest.GetRequestStream())){    sw.Write(formQuery);  }  string responseText = string.Empty;  using (HttpWebResponse response = (HttpWebResponse)myRequest.GetResponse()){    using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8)){      responseText = reader.ReadToEnd().ToString();    }  }  var doc = XDocument.Parse(responseText);  if (doc.Root.Element("return_code").Value == "FAIL" || doc.Root.Element("result_code").Value == "FAIL"){    if (doc.Root.Element("err_code") != null)      throw new WeixinPayException(doc.Root.Element("err_code").Value, doc.Root.Element("err_code_des").Value);    else      throw new Exception(doc.Root.Element("return_msg").Value);  }else{    return doc.Root.Element("prepay_id").Value;  }}</string>

通用通知接口处理模块：

public ActionResult Notify()        {            //读取从客户端发出的原始数据并解码            var xml = System.Text.Encoding.UTF8.GetString(Request.BinaryRead(Request.TotalBytes));            if (!string.IsNullOrEmpty(xml))            {                //解析为XML文档实例                var doc = XDocument.Parse(xml);                var originalSign = doc.Root.Element("sign").Value;                var parameters = doc.Root.Elements().Where(m => m.Name != "sign").ToDictionary(m => m.Name.LocalName, m => m.Value);                //签名验证                var sign = GetPaySign(parameters, "MchKey");                var returnDic = new Dictionary<string, string>();                if (sign != originalSign)                {                    Log.Error("签名失败：" + String.Join(";", parameters.Select(m => m.Key + ":" + m.Value).ToArray()));                    returnDic.Add("return_code", "FAIL");                    returnDic.Add("return_msg", "签名失败");                }                else                {                    returnDic.Add("return_code", "SUCCESS");                }                //返回处理结果给微信                Response.Write(WeixinSDK.DictionaryToXML(returnDic));                //业务处理                if (sign == originalSign)                {                    if (parameters["return_code"] == "FAIL")                    {                        Log.Error("通信出错：" + String.Join(";", parameters.Select(m => m.Key + ":" + m.Value)));                    }                    else if (parameters["result_code"] == "FAIL")                    {                        Log.Error("业务出错：" + String.Join(";", parameters.Select(m => m.Key + ":" + m.Value)));                    }                    else                    {                        Log.Info("支付成功：" + String.Join(";", parameters.Select(m => m.Key + ":" + m.Value)));                        var request = new WeixinPayNotifyRequest()                        {                            transaction_id = parameters["transaction_id"],                            out_trade_no = parameters["out_trade_no"]                        };                        //最终对该笔交易进行确认                        ConfirmPay(request.out_trade_no, request.transaction_id);                    }                }            }            return Content(string.Empty);        }