.NET微信扫码支付接入（模式二-NATIVE）

 /// <summary> /// 获取二维码 /// </summary> /// <param name="orderNumber"></param> /// <returns></returns> public string GetCodeUrl(string orderNumber) {  var result = string.Empty;  if (!string.IsNullOrEmpty(orderNumber))  {  var matchedItem = db.OrderInfoForProducts.FirstOrDefault(x => x.OrderNumber == orderNumber);  if (matchedItem != null && matchedItem.IsPaid == false)  {   WxPayData data = new WxPayData();   data.SetValue("body", "productBody");//商品描述   data.SetValue("attach", "attach data");//附加数据   data.SetValue("out_trade_no", WxPayApi.GenerateOutTradeNo());//随机字符串   data.SetValue("total_fee", price);//总金额   data.SetValue("time_start", DateTime.Now.ToString("yyyyMMddHHmmss"));//交易起始时间   data.SetValue("time_expire", DateTime.Now.AddMinutes(10).ToString("yyyyMMddHHmmss"));//交易结束时间   data.SetValue("goods_tag", "tag");//商品标记   data.SetValue("trade_type", "NATIVE");//交易类型   data.SetValue("product_id", WxPayApi.GenerateOutTradeNo());//商品ID   result = WxPayApi.UnifiedOrder(data).GetValue("code_url").ToString();//调用统一下单接口  }  }  return result; }

 /// <summary> /// 根据字符串得到相应的二维码 /// </summary> /// <param name="qrInfo"></param> /// <param name="productName"></param> /// <param name="version"></param> /// <returns></returns> public static Image CreateQRCodeImage(string qrInfo, string productName, string version) {  try  {  if (!string.IsNullOrEmpty(qrInfo))  {   QRCodeEncoder encoder = new QRCodeEncoder   {   QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE,   QRCodeScale = 4,   QRCodeVersion = 0,   QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M   };   //编码方式(注意：BYTE能支持中文，ALPHA_NUMERIC扫描出来的都是数字)   //大小(值越大生成的二维码图片像素越高)   //版本(注意：设置为0主要是防止编码的字符串太长时发生错误)   //错误效验、错误更正(有4个等级)   Image image = encoder.Encode(qrInfo, Encoding.GetEncoding("utf-8"));   string filename = $"{productName}_{version}.png";   var userLocalPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);   var docPath = Path.Combine(userLocalPath, @"Your Product/QRCode");   if (!Directory.Exists(docPath))   {   Directory.CreateDirectory(docPath);   }   string filepath = Path.Combine(docPath, filename);    using (FileStream fs = new FileStream(filepath, FileMode.OpenOrCreate, FileAccess.Write))   {   image.Save(fs, System.Drawing.Imaging.ImageFormat.Png);   fs.Close();   image.Dispose();   }   return image;  }  }  catch (Exception)  {  return null;  }  return null; }

 /// <summary> /// 回调函数 /// </summary> public ActionResult UpdatePayStatus() {  //接收从微信后台POST过来的数据  System.IO.Stream s = Request.InputStream;  int count = 0;  byte[] buffer = new byte[1024];  StringBuilder builder = new StringBuilder();  while ((count = s.Read(buffer, 0, 1024)) > 0)  {  builder.Append(Encoding.UTF8.GetString(buffer, 0, count));  }  s.Flush();  s.Close();  s.Dispose();  //转换数据格式并验证签名  WxPayData data = new WxPayData();  try  {  data.FromXml(builder.ToString());  }  catch (WxPayException 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);  LogEntity signErrorLog = new LogEntity();  signErrorLog.errorMessage = ex.Message;  LogHelper.WriteLog(signErrorLog, null);  Response.Write(res.ToXml());  Response.End();  }  ProcessNotify(data);    return View(); } /// <summary> /// 处理回调数据 /// </summary> /// <param name="data"></param> public void ProcessNotify(WxPayData data) {  WxPayData notifyData = data;  //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");  LogEntity orderLog = new LogEntity();  orderLog.errorMessage = "支付结果中微信订单号不存在";  LogHelper.WriteLog(orderLog, null);  Response.Write(res.ToXml());  Response.End();  }  string transaction_id = notifyData.GetValue("transaction_id").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");  LogEntity orderqueryLog = new LogEntity();  orderqueryLog.errorMessage = "订单查询失败";  LogHelper.WriteLog(orderqueryLog, null);  Response.Write(res.ToXml());  Response.End();  }  //查询订单成功  else  {  WxPayData res = new WxPayData();  res.SetValue("return_code", "SUCCESS");  res.SetValue("return_msg", "OK");  SetPaymentResult(data); //这里的参数是 data ！！！ 不是 res ！！！  Response.Write(res.ToXml());  Response.End();  } } /// <summary> /// 商户后台更新 /// </summary> /// <param name="res"></param> private void SetPaymentResult(WxPayData res) {  var isSucessFlagOne = res.GetValue("return_code").ToString();  var isSuccessFlagTwo = res.GetValue("result_code").ToString();    if (isSucessFlagOne == "SUCCESS" && isSuccessFlagTwo == "SUCCESS")  {  //自己的业务逻辑 ！！！！  } } //查询订单 private bool QueryOrder(string transaction_id) {  WxPayData req = new WxPayData();  req.SetValue("transaction_id", transaction_id);  WxPayData res = WxPayApi.OrderQuery(req);  if (res.GetValue("return_code").ToString() == "SUCCESS" &&  res.GetValue("result_code").ToString() == "SUCCESS")  {  return true;  }  else  {  return false;  } }