微信小程序支付功能 C# .NET开发

微信小程序支付功能的开发的时候坑比较多，不过对于钱的事谨慎也是好事。网上关于小程序支付的实例很多，但是大多多少有些问题，C#开发的更少。此篇文档的目的是讲开发过程中遇到的问题做一个备注，也方便其他开发的同学作为参考！

 

       1、首先建议把官方文档支付部分看上三遍，每个细节都不要放过，因为任何一个点和微信要求不符都会导致支付不成功。https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=3_1

      2、经过验证的微信支付功能，会需要一些商户号、支付秘钥等，不要搞混。

     3、经常遇到的是“签名错误”，请仔细看需要传送的xml参数及取值规则是否符合微信规则。微信有个验证工具可以验证发送的xml字段是否合法。

 

下面上代码：

 

web.config

 

    <add key="ConnectionString" value="server=127.0.0.1;database=;uid=sa;pwd="/> <add key="ConnectionString2" value="server=127.0.0.1;database=codematic2;uid=sa;pwd=1"/> <add key="appid" value=""/>//appid <add key="secret" value=""/>//小程序秘钥 <add key="mch_id" value=""/>//商户号 <add key="key" value=""/>//支付秘钥 <add key="ip" value=""/>//服务器IP <add key="PayResulturl" value=""/>//微信返回接收信息的url地址 </appSettings>

支付后台xiadan.ashx

 

 

<%@ WebHandler Language="C#" Class="xiadan" %> using System; using System.Web; using System.Net; using System.IO; using System.Configuration; using Maticsoft.Model; using Maticsoft.BLL; using System.Security.Cryptography; using System.Text; using System.Xml.Serialization; using System.Xml; using System.Collections.Generic; using System.Data; using System.Net.Security; using System.Security.Cryptography.X509Certificates; using System.Linq; using Newtonsoft.Json; public class xiadan : IHttpHandler { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; string openid = context.Request.Params["openid"]; string ordertime = context.Request.Params["ordertime"]; string appid = ConfigurationManager.AppSettings["appid"]; string secret = ConfigurationManager.AppSettings["secret"]; string key = ConfigurationManager.AppSettings["key"]; string mch_id = ConfigurationManager.AppSettings["mch_id"]; string ip = ConfigurationManager.AppSettings["ip"]; string PayResulturl = ConfigurationManager.AppSettings["PayResulturl"]; string roomid = context.Request.Params["roomid"]; string aa = "-押金";////商品描述交易字段格式根据不同的应用场景按照以下格式：APP——需传入应用市场上的APP名字-实际商品名称，天天爱消除-游戏充值。 string strcode = aa; byte[] buffer = Encoding.UTF8.GetBytes(strcode); string body = Encoding.UTF8.GetString(buffer, 0, buffer.Length); string totalfee = context.Request.Params["totalfee"]; string output = ""; if ((context.Request.Params["openid"] != null) && (context.Request.Params["openid"] != "")) { //OrderInfo order = new OrderInfo(); //order.appid = appid; System.Random Random = new System.Random(); var dic = new Dictionary<string, string> { {"appid", appid}, {"mch_id", mch_id}, {"nonce_str", GetRandomString(20)/*Random.Next().ToString()*/}, {"body",body}, {"out_trade_no",roomid + DateTime.Now.ToString("yyyyMMddHHmmssfff") + Random.Next(999).ToString()},//商户自己的订单号码 {"total_fee",totalfee}, {"spbill_create_ip",ip},//服务器的IP地址 {"notify_url",PayResulturl},//异步通知的地址，不能带参数 {"trade_type","JSAPI" }, {"openid",openid} }; //加入签名 dic.Add("sign", GetSignString(dic)); var sb = new StringBuilder(); sb.Append("<xml>"); foreach (var d in dic) { sb.Append("<" + d.Key + ">" + d.Value + "</" + d.Key + ">"); } sb.Append("</xml>"); var xml = new XmlDocument(); // xml.LoadXml(GetPostString("https://api.mch.weixin.qq.com/pay/unifiedorder", sb.ToString())); CookieCollection coo = new CookieCollection(); Encoding en = Encoding.GetEncoding("UTF-8"); HttpWebResponse response = CreatePostHttpResponse("https://api.mch.weixin.qq.com/pay/unifiedorder", sb.ToString(), en); //打印返回值 Stream stream = response.GetResponseStream(); //获取响应的字符串流 StreamReader sr = new StreamReader(stream); //创建一个stream读取流 string html = sr.ReadToEnd(); //从头读到尾，放到字符串html //Console.WriteLine(html); xml.LoadXml(html); //对请求返回值 进行处理 var root = xml.DocumentElement; DataSet ds = new DataSet(); StringReader stram = new StringReader(html); XmlTextReader reader = new XmlTextReader(stram); ds.ReadXml(reader); string return_code = ds.Tables[0].Rows[0]["return_code"].ToString(); if (return_code.ToUpper() == "SUCCESS") { //通信成功 string result_code = ds.Tables[0].Rows[0]["result_code"].ToString();//业务结果 if (result_code.ToUpper() == "SUCCESS") { var res = new Dictionary<string, string> { {"appId", appid}, {"timeStamp", GetTimeStamp()}, {"nonceStr", dic["nonce_str"]}, {"package", "prepay_id="+ds.Tables[0].Rows[0]["prepay_id"].ToString()}, {"signType", "MD5"} }; //在服务器上签名 res.Add("paySign", GetSignString(res)); // string signapp = res.ToString(); string signapp = JsonConvert.SerializeObject(res); if ((context.Request.Params["openid"] != null) && (context.Request.Params["openid"] != "")) { //存储订单信息 Maticsoft.Model.order_history oh = new Maticsoft.Model.order_history(); //oh.shop_id = oh.room_id = Convert.ToInt32(roomid); oh.pay_price = Convert.ToDecimal(totalfee); oh.out_trade_no = dic["out_trade_no"]; oh.order_timestart = Convert.ToDateTime(ordertime); oh.openid = openid; oh.creating_date = DateTime.Now; Maticsoft.BLL.order_history bll = new Maticsoft.BLL.order_history(); bll.Add(oh); } context.Response.Write(signapp); } } } context.Response.Write(output); } public bool IsReusable { get { return false; } } public string GetMd5Hash(String input) { if (input == null) { return null; } MD5 md5Hash = MD5.Create(); // 将输入字符串转换为字节数组并计算哈希数据 byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input)); // 创建一个 Stringbuilder 来收集字节并创建字符串 StringBuilder sBuilder = new StringBuilder(); // 循环遍历哈希数据的每一个字节并格式化为十六进制字符串 for (int i = 0; i < data.Length; i++) { sBuilder.Append(data[i].ToString()); } // 返回十六进制字符串 return sBuilder.ToString(); } /// <summary> /// 对象序列化成 XML String /// </summary> public static string XmlSerialize<T>(T obj) { string xmlString = string.Empty; XmlSerializer xmlSerializer = new XmlSerializer(typeof(T)); using (MemoryStream ms = new MemoryStream()) { xmlSerializer.Serialize(ms, obj); xmlString = Encoding.UTF8.GetString(ms.ToArray()); } return xmlString; } /// <summary> /// 从字符串里随机得到，规定个数的字符串. /// </summary> /// <param name="allChar"></param> /// <param name="CodeCount"></param> /// <returns></returns> public static string GetRandomString(int CodeCount) { string allChar = "1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,i,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z"; string[] allCharArray = allChar.Split(','); string RandomCode = ""; int temp = -1; Random rand = new Random(); for (int i = 0; i < CodeCount; i++) { if (temp != -1) { rand = new Random(temp * i * ((int)DateTime.Now.Ticks)); } int t = rand.Next(allCharArray.Length - 1); while (temp == t) { t = rand.Next(allCharArray.Length - 1); } temp = t; RandomCode += allCharArray[t]; } return RandomCode; } public static string GetWebClientIp() { string userIP = "IP"; try { if (System.Web.HttpContext.Current == null || System.Web.HttpContext.Current.Request == null || System.Web.HttpContext.Current.Request.ServerVariables == null) return ""; string CustomerIP = ""; //CDN加速后取到的IP CustomerIP = System.Web.HttpContext.Current.Request.Headers["Cdn-Src-Ip"]; if (!string.IsNullOrEmpty(CustomerIP)) { return CustomerIP; } CustomerIP = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; if (!String.IsNullOrEmpty(CustomerIP)) return CustomerIP; if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null) { CustomerIP = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; if (CustomerIP == null) CustomerIP = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; } else { CustomerIP = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; } if (string.Compare(CustomerIP, "unknown", true) == 0) return System.Web.HttpContext.Current.Request.UserHostAddress; return CustomerIP; } catch { } return userIP; } private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; //总是接受 } public static HttpWebResponse CreatePostHttpResponse(string url, string datas, Encoding charset) { HttpWebRequest request = null; //HTTPSQ请求 ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); request = WebRequest.Create(url) as HttpWebRequest; request.ProtocolVersion = HttpVersion.Version10; request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; //如果需要POST数据 //if (!(parameters == null || parameters.Count == 0)) //{ StringBuilder buffer = new StringBuilder(); //int i = 0; //foreach (string key in parameters.Keys) //{ // if (i > 0) // { // buffer.AppendFormat("&{0}={1}", key, parameters[key]); // } // else // { // buffer.AppendFormat("{0}={1}", key, parameters[key]); // } // i++; //} buffer.AppendFormat(datas); byte[] data = charset.GetBytes(buffer.ToString()); using (Stream stream = request.GetRequestStream()) { stream.Write(data, 0, data.Length); } //} return request.GetResponse() as HttpWebResponse; } public string GetSignString(Dictionary<string, string> dic) { string key = System.Web.Configuration.WebConfigurationManager.AppSettings["key"].ToString();//商户平台 API安全里面设置的KEY 32位长度 //排序 dic = dic.OrderBy(d => d.Key).ToDictionary(d => d.Key, d => d.Value); //连接字段 var sign = dic.Aggregate("", (current, d) => current + (d.Key + "=" + d.Value + "&")); sign += "key=" + key; //MD5 // sign = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sign, "MD5").ToUpper(); System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create(); sign = BitConverter.ToString(md5.ComputeHash(Encoding.UTF8.GetBytes(sign))).Replace("-", null); return sign; } /// <summary> /// 获取时间戳 /// </summary> /// <returns></returns> public static string GetTimeStamp() { TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0); return Convert.ToInt64(ts.TotalSeconds).ToString(); } }

 

      微信返回信息接收后台页面notify_url.ashx

 

<%@ WebHandler Language="C#" Class="notify_url" %> using System; using System.Web; using System.Collections.Generic; using System.Data; using System.IO; using System.Text; using System.Xml; using System.Net; public class notify_url : IHttpHandler { public string return_result = ""; public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; context.Response.Write("Hello World"); String xmlData = getPostStr();//获取请求数据 if (xmlData == "") { } else { var dic = new Dictionary<string, string> { {"return_code", "SUCCESS"}, {"return_msg","OK"} }; var sb = new StringBuilder(); sb.Append("<xml>"); foreach (var d in dic) { sb.Append("<" + d.Key + ">" + d.Value + "</" + d.Key + ">"); } sb.Append("</xml>"); //把数据重新返回给客户端 DataSet ds = new DataSet(); StringReader stram = new StringReader(xmlData); XmlTextReader datareader = new XmlTextReader(stram); ds.ReadXml(datareader); if (ds.Tables[0].Rows[0]["return_code"].ToString() == "SUCCESS") { string wx_appid = "";//微信开放平台审核通过的应用APPID string wx_mch_id = "";//微信支付分配的商户号 string wx_nonce_str = "";// 随机字符串，不长于32位 string wx_sign = "";//签名，详见签名算法 string wx_result_code = "";//SUCCESS/FAIL string wx_return_code = ""; string wx_openid = "";//用户在商户appid下的唯一标识 string wx_is_subscribe = "";//用户是否关注公众账号，Y-关注，N-未关注，仅在公众账号类型支付有效 string wx_trade_type = "";// APP string wx_bank_type = "";// 银行类型，采用字符串类型的银行标识，银行类型见银行列表 string wx_fee_type = "";// 货币类型，符合ISO4217标准的三位字母代码，默认人民币：CNY，其他值列表详见货币类型 string wx_transaction_id = "";//微信支付订单号 string wx_out_trade_no = "";//商户系统的订单号，与请求一致。 string wx_time_end = "";// 支付完成时间，格式为yyyyMMddHHmmss，如2009年12月25日9点10分10秒表示为20091225091010。其他详见时间规则 int wx_total_fee = -1;// 订单总金额，单位为分 int wx_cash_fee = -1;//现金支付金额订单现金支付金额，详见支付金额 #region 数据解析 //列 是否存在 string signstr = "";//需要前面的字符串 //wx_appid if (ds.Tables[0].Columns.Contains("appid")) { wx_appid = ds.Tables[0].Rows[0]["appid"].ToString(); if (!string.IsNullOrEmpty(wx_appid)) { signstr += "appid=" + wx_appid; } } //wx_bank_type if (ds.Tables[0].Columns.Contains("bank_type")) { wx_bank_type = ds.Tables[0].Rows[0]["bank_type"].ToString(); if (!string.IsNullOrEmpty(wx_bank_type)) { signstr += "&bank_type=" + wx_bank_type; } } //wx_cash_fee if (ds.Tables[0].Columns.Contains("cash_fee")) { wx_cash_fee = Convert.ToInt32(ds.Tables[0].Rows[0]["cash_fee"].ToString()); signstr += "&cash_fee=" + wx_cash_fee; } //wx_fee_type if (ds.Tables[0].Columns.Contains("fee_type")) { wx_fee_type = ds.Tables[0].Rows[0]["fee_type"].ToString(); if (!string.IsNullOrEmpty(wx_fee_type)) { signstr += "&fee_type=" + wx_fee_type; } } //wx_is_subscribe if (ds.Tables[0].Columns.Contains("is_subscribe")) { wx_is_subscribe = ds.Tables[0].Rows[0]["is_subscribe"].ToString(); if (!string.IsNullOrEmpty(wx_is_subscribe)) { signstr += "&is_subscribe=" + wx_is_subscribe; } } //wx_mch_id if (ds.Tables[0].Columns.Contains("mch_id")) { wx_mch_id = ds.Tables[0].Rows[0]["mch_id"].ToString(); if (!string.IsNullOrEmpty(wx_mch_id)) { signstr += "&mch_id=" + wx_mch_id; } } //wx_nonce_str if (ds.Tables[0].Columns.Contains("nonce_str")) { wx_nonce_str = ds.Tables[0].Rows[0]["nonce_str"].ToString(); if (!string.IsNullOrEmpty(wx_nonce_str)) { signstr += "&nonce_str=" + wx_nonce_str; } } //wx_openid if (ds.Tables[0].Columns.Contains("openid")) { wx_openid = ds.Tables[0].Rows[0]["openid"].ToString(); if (!string.IsNullOrEmpty(wx_openid)) { signstr += "&openid=" + wx_openid; } } //wx_out_trade_no if (ds.Tables[0].Columns.Contains("out_trade_no")) { wx_out_trade_no = ds.Tables[0].Rows[0]["out_trade_no"].ToString(); if (!string.IsNullOrEmpty(wx_out_trade_no)) { signstr += "&out_trade_no=" + wx_out_trade_no; } } //wx_result_code if (ds.Tables[0].Columns.Contains("result_code")) { wx_result_code = ds.Tables[0].Rows[0]["result_code"].ToString(); if (!string.IsNullOrEmpty(wx_result_code)) { signstr += "&result_code=" + wx_result_code; } } //wx_result_code if (ds.Tables[0].Columns.Contains("return_code")) { wx_return_code = ds.Tables[0].Rows[0]["return_code"].ToString(); if (!string.IsNullOrEmpty(wx_return_code)) { signstr += "&return_code=" + wx_return_code; } } //wx_sign if (ds.Tables[0].Columns.Contains("sign")) { wx_sign = ds.Tables[0].Rows[0]["sign"].ToString(); //if (!string.IsNullOrEmpty(wx_sign)) //{ // signstr += "&sign=" + wx_sign; //} } //wx_time_end if (ds.Tables[0].Columns.Contains("time_end")) { wx_time_end = ds.Tables[0].Rows[0]["time_end"].ToString(); if (!string.IsNullOrEmpty(wx_time_end)) { signstr += "&time_end=" + wx_time_end; } } //wx_total_fee if (ds.Tables[0].Columns.Contains("total_fee")) { wx_total_fee = Convert.ToInt32(ds.Tables[0].Rows[0]["total_fee"].ToString()); signstr += "&total_fee=" + wx_total_fee; } //wx_trade_type if (ds.Tables[0].Columns.Contains("trade_type")) { wx_trade_type = ds.Tables[0].Rows[0]["trade_type"].ToString(); if (!string.IsNullOrEmpty(wx_trade_type)) { signstr += "&trade_type=" + wx_trade_type; } } //wx_transaction_id if (ds.Tables[0].Columns.Contains("transaction_id")) { wx_transaction_id = ds.Tables[0].Rows[0]["transaction_id"].ToString(); if (!string.IsNullOrEmpty(wx_transaction_id)) { signstr += "&transaction_id=" + wx_transaction_id; } } #endregion //追加key 密钥 signstr += "&key=" + System.Web.Configuration.WebConfigurationManager.AppSettings["key"].ToString(); //签名正确 string orderStrwhere = "ordernumber='" + wx_out_trade_no + "'"; if (wx_sign == System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(signstr, "MD5").ToUpper()) { //签名正确 处理订单操作逻辑 } else { //追加备注信息 } } else { // 返回信息，如非空，为错误原因 签名失败 参数格式校验错误 string return_msg = ds.Tables[0].Rows[0]["return_msg"].ToString(); } return_result = sb.ToString(); } } public bool IsReusable { get { return false; } } //获得Post过来的数据 public string getPostStr() { Int32 intLen = Convert.ToInt32(System.Web.HttpContext.Current.Request.InputStream.Length); byte[] b = new byte[intLen]; System.Web.HttpContext.Current.Request.InputStream.Read(b, 0, intLen); return System.Text.Encoding.UTF8.GetString(b); } }