c# 小程序微信支付

//获取商品价格
                decimal shop_money = Convert.ToDecimal(shop_info.Rows[0]["money"]);
                //获取商品名称
                string title = shop_info.Rows[0]["title"].ToString();
                //计算订单金额
                decimal money = shop_money * Convert.ToDecimal(shop_num);
                //获取当前时间的时间戳
                DateTime time = DateTime.Now;
                double set_time = TimeHelper.ConvertDateTimeToS(time);
                //获取商品id 
                int id = shop_id;
                //获取订单状态
                int pay_state = Convert.ToInt32(0);
                Random ran = new Random();
                //订单号
                string num = DateTime.Now.ToString("yyMMddHHmmssfff") + ran.Next(1000, 9999).ToString();
                //获取商品类型
                int shop_type = Convert.ToInt32(shop_info.Rows[0]["shop_type"]);
                //获取商品组合个数
                int gro_num = Convert.ToInt32(shop_info.Rows[0]["gro_num"]);
                //获取商品名称
                //添加订单信息

 /// <summary>
        /// 微信下单
        /// </summary>
        /// <param name="title">商品名称</param>
        /// <param name="num">订单号</param>
        /// <param name="money">订单金额</param>
        /// <param name="user_id">用户id</param>
        /// <returns></returns>
        public DataTable wechat_payment(string title, string num, decimal money, int user_id)
        {
            string signType = "";
            string nonceStr = "";
            string timeStamp = "";
            string package = "";
            string appId = "";
            string paySign = "";
            DataTable aa = new DataTable();//可以给表创建一个名字，tb
            try
            {
                //根据id查询用户openid
                BLL.wx_yxt_user wx_yxt_user = new BLL.wx_yxt_user();
                DataTable user_info = wx_yxt_user.get_user_info(user_id);
                string openid =user_info.Rows[0]["wx_openid"].ToString(); //;


                //附加数据
                var _attach = "支付";
                //商品描述
                var _body = title;
                //随机字符串
                random_number random = new random_number();
                var _nonce_str = random.Generate_nonce(15);
                //回调地址
                var _notify_url = wechatConfig.wx_asyn_call_url;
                //商户订单号
                var _out_trade_no = num;
                //终端IP
                var _spbill_create_ip = GetWebClientIp();
                //订单金额
                var _total_fee = Convert.ToDouble(money);//元为单位             
                var _trade_type = "JSAPI";//交易类型
                                          //设备号
                var _scene_info = $@"{{""h5_info"": {{""type"":""Wap"",""wap_url"": ""{_notify_url}"",""wap_name"": ""{_body}""}}}}";
                //交易起始时间
                var _time_start = DateTime.Now.ToString("yyyyMMddHHmmss");
                //交易结束时间
                var _time_expire = DateTime.Now.AddHours(1).ToString("yyyyMMddHHmmss");
                var sign_type = "MD5";
                //下单
                var pre_order_httpResult = UnifiedOrder(_appid, _attach, _body, _mch_id, _nonce_str, _notify_url, _out_trade_no, _spbill_create_ip, _total_fee,
                    _trade_type, _scene_info, _time_start, _time_expire, sign_type, openid);
                var pre_order_resultStr = XElement.Parse(pre_order_httpResult);
                var pre_order_result_code = pre_order_resultStr.Element("return_code").Value;
                var pre_order_result_msg = pre_order_resultStr.Element("return_msg").Value;

                aa.Columns.Add("signType", typeof(System.String));//类型是可以变换的，比如System.Int32,System.Double..
                aa.Columns.Add("nonce_str", typeof(System.String));
                aa.Columns.Add("timeStamp", typeof(System.String));
                aa.Columns.Add("package", typeof(System.String));
                aa.Columns.Add("appId", typeof(System.String));
                aa.Columns.Add("paySign", typeof(System.String));
                if (pre_order_result_code == "SUCCESS")
                {
                    signType = "MD5";
                    nonceStr = pre_order_resultStr.Element("nonce_str").Value;
                    ///秒
                    TimeSpan t = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
                    string ts = Convert.ToInt64(t.TotalSeconds).ToString();
                    timeStamp = ts;
                    package = pre_order_resultStr.Element("prepay_id").Value;
                    appId = pre_order_resultStr.Element("appid").Value;
                    var stringADict = new Dictionary<string, string>();
                    stringADict.Add("signType", signType);
                    stringADict.Add("nonceStr", nonceStr);
                    stringADict.Add("timeStamp", timeStamp);
                    stringADict.Add("package", "prepay_id=" + package);
                    stringADict.Add("appId", appId);
                    paySign = Sign(stringADict, _partnerKey);
                    DataRow row = aa.NewRow();
                    row["signType"] = signType;
                    row["nonce_str"] = nonceStr;
                    row["timeStamp"] = timeStamp;
                    row["package"] = package;
                    row["appId"] = appId;
                    row["paySign"] = paySign;
                    aa.Rows.Add(row);
                }
            }
            catch (Exception ex)
            {
                NLogHelper.Error("WeChatIndex", ex);
            }

            return aa;
        }

  /// <summary>
        /// 下单
        /// </summary>
        /// <param name="appid">公众账号ID</param>
        /// <param name="attach">附加数据，在查询API和支付通知中原样返回，该字段主要用于商户携带订单的自定义数据</param>
        /// <param name="body">String(32) 商品描述 商品或支付单简要描</param>
        /// <param name="mch_id">商户号</param>
        /// <param name="nonce_str">随机字符串</param>
        /// <param name="notify_url">接收微信支付异步通知回调地址,不可带参,与下面的Notify对应，开发者可自定义其他url地址 </param>
        /// <param name="out_trade_no">商户系统内部的订单号,32个字符内、可包含字母</param>
        /// <param name="spbill_create_ip">终端ip</param>
        /// <param name="total_fee">收钱总额  分为单位 前台传过来后需要处理成分</param>
        /// <param name="trade_type">交易类型H5支付的交易类型为MWEB</param>
        /// <param name="scene_info">场景信息 WAP网站应用{"h5_info": {"type":"Wap","wap_url": "https://pay.qq.com","wap_name": "腾讯充值"}}</param>
        /// <param name="time_start">交易起始时间</param>
        /// <param name="time_expire">交易结束时间</param>
        /// <returns></returns>
        static string UnifiedOrder(string appid, string attach, string body, string mch_id, string nonce_str, string notify_url, string out_trade_no,
            string spbill_create_ip, double total_fee, string trade_type, string scene_info, string time_start, string time_expire, string sign_type, string openid)
        {
            var pre_order_httpResult = "";
            try
            {
                var stringADict = new Dictionary<string, string>();
                stringADict.Add("appid", appid);
                stringADict.Add("attach", attach);
                stringADict.Add("body", body);
                stringADict.Add("mch_id", mch_id);
                stringADict.Add("nonce_str", nonce_str);
                stringADict.Add("notify_url", notify_url);
                stringADict.Add("out_trade_no", out_trade_no);
                stringADict.Add("openid", openid);
                stringADict.Add("spbill_create_ip", spbill_create_ip);
                stringADict.Add("total_fee", Math.Round(Convert.ToDecimal(total_fee) * 100, 0).ToString());//元转分
                stringADict.Add("trade_type", trade_type);
                stringADict.Add("scene_info", scene_info);
                stringADict.Add("time_start", time_start);
                stringADict.Add("time_expire", time_expire);
                stringADict.Add("sign_type", sign_type);
                var sign = Sign(stringADict, _partnerKey);//生成签名字符串  

                //组合xml内容
                StringBuilder strBuilder = new StringBuilder();
                strBuilder.Append("<xml>");
                strBuilder.Append($"<appid>{appid}</appid>");//公众号id  
                strBuilder.Append($"<attach>{attach}</attach>");//附加数据
                strBuilder.Append($"<body>{body}</body>");//商品描述
                strBuilder.Append($"<mch_id>{mch_id}</mch_id>");//商户号  
                strBuilder.Append($"<nonce_str>{nonce_str}</nonce_str>");//随机字符串  
                strBuilder.Append($"<notify_url>{notify_url}</notify_url>");//接收微信支付异步通知回调地址,不可带参,与下面的Notify对应，开发者可自定义其他url地址  
                strBuilder.Append($"<out_trade_no>{out_trade_no}</out_trade_no>");//商户系统内部的订单号,32个字符内、可包含字母   
                strBuilder.Append($"<openid>{openid}</openid>");
                strBuilder.Append($"<spbill_create_ip>{spbill_create_ip}</spbill_create_ip>");//终端ip  
                strBuilder.Append($"<total_fee>{Math.Round(Convert.ToDecimal(total_fee) * 100, 0).ToString()}</total_fee>");//收钱总额  分为单位 前台传过来后需要处理成分  
                strBuilder.Append($"<trade_type>{trade_type}</trade_type>");//交易类型H5支付的交易类型为MWEB  
                strBuilder.Append($"<scene_info>{scene_info}</scene_info>");
                strBuilder.Append($"<time_start>{time_start}</time_start>");//交易起始时间
                strBuilder.Append($"<time_expire>{time_expire}</time_expire>");//交易结束时间
                strBuilder.Append($"<sign>{sign}</sign>");
                strBuilder.Append($"<sign_type>{sign_type}</sign_type>");
                strBuilder.Append("</xml>");

                //var url = _pre_order_url + "/sandboxnew/pay/unifiedorder";//沙箱
                var url = "https://api.mch.weixin.qq.com/" + "pay/unifiedorder";
                pre_order_httpResult = HttpPostRequestXml(url, strBuilder);
            }
            catch (Exception ex)
            {
                NLogHelper.Error("UnifiedOrder", ex);
            }

            return pre_order_httpResult;
        }

 /// <summary>
        /// 发送post xml文件请求
        /// </summary>
        /// <param name="Url"></param>
        /// <param name="strBuilder"></param>
        /// <returns></returns>
        static string HttpPostRequestXml(string Url, StringBuilder strBuilder)
        {
            string result = string.Empty;
            try
            {
                string data = strBuilder.ToString();
                //进行utf-8编码
                var encoding = Encoding.GetEncoding("utf-8");
                byte[] buffer = encoding.GetBytes(data);
                //根据webURL创建HttpWebRequest对象
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
                request.Method = "post";
                //request.Headers.Add("charset:utf-8");            
                request.ContentLength = buffer.Length;
                request.ContentType = "text/xml";

                StreamWriter myWriter = null;
                try
                {
                    myWriter = new StreamWriter(request.GetRequestStream());
                    myWriter.Write(data);
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message);
                }
                finally
                {
                    myWriter.Close();
                }
                //读取服务器返回的信息
                HttpWebResponse objResponse = (HttpWebResponse)request.GetResponse();
                using (StreamReader sr = new StreamReader(objResponse.GetResponseStream()))
                {
                    result = sr.ReadToEnd();
                }
            }
            catch (Exception ex)
            {
                NLogHelper.Error("HttpPostRequestXml", ex);
            }

            return result;
        }

 /// <summary>  
        /// 获取终端IP地址  
        /// </summary>  
        /// <returns></returns>  
        public static string GetWebClientIp()
        {
            string userIP = "";
            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 simone 090805  
                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;
        }

 /// <summary>  
        /// 生成签名  
        /// 签名在线验证工具：  
        /// http://mch.weixin.qq.com/wiki/tools/signverify/  
        /// </summary>  
        /// <param name="stringADict">参与签名生成的参数列表</param>  
        /// <param name="partnerKey">商家私钥</param>  
        /// <returns></returns>  
        public static string Sign(IDictionary<string, string> stringADict, string partnerKey)
        {
            var sign = "";
            try
            {
                var sb = new StringBuilder();
                foreach (var sA in stringADict.OrderBy(x => x.Key))//参数名ASCII码从小到大排序（字典序）；  
                {
                    if (string.IsNullOrEmpty(sA.Value)) continue;//参数的值为空不参与签名；  
                    if (string.Compare(sA.Key, "sign", true) == 0) continue;    // 参数中为签名的项，不参加计算  
                    sb.Append(sA.Key).Append("=").Append(sA.Value).Append("&");
                }
                var string1 = sb.ToString();
                string1 = string1.Remove(string1.Length - 1, 1);
                sb.Append("key=").Append(partnerKey);//在stringA最后拼接上key=(API密钥的值)得到stringSignTemp字符串  
                var stringSignTemp = sb.ToString();
                // var sign = MD5Encrypt(stringSignTemp, "UTF-8").ToUpper();//对stringSignTemp进行MD5运算，再将得到的字符串所有字符转换为大写，得到sign值signValue。   
                sign = MD5Encrypt(stringSignTemp, "UTF-8").ToUpper();//对stringSignTemp进行MD5运算，再将得到的字符串所有字符转换为大写，得到sign值signValue。 
            }
            catch (Exception ex)
            {

                NLogHelper.Error("Sign", ex);
            }

            return sign;
        }

    /// <summary>
        /// 用MD5加密字符串
        /// </summary>
        /// <param name="password">待加密的字符串</param>
        /// <returns></returns>
        public static string MD5Encrypt(string password, string encoding)
        {
            MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
            byte[] data = md5Hasher.ComputeHash(Encoding.UTF8.GetBytes(password));

            StringBuilder sBuilder = new StringBuilder();
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }
            return sBuilder.ToString();
        }