微信小程序支付功能 C# .NET开发

湘水渔歌 發表於 2019-8-8 14:38:00

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
 
<pre><code class="hljs cs"> <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></code></pre>
支付后台xiadan.ashx
 
 
<pre><code class="hljs cs"><%@ 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.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;
}

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);
// }
// else
// {
// buffer.AppendFormat("{0}={1}", key, parameters);
// }
// 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KEY32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();
}

}</code></pre>
 
 
      微信返回信息接收后台页面notify_url.ashx
 
<pre><code class="hljs cs"><%@ 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;
 System.Web.HttpContext.Current.Request.InputStream.Read(b, 0, intLen);
 return System.Text.Encoding.UTF8.GetString(b);
}
}</code></pre> 
来源：https://www.cnblogs.com/ws-yizhiduxiu/p/11320994.html

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微信小程序支付功能 C# .NET开发