How does WeChat Mini Programs use C# to realize the payment function

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The specific code is as follows

Using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Web;using System.Web.Mvc;using System.IO;using System.Security.Cryptography;using System.Text;using System.Xml;using Newtonsoft.Json;using Newtonsoft.Json.Linq;namespace Mvc_vue.Controllers {public class wxController: Controller {/ GET: / wx/ public ActionResult Index () {return View () } / / required value public static string _ appid = "wxd930ea5d5a258f4f"; public static string _ mch_id = "10000100"; public static string _ key = "192006250b4c09247ec02edce69f6a2d" / / simulate wx to issue a unified order openid (front desk acquisition) public string getda (string openid) {return Getprepay_id (_ appid, "shanghaifendian", "monixiaofei", _ mch_id, GetRandomString (30), "http://www.weixin.qq.com/wxpay/pay.php", openid, getRandomTime (), 1) } / / Wechat issued an order to get prepay_id & return data private static string Getprepay_id (string appid, string attach, string body, string mch_id, string nonce_str, string notify_url, string openid, string bookingNo, int total_fee) {var url = "https://api.mch.weixin.qq.com/pay/unifiedorder";" by signing again. / / Wechat Unified order request address string strA = "appid=" + appid + "& attach=" + attach + "& body=" + body + "& mch_id=" + mch_id + "& nonce_str=" + nonce_str + "& notify_url=" + notify_url + "& openid=" + openid + "& out_trade_no=" + bookingNo + "& spbill_create_ip=61.50.221.43&total_fee=" + total_fee + "& trade_type=JSAPI" String strk = strA + "& key=" + _ key; / / key key set for merchant platform key (fake) string strMD5 = MD5 (strk). ToUpper (); / / MD5 signature / / string strHash=HmacSHA256 ("sha256", strmd5). ToUpper (); / / only one signature method is required (MD5 or HmacSHA256 [pay documents to read carefully]) / / signature var formData = "; formData + =" + appid + " / / appid formData + = "" + attach + ""; / / additional data (description) formData + = "" + body + ""; / / Product description formData + = "" + mch_id + ""; / / merchant number formData + = "" + nonce_str + ""; / / Random string, no longer than 32 bits. FormData + = "" + notify_url + ""; / / Notification address formData + = "" + openid + ""; / / openid formData + = "" + bookingNo + ""; / / Merchant order number-pending formData + = "61.50.221.43"; / / Terminal IP-user ip formData + = "+ total_fee +"; / / payment amount unit is (cent) formData + = "JSAPI" / / transaction type (JSAPI-- official account payment) formData + = "" + strMD5 + "; / signature formData + ="; / / request data var getdata = sendPost (url, formData); / / get xml data XmlDocument doc = new XmlDocument (); doc.LoadXml (getdata); / / xml format to json string json = Newtonsoft.Json.JsonConvert.SerializeXmlNode (doc) JObject jo = (JObject) JsonConvert.DeserializeObject (json); string prepay_id = jo ["xml"] ["prepay_id"] ["# cdata-section"] .ToString (); / / timestamp string _ time = getTime () .ToString () / / return data to Mini Program string strB = "appId=" + appid + "& nonceStr=" + nonce_str + "& package=prepay_id=" + prepay_id + "& signType=MD5&timeStamp=" + _ time + "& key=" _ key; wx w = new wx (); w.timeStamp = _ time; w.nonceStr = nonce_str; w.package = "prepay_id=" + prepay_id; w.paySign = MD5 (strB). ToUpper () ; w.signType = "MD5"; / / send json data return JsonConvert.SerializeObject (w) to Mini Program;} / generate random string / string length / private static string GetRandomString (int length) {const string key = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789"; if (length

< 1) return string.Empty; Random rnd = new Random(); byte[] buffer = new byte[8]; ulong bit = 31; ulong result = 0; int index = 0; StringBuilder sb = new StringBuilder((length / 5 + 1) * 5); while (sb.Length < length) { rnd.NextBytes(buffer); buffer[5] = buffer[6] = buffer[7] = 0x00; result = BitConverter.ToUInt64(buffer, 0); while (result >

0 & & sb.Length

< length) { index = (int)(bit & result); sb.Append(key[index]); result = result >

> 5;}} return sb.ToString ();} / private static long getTime () {TimeSpan cha = (DateTime.Now-TimeZone.CurrentTimeZone.ToLocalTime (new System.DateTime (1970, 1, 1); long t = (long) cha.TotalSeconds; return t } / MD5 signature method / private static string MD5 (string inputText) {MD5 md5 = new MD5CryptoServiceProvider (); byte [] fromData = System.Text.Encoding.UTF8.GetBytes (inputText); byte [] targetData = md5.ComputeHash (fromData); string byte2String = null; for (int I = 0; I < targetData.Length) Byte2String +) {secret + = targetdata [I] .ToString ("x2");} return byte2String;} / HMAC-SHA256 signature method / private static string HmacSHA256 (string message, string secret) {secret = secret? "; var encoding = new System.Text.UTF8Encoding () Byte [] keyByte = encoding.GetBytes (secret); byte [] messageBytes = encoding.GetBytes (message); using (var hmacsha256 = new HMACSHA256 (keyByte)) {byte [] hashmessage = hmacsha256.ComputeHash (messageBytes); return Convert.ToBase64String (hashmessage) }} / wx Unified order request data / request address / / Parameter / private static string sendPost (string URL, string urlArgs) {/ / context.Request ["args"] System.Net.WebClient wCient = new System.Net.WebClient () WCient.Headers.Add ("Content-Type", "application/x-www-form-urlencoded"); byte [] postData = System.Text.Encoding.ASCII.GetBytes ("body=" + urlArgs); byte [] responseData = wCient.UploadData (URL, "POST", postData); string returnStr = System.Text.Encoding.UTF8.GetString (responseData); / / return accepted data return returnStr / / generate order number / private static string getRandomTime () {Random rd = new Random (); / / used to generate random number string DateStr = DateTime.Now.ToString ("yyyyMMddHHmmssMM"); / / date string str = DateStr + rd.Next (10000). ToString (). PadLeft (4,'0'); / / Random number return str with date }}}

Using MVC .NET Framework4

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